SNM-1000 1 MB

SNM-1000
Node Control Modem
Installation and Operation Manual
Part Number MN/SNM1000.OM
Revision 3
SNM-1000
Node Control Modem
Installation and Operation Manual
Comtech EF Data is an ISO 9001
Registered Company.
Part Number MN/SNM1000.OM
Revision 3
March 31, 2002
Copyright © Comtech EF Data, 2000. All rights reserved. Printed in the USA.
Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161
.
Network Customer Support
The Network Customer Support Plan identifies the steps to be followed in resolving the
Customer’s concern.
The resolution efforts will follow these levels of contact:
•
•
•
Level One Contact – Factory Authorized Service Center.
Level Two Contact – Comtech EF Data Customer Support.
Level Three Contact – Network Test and Field Support
Procedural Steps
Step
1
Procedure
The Customer raises a concern with the Level One Contact.
2
The Level One Contact will perform Hardware repairs and Network Operations
troubleshooting in accordance with the Comtech EF Data Service Center
agreement.
3
If the Level One Contact is unable to resolve the concern, then the Level One
Contact will inform the Level Two Contact of the concern in accordance with the
instructions found within the attached Comtech EF Data Customer Support
Department’s document.
4
The Level Two Contact will enter the concern into the Comtech EF Data database
and determine whether the concern is a Hardware concern or a Network
Operations concern
5
The Level Two Contact will interface with the Level One Contact and provide
the appropriate hardware support and enter all correspondence into the Comtech EF
Data database.
6
If the Level Two Contact determines that the concern is a Network Operations
concern, then the Level Two Contact will inform the Level Three Contact.
7
The Level Three Contact will interface with the Level One Contact and provide
the appropriate support and enter all correspondence into the Comtech EF Data
database.
8
If the Level Three Contact determines that there is a Hardware failure then the
Level Three Contact will inform the Level Two Contact. Go to Step 5.
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SNM-1000 Node Control Modem
Preface
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Customer
Yes
Midas Network is functioning
properly?
*Note: If equipment was purchased
directly from Comtech EFData (not
through a Factory Authorized
Service Center), then CEFD
Customer Support will be the initial
point of contact.
No
Level One Contact is notified
Authorized Factory Service
Center
Yes
Resolved by Hardware repair
or Network Operations
troubleshooting?
No
Level Two Contact is notified
CEFD Customer Support
Hardware or Network
Operations issue?
Hardware
CEFD Customer Support
provides HW support
Hardware
Network Operations
Level Three Contact is notified
CEFD Network Test and Field
Support
CEFD Network Test and Field
Support
provides Network Operations
support
Hardware or Network
Operations issue?
iii
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See the Comtech EF Data website at http://www.comtechefdata.com for contact information for a Factory
Authorized Service Center. Contact the Factory Authorized Service Center for:
•
•
Product support
Information on upgrading or returning a product
Contact the Comtech EF Data Customer Support Department for:
•
•
Product support or training
Information on upgrading or returning a product
A Customer Support representative may be reached at:
Comtech EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
480.333.2200 (Main Comtech EF Data Number)
480.333.4357 (Customer Support Desk)
480.333.2500 FAX
or, E-Mail can be sent to the Customer Support Department at:
[email protected]
1. To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or replacement:
2. Request a Return Material Authorization (RMA) number from the Comtech EF Data Customer
Support Department.
3. Be prepared to supply the Customer Support representative with the model number, serial number,
and a description of the problem.
4. To ensure that the product is not damaged during shipping, pack the product in its original shipping
carton/packaging.
5. Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.)
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Table of Contents
CHAPTER 1. INTRODUCTION...................................................................................... 1–1
1.1
Overview............................................................................................................................................................1–2
1.1.1
Additional Features....................................................................................................................................1–2
1.1.2
Mode of Operation.....................................................................................................................................1–3
1.2
Description ........................................................................................................................................................1–4
1.3
Options ..............................................................................................................................................................1–4
1.4
General Specifications......................................................................................................................................1–5
1.4.1
Environmental and Physical ......................................................................................................................1–6
1.4.2
DAC Specifications ...................................................................................................................................1–6
1.4.3
Burst Mode Specifications.........................................................................................................................1–7
1.4.4
Continuous Mode Specifications ...............................................................................................................1–7
1.5
Viterbi Performance with Noise, Closed Network.........................................................................................1–7
1.6
Typical Spectral Occupancy ............................................................................................................................1–8
1.7
Dimensional Envelope ......................................................................................................................................1–9
CHAPTER 2. INSTALLATION......................................................................................... 2–1
2.1
Unpacking .........................................................................................................................................................2–1
2.2
Installation ........................................................................................................................................................2–2
2.3
Rear Panel Connections ...................................................................................................................................2–4
2.3.1
EFBUS1/2 Port (J6)...................................................................................................................................2–5
2.3.2
Fault Connector and Pinouts (J7)...............................................................................................................2–6
2.3.3
User Port ....................................................................................................................................................2–7
2.3.4
Auxiliary 1 Connector and Pinouts (J9).....................................................................................................2–8
2.3.5
Alarms Connector and Pinouts (J10) .........................................................................................................2–9
2.3.6
AC Power ..................................................................................................................................................2–10
2.3.7
DC Power ..................................................................................................................................................2–10
2.3.8
TX IF Output Connector (CP1) .................................................................................................................2–11
2.3.9
RX IF Output Connector (CP2) .................................................................................................................2–11
2.3.10
External Reference (CP3)......................................................................................................................2–11
2.3.11
Ground Connector (GND).....................................................................................................................2–11
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CHAPTER 3. OPERATION.............................................................................................. 3–1
3.1
Front Panel........................................................................................................................................................3–1
3.1.1
LED Indicators...........................................................................................................................................3–2
3.1.2
Front Panel Keypad ...................................................................................................................................3–3
3.2
Menu System.....................................................................................................................................................3–4
3.3
Front Panel Menu.............................................................................................................................................3–5
3.4
OPENING SCREEN ........................................................................................................................................3–6
3.4.1
FUNCTIONAL SELECT:CONFIGURATION ........................................................................................3–6
3.4.1.1
CONFIGURATION:MODULATOR ...............................................................................................3–6
3.4.1.1.1
MODULATOR:TX-X ..................................................................................................................3–6
3.4.1.1.2
MODULATOR:TX-IF FREQUENCY.........................................................................................3–7
3.4.1.1.3
MODULATOR:TX-IF OUTPUT.................................................................................................3–7
3.4.1.1.4
MODULATOR:TX POWER LEVEL..........................................................................................3–7
3.4.1.1.5
MODULATOR:SCRAMBLER....................................................................................................3–8
3.4.1.1.6
MODULATOR:DIFF.ENCODER ...............................................................................................3–8
3.4.1.1.7
MODULATOR:CARRIER MODE..............................................................................................3–8
3.4.1.1.8
MODULATOR:MODEM REFERENCE.....................................................................................3–9
3.4.1.1.9
MODULATOR:RS ENCODER ...................................................................................................3–9
3.4.1.2
FUNCTIONAL SELECT:DEMODULATOR..................................................................................3–10
3.4.1.2.1
DEMODULATOR:ASSIGNED FILTERS ..................................................................................3–10
3.4.1.2.2
DEMODULATOR:RX-IF FREQUENCY ...................................................................................3–10
3.4.1.2.3
DEMODULATOR:DESCRAMBLER.........................................................................................3–11
3.4.1.2.4
DEMODULATOR:DIFF. DECODER.........................................................................................3–11
3.4.1.2.5
DEMODULATOR:RF LOOP BACK ..........................................................................................3–11
3.4.1.2.6
DEMODULATOR:IF LOOP BACK ...........................................................................................3–11
3.4.1.2.7
DEMODULATOR:BER THRESHOLD ......................................................................................3–12
3.4.1.2.8
DEMODULATOR:SWEEP CENTER.........................................................................................3–12
3.4.1.2.9
DEMODULATOR:SWEEP RANGE...........................................................................................3–12
3.4.1.2.10 DEMODULATOR:REACQUISITION........................................................................................3–13
3.4.1.2.11 DEMODULATOR:RS DECODER..............................................................................................3–13
3.4.1.3
CONFIGURATION:INTERFACE...................................................................................................3–14
3.4.1.3.1
INTERFACE:TX CLOCK SOURCE...........................................................................................3–14
3.4.1.3.2
INTERFACE:TX CLOCK PHASE..............................................................................................3–14
3.4.1.3.3
INTERFACE:EXT-CLK FREQ ...................................................................................................3–15
3.4.1.3.4
INTERFACE:BUFFER CLOCK..................................................................................................3–16
3.4.1.3.5
INTERFACE:RX CLOCK PHASE..............................................................................................3–16
3.4.1.3.6
INTERFACE:B-BAND LOOP BACK.........................................................................................3–17
3.4.1.3.7
INTERFACE:BUFFER SIZE.......................................................................................................3–18
3.4.1.3.8
INTERFACE:BUFFER CENTER................................................................................................3–18
3.4.1.3.9
INTERFACE:LOOP TIMING .....................................................................................................3–19
3.4.1.4
CONFIGURATION:SAVE ..............................................................................................................3–19
3.4.1.5
CONFIGURATION:RECALL .........................................................................................................3–19
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3.4.2
FUNCTIONAL SELECT:MONITOR.......................................................................................................3–20
3.4.2.1
MONITOR:RAW BER.....................................................................................................................3–20
3.4.2.2
MONITOR:CORRECTED BER ......................................................................................................3–20
3.4.2.3
MONITOR:EB/NO...........................................................................................................................3–21
3.4.2.4
MONITOR:RECEIVE SIGNAL ......................................................................................................3–21
3.4.2.5
MONITOR:SWEEP FREQUENCY .................................................................................................3–21
3.4.2.6
MONITOR:BUFFER FILL ..............................................................................................................3–21
3.4.3
FUNCTIONAL SELECT:FAULTS AND ALARMS ...............................................................................3–22
3.4.3.1
FAULTS AND ALARMS:MODULATOR......................................................................................3–23
3.4.3.2
FAULTS AND ALARMS:DEMODULATOR.................................................................................3–23
3.4.3.3
FAULTS AND ALARMS:TX INTERFACE ...................................................................................3–24
3.4.3.4
FAULTS AND ALARMS:RX INTERFACE...................................................................................3–25
3.4.3.5
FAULTS AND ALARMS:COMMON.............................................................................................3–26
3.4.4
FUNCTIONAL SELECT:STORED FAULTS AND ALARMS...............................................................3–27
3.4.4.1
STORED FAULTS AND ALARMS:MODULATOR .....................................................................3–28
3.4.4.2
STORED FAULTS AND ALARMS:DEMODULATOR ................................................................3–28
3.4.4.3
STORED FAULTS AND ALARMS:TX INTERFACE...................................................................3–29
3.4.4.4
STORED FAULTS AND ALARMS:RX INTERFACE ..................................................................3–29
3.4.4.5
STORED FAULTS AND ALARMS:COMMON ............................................................................3–30
3.4.4.6
STORED FAULTS AND ALARMS:UNAVAL SECONDS ...........................................................3–30
3.4.4.7
STORED FAULTS AND ALARMS:CLEAR..................................................................................3–30
3.4.5
FUNCTIONAL SELECT:UTILITY .........................................................................................................3–31
3.4.5.1
UTILITY:MODULATOR ................................................................................................................3–32
3.4.5.1.1
MODULATOR:ASSIGN TRANSMIT FILTERS .......................................................................3–32
3.4.5.1.2
MODULATOR:MOD POWER OFFSET ....................................................................................3–32
3.4.5.1.3
MODULATOR:MODULATOR TYPE .......................................................................................3–33
3.4.5.1.4
MODULATOR:ENCODER TYPE..............................................................................................3–33
3.4.5.1.5
MODULATOR:TX BPSK ORDERING......................................................................................3–34
3.4.5.1.6
MODULATOR:MOD SPECTRUM ............................................................................................3–34
3.4.5.1.7
MODULATOR:TX-RS INTERLEAVE ......................................................................................3–34
3.4.5.1.8
MODULATOR:TX MODE..........................................................................................................3–34
3.4.5.1.9
MODULATOR:TX SYMBOL RATE .........................................................................................3–35
3.4.5.2
UTILITY:DEMODULATOR ...........................................................................................................3–35
3.4.5.2.1
DEMODULATOR:ASSIGN TRANSMIT FILTERS ..................................................................3–35
3.4.5.2.2
DEMODULATOR:DEMODULATOR TYPE.............................................................................3–36
3.4.5.2.3
DEMODULATOR:DECODER TYPE.........................................................................................3–36
3.4.5.2.4
DEMODULATOR:RX BPSK ORDERING ................................................................................3–37
3.4.5.2.5
DEMODULATOR:DEMOD SPECTRUM..................................................................................3–37
3.4.5.2.6
DEMODULATOR:RX-RS INTERLEAVE.................................................................................3–37
3.4.5.2.7
DEMODULATOR:RX MODE ....................................................................................................3–37
3.4.5.2.8
DEMODULATOR:RX SYMBOL RATE....................................................................................3–37
3.4.5.3
UTILITY:INTERFACE....................................................................................................................3–37
3.4.5.3.1
INTERFACE:TX OVERHEAD TYPE ........................................................................................3–37
3.4.5.3.2
INTERFACE:RX OVERHEAD TYPE........................................................................................3–38
3.4.5.3.3
INTERFACE:TX TERR INTERFACE........................................................................................3–38
3.4.5.3.4
INTERFACE:RX TERR INTERFACE........................................................................................3–38
3.4.5.3.5
INTERFACE:BUFFER PROGRAM ...........................................................................................3–38
3.4.5.3.6
INTERFACE:FRAMING STRUCTURE.....................................................................................3–40
3.4.5.3.7
INTERFACE:RTS TX-IF CNTRL...............................................................................................3–40
3.4.5.3.8
INTERFACE:TX DATA PHASE ................................................................................................3–40
3.4.5.3.9
INTERFACE:RX DATA PHASE ................................................................................................3–41
3.4.5.3.10 INTERFACE:CTS DELAY .........................................................................................................3–41
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3.4.5.4
UTILITY:NETWORK......................................................................................................................3–41
3.4.5.4.1
NETWORK:RELEASE................................................................................................................3–41
3.4.5.4.2
NETWORK:CHANNELS 1 - 15..................................................................................................3–42
3.4.5.4.3
NETWORK:CHANNELS 16 - 31................................................................................................3–42
3.4.5.5
UTILITY:SYSTEM ..........................................................................................................................3–42
3.4.5.5.1
SYSTEM:TIME/DATE................................................................................................................3–42
3.4.5.5.2
SYSTEM:REMOTE BAUD RATE .............................................................................................3–43
3.4.5.5.3
SYSTEM:REMOTE ADDRESS..................................................................................................3–43
3.4.5.5.4
SYSTEM:REMOTE TYPE ..........................................................................................................3–43
3.4.5.5.5
SYSTEM:OPERATION MODE ..................................................................................................3–44
3.4.5.5.6
SYSTEM:YEAR DISPLAY.........................................................................................................3–44
3.4.5.5.7
SYSTEM:TEST MODE STATUS ...............................................................................................3–44
3.4.5.5.8
SYSTEM:LAMP TEST................................................................................................................3–45
3.4.5.5.9
SYSTEM:SELF TEST..................................................................................................................3–45
3.4.5.5.10 SYSTEM:DISPLAY CONTRAST...............................................................................................3–45
3.4.5.5.11 SYSTEM:M&C FIRMWARE......................................................................................................3–45
3.4.5.5.12 SYSTEM:BOOT FIRMWARE ....................................................................................................3–46
3.4.5.5.13 SYSTEM:FPGA FIRMWARE.....................................................................................................3–46
3.4.5.5.14 SYSTEM:EXT AGC:MAX PWR ................................................................................................3–46
3.4.5.5.15 SYSTEM:EXT AGC:MIN PWR..................................................................................................3–47
3.4.5.5.16 SYSTEM:MASTER .....................................................................................................................3–47
3.4.5.6
UTILITY:MODEM TYPE................................................................................................................3–48
3.4.5.6.1
MODEM TYPE: MODEM TYPE................................................................................................3–48
3.4.5.6.2
MODEM TYPE: MODEM EMULATION ..................................................................................3–49
3.4.5.6.3
MODEM TYPE:REVISION EMULATION................................................................................3–49
3.4.5.6.4
MODEM TYPE:MODEM OPTIONS..........................................................................................3–50
3.4.5.6.5
MODEM TYPE:CARD #1 TYPE................................................................................................3–51
3.4.5.6.6
MODEM TYPE:CARD #2 TYPE................................................................................................3–51
3.4.5.6.7
MODEM TYPE:CARD #3 TYPE................................................................................................3–51
3.4.5.6.8
MODEM TYPE:LOCAL MODEM AUPC..................................................................................3–51
3.4.5.6.9
MODEM TYPE:MODEM SERIAL.............................................................................................3–51
3.4.5.6.10 MODEM TYPE:CONFIGURATION CODE - MODEM............................................................3–52
3.4.5.7
3.5
UTILITY:FACTORY SETUP ..........................................................................................................3–52
User Port Operation .........................................................................................................................................3–53
3.6
Remote Dial-Up Capability..............................................................................................................................3–54
3.6.1
User Port Modem.......................................................................................................................................3–54
3.6.2
Remote Site Modem ..................................................................................................................................3–54
3.7
SNM-1000 Commands .....................................................................................................................................3–55
3.7.1
Character Set..............................................................................................................................................3–55
3.7.2
Status Lines and Flow Control...................................................................................................................3–55
3.7.3
Message Structure......................................................................................................................................3–55
3.7.4
Node Address (NA) ...................................................................................................................................3–57
3.7.5
Receive Control Channel Frequency (ICF) ...............................................................................................3–58
3.7.6
Transmit Control Channel Frequency (OFC) ............................................................................................3–58
3.7.7
Transmitter On (RF_ON)...........................................................................................................................3–59
3.7.8
Transmitter Off (RF_OFF) ........................................................................................................................3–59
3.7.9
Transmit Power (TX).................................................................................................................................3–59
3.7.10
Current SNM-1000 DAC Software Revision (VER).................................................................................3–60
3.7.11
Node to NMS Service Messages (NMS_MSG).........................................................................................3–60
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3.7.12
3.7.13
3.7.14
3.7.15
3.7.16
3.7.17
3.7.18
3.7.19
3.7.20
3.7.21
3.7.22
3.7.23
3.7.24
3.7.25
3.7.26
3.7.27
3.7.28
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SNM-1000 Mode (MD) .............................................................................................................................3–61
Built-In Diagnostic Tests (EFD_DIAG) ....................................................................................................3–61
Echo (ECHO).............................................................................................................................................3–64
Setup Override (SETUP) ...........................................................................................................................3–64
Channel Type (CT) ....................................................................................................................................3–65
Modem Command Sequence (MC) ...........................................................................................................3–66
Data Call ....................................................................................................................................................3–67
Terminate (TE) ..........................................................................................................................................3–69
Initiate Multipoint Data Call (MI) .............................................................................................................3–70
Add Multipoint Data Circuit (MA)............................................................................................................3–72
Drop Multipoint Data Circuit (MT)...........................................................................................................3–73
Change Forward Channel for Multipoint Data Circuit (MF).....................................................................3–74
Change Return Channel for Multipoint Data Circuit (MR) .......................................................................3–75
Send Message to Multipoint Data Circuit Originator (MO) ......................................................................3–76
Send Message to Multipoint Data Circuit Listeners (ML).........................................................................3–77
Port Redirection .........................................................................................................................................3–77
Debugging with the User Port....................................................................................................................3–78
CHAPTER 4. THEORY OF OPERATION........................................................................ 4–1
4.1
Demand Assignment Controller (DAC)..........................................................................................................4–1
4.1.1
Specifications.............................................................................................................................................4–3
4.1.2
Theory of Operation ..................................................................................................................................4–3
4.1.3
EFBUS1/2 Port (External) .........................................................................................................................4–4
4.1.4
Monitor and Control ..................................................................................................................................4–4
4.1.5
Non-Volatile Memory................................................................................................................................4–5
4.1.6
User Port ....................................................................................................................................................4–5
4.1.7
M&C Theory of Operation ........................................................................................................................4–5
4.2
Modulator..........................................................................................................................................................4–6
4.2.1
Theory of Operation ..................................................................................................................................4–8
4.2.2
Theory of Modulation Types .....................................................................................................................4–9
4.2.3
Modulator Specifications...........................................................................................................................4–10
4.3
Demodulator .....................................................................................................................................................4–11
4.3.1
Theory of Operation ..................................................................................................................................4–12
4.3.2
Demodulator Specifications.......................................................................................................................4–12
CHAPTER 5. MAINTENANCE ........................................................................................ 5–1
5.1
Fault Isolation ...................................................................................................................................................5–1
5.1.1
System Faults/Alarms ................................................................................................................................5–2
5.1.2
Faults/Alarms Display ...............................................................................................................................5–6
5.1.3
Faults/Alarms Analysis..............................................................................................................................5–6
APPENDIX A. REMOTE CONTROL OPERATION .......................................................... A–1
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Figures
Figure 1-1.
Figure 1-2.
Figure 1-3.
Figure 1-4.
Figure 2-1.
Figure 2-2.
Figure 3-1.
Figure 3-2.
Figure 3-3.
Figure 3-4.
Figure 4-1.
Figure 4-2.
Figure 4-3.
Figure 5-1.
Figure 5-2.
Figure 5-3.
SNM-1000 Block Diagram .................................................................................................................1–2
Typical Installation..............................................................................................................................1–3
Typical Spectral Occupancy................................................................................................................1–9
SNM-1000 Dimensional Envelope .....................................................................................................1–10
Installation of the Mounting Bracket...................................................................................................2–3
SNM-1000 Rear Panel ........................................................................................................................2–5
SNM-1000 Front Panel View..............................................................................................................3–1
Keypad ................................................................................................................................................3–3
Main Menu ..........................................................................................................................................3–5
Baseband Loopback ............................................................................................................................3–17
DAC Block Diagram...........................................................................................................................4–2
Modulator Block Diagram ..................................................................................................................4–7
Demodulator Block Diagram ..............................................................................................................4–11
Typical Output Spectrum (with Noise) ...............................................................................................5–10
Typical Output Spectrum (Without Noise) .........................................................................................5–10
Typical Eye Constellations..................................................................................................................5–13
Tables
Table 1-1.
Table 1-2.
Table 1-3.
Table 1-4.
Table 1-5.
Table 2-1.
Table 2-2.
Table 2-3.
Table 2-4.
Table 2-5.
Table 3-1.
Table 4-1.
Table 4-2.
Table 5-1.
Table 5-2.
System Specifications...........................................................................................................................1–5
Environmental and Physical .................................................................................................................1–6
Burst Mode Operating Specifications...................................................................................................1–7
Continuous Mode Operating Specifications .........................................................................................1–7
Viterbi Performance .............................................................................................................................1–7
Rear Panel Connectors..........................................................................................................................2–4
Fault Connector and Pinouts (J7) .........................................................................................................2–6
SNM-1000 User Port Pinout and Signals .............................................................................................2–7
AUX 1 Connector and Pinouts (J9) ......................................................................................................2–8
Alarms Connector and Pinouts (J10) .....................................................................................................2–9
SNM-1000 Front Panel Indicators........................................................................................................3–2
Modulator Specifications......................................................................................................................4–10
Demodulator Specification ...................................................................................................................4–13
SNM-1000 Faul Tree............................................................................................................................5–3
Conversion to S/N and Eb/N0 ................................................................................................................5–9
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About this Manual
This manual describes the operation and maintenance of the Comtech EF Data
SNM-1000 Node Control Modem. This is a technical document intended for earth station
engineers, technicians, and operators responsible for the operation and maintenance of
the Comtech EF Data SNM-1000 Node Control Modem.
Related Documents
The following document is referenced in this manual:
•
Comtech EF Data Specification, SP/5747 DAMA Control Channel Messaging
Conventions and References
Cautions and Warnings
CAUTION
CAUTION indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. CAUTION may also be used to indicate other
unsafe practices or risks of property damage.
WARNING indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
WARNING
IMPORTANT indicates a statement that is associated with the task
being performed. .
IMPORTANT
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Metric Conversion
Metric conversion information is located on the inside back cover of this manual. This
information is provided to assist the operator in cross-referencing English to Metric
conversions.
Recommended Standard Designations
Recommended Standard (RS) Designations have been superseded by the new designation
of the Electronic Industries Association (EIA). References to the old designations are
shown only when depicting actual text displayed on the screen of the unit (RS-232, RS485, etc.). All other references in the manual will be shown with the EIA designations
(EIA-232, EIA-485, etc.) only.
Trademarks
Intel is a registered trademark of the Intel Corporation.
Sportster is a registered trademark of US Robotics Incorporated.
Product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies and are hereby acknowledged.
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual will be
appreciated. To submit comments, please contact the:
Comtech EF Data Technical Publications Department: [email protected]
Overview of Changes to Previous Revisions
xii
SNM-1000 Node Control Modem
Preface
Revision 3
MN/SNM1000.IOM
Electrical Safety
The SNM-1000 Modem has been shown to comply with the following safety standard:
•
EN 60950: Safety of Information Technology Equipment, including
electrical business machines
The equipment is rated for operation over the range 100 - 240 volts AC. It has a
maximum power consumption of 40 watts, and draws a maximum of 400 mA.
The user should observe the following instructions:
Fuses
The SNM-1000 is fitted with two fuses - one each for line and neutral connections. These
are contained within the body of the IEC power inlet connector, behind a small plastic
flap.
•
•
For 230 volt AC operation, use T0.75A, 20mm fuses.
For 115 volt AC operation, use T1.25A fuses, 20mm fuses.
FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES
WITH THE CORRECT TYPE AND RATING.
Environmental
The SNM-1000 must not be operated in an environment where the unit is exposed to
extremes of temperature outside the ambient range 0 to 50°C (32 to 122°F), precipitation,
condensation, or humid atmospheres above 95% RH, altitudes (un-pressurised) greater
than 2000 metres, excessive dust or vibration, flammable gases, corrosive or explosive
atmospheres.
Operation in vehicles or other transportable installations that are equipped to provide a
stable environment is permitted. If such vehicles do not provide a stable environment,
safety of the equipment to EN60950 may not be guaranteed.
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SNM-1000 Node Control Modem
Preface
Revision 3
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Installation
The installation and connection to the line supply must be made in compliance to local or
national wiring codes and regulations.
The SNM-1000 is designed for connection to a power system that has separate ground,
line and neutral conductors. The equipment is not designed for connection to power
system that has no direct connection to ground.
The SNM-1000 is shipped with a line inlet cable suitable for use in the country of
operation. If it is necessary to replace this cable, ensure the replacement has an equivalent
specification.
Examples of acceptable ratings for the cable include HAR, BASEC and HOXXX-X.
Examples of acceptable connector ratings include VDE, NF-USE, UL, CSA, OVE,
CEBEC, NEMKO, DEMKO, BS1636A, BSI, SETI, IMQ, KEMA-KEUR and SEV.
International Symbols:
Symbol
Definition
Symbol
Definition
~
Alternating Current
Protective Earth
Fuse
Chassis Ground
Telecommunications Terminal Equipment Directive
In accordance with the Telecommunications Terminal Equipment Directive 91/263/EEC,
this equipment should not be directly connected to the Public Telecommunications
Network.
xiv
SNM-1000 Node Control Modem
Preface
Revision 3
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EMC (Electromagnetic Compatibility)
In accordance with European Directive 89/336/EEC, the SNM-1000 Modem has been
shown, by independent testing, to comply with the following standards:
Emissions:
EN 55022 Class B - Limits and methods of measurement of radio
interference characteristics of Information Technology Equipment.
(Also tested to FCC Part 15 Class B)
Immunity:
EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,
commercial and light industrial environment.
Additionally, the SNM-1000 has been shown to comply with the following standards:
EN 61000-3-2
EN 61000-3-3
EN 61000-4-2
EN 61000-4-4
EN 61000-4-5
EN 61000-4-6
EN 61000-4-8
EN 61000-4-9
EN 61000-4-11
EN 61000-4-13
Harmonic Currents Emission
Voltage Fluctuations and Flicker
ESD Immunity
EFT Burst Immunity
Surge Immunity
RF Conducted Immunity
Power frequency Magnetic Field Immunity
Pulse Magnetic Field Immunity
Voltage Dips, Interruptions, and Variations Immunity
Immunity to Harmonics
In order that the Modem continues to comply with these standards, observe
the following instructions:
IMPORTANT
•
Connections to the transmit and receive IF ports (BNC female connectors) should
be made using a good quality coaxial cable - for example RG58/U (50 Ω or
RG59/U (75 Ω).
•
All 'D' type connectors attached to the rear panel must have back-shells that
provide continuous metallic shielding. Cable with a continuous outer shield
(either foil or braid, or both) must be used, and the shield must be bonded to the
back-shell.
•
The equipment must be operated with its cover on at all times. If it becomes
necessary to remove the cover, the user should ensure that the cover is correctly
re-fitted before normal operation commences
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SNM-1000 Node Control Modem
Preface
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European EMC Directive
In order to meet the European Electro-Magnetic Compatibility (EMC) Directive
(EN55022, EN50082-1), properly shielded cables for DATA I/O are required. More
specifically, these cables must be shielded from end-to-end, ensuring a continuous
ground shield.
The following information is applicable for the European Low Voltage Directive
(EN60950):
<HAR>
!
Type of power cord required for use in the European Community.
CAUTION: Double-pole/Neutral Fusing
ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung
International Symbols:
Alternating Current.
Fuse.
Safety Ground.
Chassis Ground.
Note: For additional symbols, refer to “Cautions and Warnings” listed earlier in this
preface.
xvi
SNM-1000 Node Control Modem
Preface
Revision 3
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Warranty Policy
This Comtech EF Data product is warranted against defects in material and workmanship
for a period of two year from the date of shipment. During the warranty period, Comtech
EF Data will, at its option, repair or replace products that prove to be defective.
For equipment under warranty, the customer is responsible for freight to Comtech EF
Data and all related custom, taxes, tariffs, insurance, etc. Comtech EF Data is responsible
for the freight charges only for return of the equipment from the factory to the customer.
Comtech EF Data will return the equipment by the same method (i.e., Air, Express,
Surface) as the equipment was sent to Comtech EF Data.
Limitations of Warranty
The foregoing warranty shall not apply to defects resulting from improper installation or
maintenance, abuse, unauthorized modification, or operation outside of environmental
specifications for the product, or, for damages that occur due to improper repackaging of
equipment for return to Comtech EF Data.
No other warranty is expressed or implied. Comtech EF Data specifically disclaims the
implied warranties of merchantability and fitness for particular purpose.
Exclusive Remedies
The remedies provided herein are the buyer's sole and exclusive remedies. Comtech EF
Data shall not be liable for any direct, indirect, special, incidental, or consequential
damages, whether based on contract, tort, or any other legal theory.
Disclaimer
Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-touse guide to your equipment. All statements, technical information, and
recommendations in this manual and in any guides or related documents are believed
reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and
they are not intended to be, nor should they be understood to be, representations or
warranties concerning the products described. Further, Comtech EF Data reserves the
right to make changes in the specifications of the products described in this manual at any
time without notice and without obligation to notify any person of such changes.
If you have any questions regarding your equipment or the information in this manual,
please contact the Comtech EF Data Customer Support Department.
xvii
SNM-1000 Node Control Modem
Preface
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xviii
Chapter 1. INTRODUCTION
This chapter provides an overview of the SNM-1000 Node Control modem, referred to in
this manual as “the node control modem” and “node controller.”
SNM-1000 Node
Control Modem
The node controller contains the following components:
Modem
The modem is a fully digital. Integrated satellite modem and Demand Assigned
Multiple Access (DAMA) controller. The modem is designed to function as
the traffic node controller within Comtech EF Data’s Bandwidth On-Demand
(BOD) Multimedia Integrated Digital Access System (MIDAS).
DAMA
DAMA control is provided by a DAMA Assignment Controller (DAC)
daughter board.
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SNM-1000 Node Control Modem
Introduction
1.1
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MN/SNM1000.IOM
Overview
The SNM-1000 Node Control Modem is a fully integrated digital satellite modem and
DAMA controller. Utilizing the latest digital signal processing techniques, it is designed
to function as a self-contained indoor unit that operates within Comtech EF Data's
Bandwidth-on-Demand (BOD) Multimedia Integrated Digital Access System (MIDAS).
1.1.1
Additional Features
The modem contains the following additional features:
•
Integrated DAMA controller in a 1RU package
•
Burst mode modulator
•
Continuous mode demodulator
•
Fast acquisition
•
Operational parameters stored in EEPROM
•
50/180 MHz operation
•
Software stored in flash for easy update
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SNM-1000 Node Control Modem
Introduction
1.1.2
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Mode of Operation
The SNM-1000 operates as a dedicated node controller at the HUB and REMOTE sites,
receiving the continuous outbound control channel from the hub station and transmitting
to the hub station on the inbound control channel in burst mode. The node control modem
manages traffic modems utilizing EFBUS1 connecting to the M&C port of the traffic
modems (Figure 1-1).
Figure 1-1. Typical Installation
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SNM-1000 Node Control Modem
Introduction
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Description
The SNM-1000 is housed in a 1-Rack Unit (1RU) rack-mountable chassis. Cooling is
provided by a fan mounted on the rear panel. The SNM-1000 operates in burst transmit
with continuous receive mode.
•
Burst mode is used by the SNM-1000 to transmit to the NMS over the inbound
control channel. The burst mode data rate is shown below.
Burst Mode Data Rates
19.2 kbit/s at FEC rate 1/2 QPSK
•
Continuous mode is used to receive the outbound control channel at the remote.
The continuous mode data rate is shown below.
Continuous Mode Data Rates
19.2 kbit/s Viterbi rate 1/2 QPSK
Figure 1-2. SNM-1000 Block Diagram
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SNM-1000 Node Control Modem
Introduction
1.3
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MN/SNM1000.IOM
Options
The following options are available for the SNM-1000:
Option
Part No.
90-264 VAC
KT/8000-3
-48 VDC
KT/8000-4
50Ω
PL/6093-3
75Ω
PL/6093-1
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SNM-1000 Node Control Modem
Introduction
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MN/SNM1000.IOM
Specifications
This section includes the following specifications:
•
•
•
•
•
•
1.4.1
General Specifications
Environmental and Physical Specifications
DAC
Burst mode operating specifications
Continuous mode operating specifications
Bit Error Rate (BER) specifications
General Specifications
Table 1-1. General Specifications
Parameter
Operating IF Range
Digital Data:
Burst Mode Transmit (Slotted Aloha)
TX Data Rate
Continuous Mode Receive
RX Data Rate
Symbol Rate
Modulation
Forward Error Correction
Data Scrambling
External Reference
Plesiochronous Buffer
Specification
50 to 180 MHz, in 1 Hz steps
TDMA
19.2 kbps
TDM
19.2 kbps
19.2 kHz
QPSK
Viterbi, K=7, 1/2 rate
IESS-308 (V.35), IESS-309, or None
1, 5, 10, 20 MHz
16 bits to 256 kbps, in 16 bit steps
2 to 98 ms, in 2 ms steps
Modulator
Output Power
Output Spurious
Output Harmonics
Output Spectrum
Output Return Loss
Output Impedance
Output Frequency Stability
Data Clock Source
-5 to –30 dBm, adjustable in 0.1 dB steps
< -55 dBc, 0 to 500 MHz (4 kHz in-band)
< -55 dBc, 0 to 500 MHz (4 kHz out-of-band)
Meets IESS-308/309 power spectral mask
> 20 dB
75 Ω (Optional: 50 Ω)
± 10 PPM
Internal or External
External Clock: ± 100 PPM and < 5% jitter
Internal Clock: ± 10 PPM
± 1 x 10-5
Internal Stability
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SNM-1000 Node Control Modem
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Table 1-1. General Specifications (Continued)
Demodulator
Input Power:
Desired Carrier
Maximum Composite
Input Impedance
Input Return Loss
Carrier Acquisition Range
Acquisition Time: 19.2 bps, R=1/2
Sweep Reacquisition
Data Clock
Outbound (from NMS)
-30 to –55 dBm
-5 dBm or +40 dBc
75Ω (Optional: 50Ω)
> 20 dB
± 35 kHz from 100 Hz to 35 kHz, in 1 Hz steps
< 2 seconds
0 to 999 seconds, in 1 second steps
Internal, External, Transmit, Recovered RX
Continuous transmission, Time Division Multiplex
(TDM), 19.2 kbps, QPSK, R=1/2
Burst transmission, (TDMA) Slotted Aloha,
19.2 kbps, QPSK, R=1/2
Inbound (to NMS)
Processor
M&C Processor
Single processor for node control EEPROM variable
storage Memory life without power for 10 years.
User Port Interface
Interface Type
Data Rate
Data Bits
Parity
Stop Bits
Application
EIA-232
19.2 kbps
8
None
1
Remote circuit initiation and termination via command
interface; Transmits and receives service terminal
messages.
Control Interface
EFBUS1:
Interface Type
Data Rate
Application
EIA-485
9.6 or 19.2 kbps
Multi-drop bus used to control external data traffic
modems
Standard Comtech EF Data remote commands
SDM-100, SDM-300/300A, SDM-2020M/D,
SDM-6000, SDM-8000, SDM-9000, CDM-550/550T,
CDM-600, CiM-550
Compatibility
Modems Supported
(Not limited to-)
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SNM-1000 Node Control Modem
Introduction
1.4.2
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Environmental and Physical
Table 1-2. Environmental and Physical
Parameter
Specification
90 to 264 VAC, 47 to 63 Hz
Optional: 38 to 64 VDC
30 Watt
1.75H x 19.0W x 14.0D inch (1 RU)
(4.4H x 48W x 36D cm)
< 11 lbs (< 5 kg)
Prime Power
Power Dissipation
Size
Weight
Temperature:
Operating
Storage
Humidity
Shipping Container Dimensions
0 to 50°C (32 to 122°F)
-55 to 70°C (-67 to 158°F)
Up to 95%, non-condensing
22W x 20D x 12H inches
(56W x 51D x 31H cm)
15 lbs (7 kg)
Shipping Weight
1.4.3
DAC Specification
The DAC performs all of the DAMA control functions. The DAC provides a set of
interface for communicating with an operator, controlling external traffic modems, etc.
The DAC communicates with the NMS for call control and M&C.
1.4.4
Burst Mode Specification
Table 1-3. Burst Mode Operating Specifications
Modulator Specifications
Operating Frequency Range
Type of Modulation
Operating Channel Spacing
Phase Noise
Digital Data Rate:
QPSK, 1/2 Rate
Forward Error Correction
Data Scrambling
50 to 180 MHz
QPSK
Less than 0.5 dB degradation operating with 2 adjacent-like
channels, each 10 dB higher at 1.3 times the symbol rate, or a
minimum of 1.2 times the specified acquisition range
In accordance with IESS-308
19.2 kbit/s
Convolution encoding, soft-decision K=7 Viterbi decoding
Selectable or none, 215-1, synchronous
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SNM-1000 Node Control Modem
Introduction
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Continuous Mode Specifications
Table 1-4. Continuous Mode Operating Specifications
Input Power (Desired Carrier)
Carrier Acquisition Range
Clock Acquisition Range
Acquisition Time
Directed Sweep:
Sweep Range
Sweep Center
1.4.6
Demodulator Specifications
-30 to -55 dBm (composite) +30 dB power within 2 MHz from
desired carrier
+40 dB power outside of 2 MHz from desired carrier
-5 dBm maximum composite
± 35 kHz
± 100 PPM
< 1 second at all data rates
0 to 70000 Hz
-35000 to +35000 Hz
Viterbi Performance with Noise, Closed Network
Table 1-5 lists the Viterbi decoder specifications with noise, closed network, for the Eb/N0
required to achieve 10-5 to 10-8 BER.
Table 1-5. Viterbi Performance
Eb/N0 (dB) Specification
BER
1/2 Rate
10-5
4.6
10-6
5.3
10-7
5.9
-8
10
6.4
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SNM-1000 Node Control Modem
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Typical Spectral Occupancy
Figure 1-3. Typical Spectral Occupancy
1-10
SNM-1000 Node Control Modem
Introduction
1.6
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MN/SNM1000.IOM
Dimensional Envelope
14.0
(36)
Figure 1-4. SNM-1000 Dimensional Envelope
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Introduction
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1-12
Chapter 2. INSTALLATION
This chapter provides unpacking and installation instructions, and a description of
external connections information.
CAUTION
2.1
The equipment contains parts and assemblies sensitive to damage by
Electrostatic Discharge (ESD). Use ESD precautionary procedures when
touching, removing, or inserting PCBs.
Unpacking
The modem and manual are packaged in pre-formed, reusable, cardboard cartons
containing foam spacing for maximum shipping protection.
Do not use any cutting tool that will extend more than 1 inch (2.54 cm) into
the container. This can cause damage to the modem.
CAUTION
Unpack the modem as follows:
1.
2.
3.
4.
5.
6.
7.
Cut the tape at the top of the carton indicated by OPEN THIS END.
Remove the cardboard/foam space covering the modem.
Remove the modem, manual, and power cord from the carton.
Save the packing material for storage or reshipment purposes.
Inspect the equipment for any possible damage incurred during shipment.
Check the equipment against the packing list to ensure the shipment is correct.
Refer to Section 2.2 for installation instructions.
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SNM-1000 Node Control Modem
Installation
2.2
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MN/SNM1000.IOM
Installation
The modem arrives fully assembled from the factory. After unpacking the modem, install
the modem as follows:
1. If required, install the mounting bracket in equipment rack (Figure 2-1). Install
and tighten the bracket bolts.
2. Loosen the screw with flat washer located on the left side of modem chassis.
Mount the modem chassis into the equipment rack and slide the screw with flat
washer through the slot of the mounting bracket. Tighten the screw sufficiently to
allow the modem chassis to slide in the bracket.
3. Connect the cables to the proper locations on the rear panel. Refer to Section 2.4
for connector pinouts, placement, and function.
4. Connect the primary power cable to the power source. Before turning on the
power switch, become familiar with the front panel operation in Chapter 3.
5. If problems exist with the installation, refer to Chapter 5 for troubleshooting
information.
2–2
SNM-1000 Node Control Modem
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Figure 2-1. Installation of the Mounting Bracket
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SNM-1000 Node Control Modem
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MN/SNM1000.IOM
Rear Panel Connections
The rear panel connectors provide all necessary external connections between the node
control modem and other equipment. Figure 2-1 provides a layout of the SNM-1000 rear
panel, and Table 2-1 lists these connectors.
USER
PORT
J6
EF BUS 1/2
RX/IF INPUT
EX REF
J9
AUX 1
FAULT
J7
ALARMS
J10
CP3
CP2
TX/IF OUTPUT
CP1
Figure 2-2. SNM-1000 Rear Panel
Table 2-1. Rear Panel Connectors
Connection
GROUND CONNECTOR
AC POWER
USER PORT
EFBUS1/2
AUXILIARY 1
FAULT
ALARM
OUTPUT
EXTERNAL
REFERENCE
RX IF INPUT
CONNECTOR
TX IF OUTPUT
CONNECTOR
Description
The GROUND CONNECTOR (GRN), provides a common chassis ground
connection among all of the equipment, via a #10-32 stud.
The AC POWER accepts input power for the SNM-1000. (+48 VDC optional)
The USER PORT allows the user to configure setup parameters, and to
initiate/terminate remotely initiated calls.
The EFBUS1/2 in used by the Node Control Modem to control up to 30 Comtech
EF Data/MIDAS modems.
The AUXILIARY 1 connector (J9), provides MOD and DEMOD (TTL) faults,
satellite clock, satellite I&Q, and Automatic Gain Control (AGC) output voltage.
The FAULT connector (J7), provides Form C contact closures for fault reporting.
Not currently used.
The ALARM OUTPUT (J10), provides FORM C contact closures for the purpose
of fault reporting.
The EXTERNAL REFERENCE (CP3), is a BNC connector for an external
reference. The input impedance is 75Ω
The RX IF INPUT CONNECTOR (CP2), is a BNC jack that provides a
connection for the receive IF signal.
The TX IF OUTPUT CONNECTOR (CP1), is a BNC jack that provides a
connection for the transmit IF signal.
Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded
cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a
continuous ground shield.
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SNM-1000 Node Control Modem
Installation
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MN/SNM1000.IOM
EFBUS1/2 Port (J6)
The EFBUS port provides two separate 2-wire EIA-485 interfaces wired to a common
9-pin D female connector located on the rear of the MIDAS Node Control Modem. The
IF Modulator and IF Demodulator status is also presented for external use.
The Modem Control serial port, EFBUS1, is used for control of other Comtech EF Data
traffic modems. The signals are described in the following table, with signal names
having the MC prefix. The interface is ASYNC, EIA-485/2 wire, and 19.2 kbps.
The EFBUS2 port is reserved for communication with future MIDAS traffic modems.
Signal Function
Ground
Demodulator fault
Modulator fault
Receive/Transmit +
Receive/Transmit Receive/Transmit+
Receive/TransmitGround
Not used
Not used
Name
MCGND
BP_DF
BP_MF
MS_RD/SD+(EFBUS2)
MS_RD/SD-(EFBUS2)
MC_RD/SD+(EFBUS1)
MC_RD/SD-(EFBUS1)
MSGND
-
2–5
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
MIDAS
Conn Pin #
1
2
3
4
5
6
7
8
9
-
Signal
Level
TTL
TTL
EIA-485
EIA-485
EIA-485
EIA-485
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SNM-1000 Node Control Modem
Installation
2.3.2
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Fault Connector and Pinouts (J7)
The fault connector provides Form C contact closures for fault reporting. The three Form C
summary fault contacts, ratings 1A maximum at 24 VDC, 0.5A at 120 VAC, are
Modulator, Demodulator, and Common Equipment.
The fault interface connection is a 9-pin subminiature female D connector (J7) located on
the rear panel of the modem. Screw locks are provided for mechanical security on the
mating connector. Refer to Table 2-2 for pinout information.
Table 2-2. Fault Connector and Pinouts (J7)
Pin #
1
2
3
4
5
6
7
8
9
Signal Function
Common equipment is not faulted
Common equipment is faulted
Modulator is not faulted
Modulator is faulted
Demodulator is not faulted
Demodulator is faulted
Name
NO
COM
NC
NO
COM
NC
NO
COM
NC
Note: A connection between the common (COM) and normally open (NO)
contacts indicates no fault.
Refer to Chapter 5 for a discussion of monitored faults. To obtain a system summary
fault, connect all the Form C contacts in parallel.
2–6
SNM-1000 Node Control Modem
Installation
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User Port
The User Port provides for serial communications with the modem to allow configuration
of setup parameters and user requests for traffic channel assignments. The interface is
provided on a 9-pin MINI-DIN female connector (DCE) located on the rear panel of the
SNM-1000. Refer to the following listing for User Port specifications.
Connector Type
Signal Type
Rate
9-pin MINI-DIN
EIA-232
19.2 kbit/s, 8 bits-no parity-1stop
Note: Refer to Appendix A for a description of the software communications parameters
and for detailed message format information.
Pinout and signal levels are described in Table 2-3.
Table 2-3. SNM-1000 User Port Pinout and Signals
Signal Function
Receiver Ready
Receive Data
Send Data
Terminal Ready
Signal Ground
Data Mode
Request to Send
Clear to Send
Incoming Call
Name
RR
RD
SD
TR
SG
DM
RS
CS
IC
Pin #
1
2
3
4
5
6
7
8
9
2–7
I/O
O
O
I
I
Signal Level
EIA-232
EIA-232
EIA-232
EIA-232
O
I
O
O
EIA-232
EIA-232
EIA-232
EIA-232
SNM-1000 Node Control Modem
Installation
2.3.4
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Auxiliary 1 Connector and Pinouts (J9)
The auxiliary 1 (AUX 1) connector provides:
•
•
•
•
MOD and DEMOD (TTL) faults
Satellite clock
Satellite I&Q
Automatic Gain Control (AGC) output voltage
The faults are open collector levels that indicate a modulator or demodulator failure. A logic
“1” indicates the faulted condition.
AGC_OUT is a programmable voltage, 0 to 10V, for a receive signal level between -25 and
-60 dBm.
AUX 1 connection is a 9-pin female D connector (J9) located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector. Refer to
Table 2-4 for pinout information
Table 2-4. AUX 1 Connector and Pinouts (J9)
Pin #
1
2
3
4
5
6
7
8
9
Signal Function
Satellite Clock No Connection
Satellite Clock +
MODULATOR TTL Fault
Ground
RX Q Channel Eye
DEMODULATOR TTL Fault
RX 1 Channel Eye
Agc Output
2–8
Name
SAT_CLKNC
SAT_CLK+
MDFLTTTL
GRN
RX_Q
DFFLTTTL
Rx_1
AGC
SNM-1000 Node Control Modem
Installation
2.3.5
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Alarms Connector and Pinouts (J10)
The alarms connector provides Form C contact closures for alarm reporting. The two Form
C summary fault contacts are Modulator and Demodulator.
The alarms connection is a 9-pin female D connector (J10) located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector. Refer to
Table 2-5 for pinout information.
Table 2-5. Alarms Connector and Pinouts (J10)
Pin #
1
2
3
4
5
6
7
8
9
•
•
•
Signal Function
Alarm 1 is faulted
Alarm 1 is not faulted
Alarm 2 is faulted
Alarm 2 is not faulted
Alarm 3 is faulted
Alarm 3 is not faulted
Alarm 1 = Not used
Alarm 2 = TX
Alarm 3 = RX
2–9
Name
NO
COM
NC
NO
COM
NC
NO
COM
NC
SNM-1000 Node Control Modem
Installation
2.3.6
Revision 3
MN/SNM1000.IOM
AC Power
The AC power is supplied to the SNM-1000 by a standard, detachable, non-locking,
3-prong power cord. Refer to the following listing for AC power specifications.
2.3.7
Input power
Input voltage
50W max.
90 to 264 VAC, 47 to 63Hz.
Connector type
Fuse protection
Note: Unit switches ranges automatically.
IEC
1A slo-blo line and neutral fusing 5 mm type fuses.
DC Power
For DC supplied units, the DC Power is supplied by terminal lugs installed on the back
panel. Refer to the following table for specifications
Input power
Input voltage
Connector type
Fuse protection
2.3.8
50W max.
38 to 64 VDC.
Terminal Lug
1A slo-blo 5 mm type fuses.
TX IF Output Connector (CP1)
CP1 is a BNC connector for the transmit IF signal. The standard output impedance is
75Ω (50 Ω optional ), and the output power level is -5 to -30 dBm. In normal operation, the
output will be a 8PSK, QPSK/OQPSK, or BPSK-modulated result of the data connector
between 50 and 180 MHz, in 1 Hz steps.
2.3.9
RX IF Input Connector (CP2)
CP2 is a BNC connector for the RX-IF signal. The standard input impedance is
75Ω (50Ω optional). For normal operation, the desired carrier signal level should be
between -30 and -55 dBm. Signals between 50 and 180 MHz are selected and demodulated
to produce clock and data.
2.3.10
External Reference (CP3)
CP3 is a BNC connector for an EX REF. The input impedance is 75Ω.For normal
operation, the reference signal is ≥ 0 dBm.
2.3.11
Ground Connector (GND)
A #10-32 stud on the rear panel of the modem is used for connecting a common chassis
ground among all equipment. The AC power connector provides the safety ground.
2–10
Chapter 3. OPERATION
This chapter describes the operation of the SNM-1000.
3.1
Front Panel
The front panel of the SNM-1000 (Figure 3-1) provides for monitoring modem
configuration and status.
EF BUS 1
S
M
N
NMS
POWER
P
OWER ON
EF BUS 2
E
D
O
N
NODE
TRANSMITTER
T
RANSMITTER ON
H
C
L
E
N
A
CHANNEL
CARRIER
C
ARRIER DETECT
ENTER
CLEAR
SNM-1010 Data
SNM-1000
Data Control
ControlModem
Modem
FAULT
T
L
U
A
F
EST MODE
TEST
Figure 3-1. SNM-1000 Front Panel View
The front panel features include:
•
•
•
32- character, two-line LCD display
Six-button keypad for local control
Eight LED's to provide overall status at a glance
These functions are accessible at the front panel by entering on of five pre-defined
function select categories or levels:
•
•
•
•
•
Configuration
Monitor
Faults/Alarms
Stored Faults/Alarms
Utility
3–1
SNM-1000 Node Control Modem
Operation
3.1.1
Revision 3
MN/SNM1000.IOM
LED Indicators
In addition to the LCD, the LED’s provides the modem status. The DAC board controls
LEDs 6 through 10. The LED’s support three states:
•
•
•
ON
OFF
Flashing
Table 3-1. SNM-1000 Front Panel Indicators
LED
POWER ON
FAULT
TEST MODE
TRANSMITTER ON
Color
Green
Red
Yellow
Green
CARRIER DETECT
NODE
Green
Green
NMS
Green
CHANNEL
EFBUS1
Green
Green
EFBUS2
Green
Description
Power is applied to the modem.
A fault condition exists.
Flashes when the unit is in a test configuration.
Transmitter is currently ON.
Indicates the actual condition of the transmitter, as opposed to the
programmed condition.
In control mode, the indicator blinks since the transmitter is operating in
the burst mode.
In traffic mode, the indicator is solid green.
Decoder is locked.
Indicates the node has been enabled or disabled by the NMS. It is ON
if the node is enabled, OFF if the node is disabled.
(OFF) Node did not receive timing or ACKNOWLEDGE messages
from the NMS.
(FLASHING) Node received timing message from the NMS, but no
ACKNOWLEDGE message was received.
(ON) Node received timing and ACKNOWLEDGE from the NMS.
(OFF) Not used on SNM-1000.
(OFF) Indicates operational status of externally connected traffic
modems.
(ON) OK
(FLASHING) Fault indication.
(OFF) Indicates operational status of externally connected traffic
modems.
(ON) OK
(FLASHING) Fault indication.
3–2
SNM-1000 Node Control Modem
Operation
3.1.2
Revision 3
MN/SNM1000.IOM
Front Panel Keypad
The front panel keypad operates in monitor mode only, and permits local operation of the
modem. The keypad consists of six keys (Figure 3-2).
ENTER
CLEAR
Figure 3-2. Keypad
Each key provides one or more logical functions. These functions are defined in the
following table.
ENTER
Left and Right
Diamond Keys
This key is used to select a displayed function or to execute a modem
configuration change.
This key is used to back out of a selection or to cancel a configuration change
which has not been executed using [ENTER]. Pressing [CLEAR] generally returns
the display to the previous selection.
These keys are used to move to the next selection or to move the cursor for certain
functions.
Top and Bottom
Diamond Keys
Note: Throughout this chapter, [←] and [→] are used to indicate left and right
diamond keys.
These keys are used primarily to change configuration data (numbers). At times,
they are also used to move from one section to another.
CLEAR
Note: Throughout this chapter, [↑] and [↓] are used to indicate top and bottom
diamond keys.
The modem responds by beeping whenever a key is pressed:
•
A single beep indicates a valid entry and the appropriate action was taken.
•
A double beep indicates an invalid entry or a parameter is not available for
operation.
3–3
SNM-1000 Node Control Modem
Operation
3.2
Revision 3
MN/SNM1000.IOM
Menu System
Use the Main menu in Figure 3-3 as a quick reference for accessing the modem functions.
When the modem power is applied, the base level of the menu system displays the
sign-on message:
•
•
Line 1 of the sign-on message is the modem type.
Line 2 is the node address.
The main level of the menu system is Function Select. To access this level from the
sign-on message, press the [←] or [→] keys. From the Function Select menu, select one
of the functional categories:
•
•
•
•
•
Configuration
Monitor
Faults/Alarms
Stored Faults/Alarms
Utility
Press [←] or [→] to move from one selection to another. When line 2 displays the desired
function, select that level by pressing [ENTER]. After entering the appropriate functional
level, press [←] or [→] to move to the desired function.
To view the modem’s configuration, enter the Configuration level from the Function
Select menu. Once in the Configuration menu, press [←] or [→] to scroll through the
Configuration menu selection:
•
•
•
•
•
Modulator
Demodulator
Interface
Save
Recall
Press [ENTER] to select the desired Configuration menu option. To view the options for
the selected configuration parameters, press [←] or [→].
Notes:
1. Menus or commands that are specific to certain modem configurations are only
accessible after selecting the appropriate modem configuration. This prevents
incompatible parameters from accidentally being selected.
3. All of the windows are accessible in the Custom mode. Take caution not to select
incompatible parameters, as the modem does not shut out incompatible command
choices in the Custom mode.
3–4
SNM-1000 Node Control Modem
Operation
3.3
Revision 3
MN/SNM1000.IOM
Front Panel Menu
SELECT
CONFIGURATION
MONITOR
FAULTS/ALARMS
STORED FLTS/ALMS
UTILITY
ASSIGNED TRANSMIT FILTERS
TX-IF FREQUENCY
TX-IF OUTPUT
TX POWER LEVEL
SCRAMBLER
DIFF ENCODER
CARRIER MODE
MODEM REFERENCE
MODULATOR
DEMODULATOR
INTERFACE
SAVE
RECALL
RAW BER
CORRECTED BER
EB/NO
RECEIVE SIGNAL
SWEEP FREQUENCY
BUFFER FILL
ASSIGNED RECEIVE FREQUENCY
RX-IF FREQUENCY
DESCRAMBLER
DIFF DECODER
RF LOOP BACK
IF LOOP BACK
BER THRESHOLD
SWEEP CENTER
SWEEP RANGE
REACQUISITION
MODULATOR
DEMODULATOR
TX INTERFACE
RX INTERFACE
COMMON
MODULATOR
DEMODULATOR
TX INTERFACE
RX INTERFACE
COMMON
UNAVAILABLE SECONDS
CLEAR
TX CLOCK SOURCE
TX CLOCK PHASE
EXT-CLK FREQ
BUFFER CLOCK
RX CLOCK PHASE
B-BAND LOOP BACK
BUFFER SIZE
BUFFER CENTER
LOOP TIMING
MODULATOR
DEMODULATOR
INTERFACE
NETWORK
SYSTEM
MODEM TYPE
ASSIGNED TRANSMIT FILTERS
MOD POWER OFFSET
MODULATOR TYPE
ENCODER TYPE
TX BPSK OREDERING
MOD SPECTRUM
TX MODE
TX SYMBOL RATE
FACTORY SETUP (NOT APPLICABLE)
ASSIGNED RECEIVE FILTERS
DEMODULATOR TYPE
DECODER TYPE
RX BPSK ORDERING
DEMOD SPECTRUM
RX MODE
RX SYMBOL RATE
TX OVERHEAD TYPE
RX OVERHEAD TYPE
TX TERR INTERFACE
RX TERR INTERFACE
BUFFER PROGRAM
FRAMING STRUCTURE
RTS TX-IF CNTRL
TX DATA PHASE
RX DATA PHASE
CTS DELAY
RELEASE
CHANNELS 1-15
CHANNELS 16-31
TIME/DATE
REMOTE BAUD RATE
REMOTE ADDRESS
REMOTE TYPE
OPERATION MODE
YEAR DISPLAY
TEST MODE STATUS
LAMP TEST
SELF TEST
DISPLAY CONTRAST
M&C FIRMWARE
BOOT FIRMWARE
FPGA FIRMWARE
EXT AGC: MAX PWR
EXT AGC: MIN PWR
MASTER RESET
MODEM TYPE
MODEM EMULATION
REV EMULATION
MODEM OPTIONS
CARD #1
CARD #2
CARD #3
LOCAL MODEM AUPC
MODEM SERIAL
CONFIGURATION
Figure 3-3. Main Menu
3–5
(NOT APPLICABLE)
(NOT APPLICABLE)
(NOT APPLICABLE)
SNM-1000 Node Control Modem
Operation
Revision 3
MN/SNM1000.IOM
Note: The following menus show the modem functions that are available operating as a
DAMA Controller (DAC). The default settings for the DAMA Controller are shown
underlined.
3.4
OPENING SCREEN
SNM 1000
NA 2000
3.4.1
FUNCTION SELECT:CONFIGURATION
FUNCTION SELECT
CONFIGURATION
3.4.1.1
CONFIGURATION:MODULATOR
CONFIGURATION
MODULATOR
3.4.1.1.1
MODULATOR: CODE RATE/TYPE
TX-X QPSK 1/2
19.200
kbps
Transmit code rate/type as follows:
TX-A QPSK 1/2 19.200 kbps
TX-B QPSK 1/2 19.200 kbps
TX-C QPSK 1/2 19.200 kbps
TX-D QPSK 1/2 19.200 kbps
TX-V QPSK 1/2 19.200 kbps
Upon entry, the current transmitter rate is displayed.
3–6
SNM-1000 Node Control Modem
Operation
3.4.1.1.2
Revision 3
MN/SNM1000.IOM
MODULATOR:TX-IF FREQENCY
TX-IF FREQUENCY
70.000000 MHz
Displays the modulator TX IF frequency between 50 and 180 MHz, in 1 Hz steps.
Upon entry, the current transmitter frequency is displayed with the flashing cursor on the
first character. Press [← ] or [→] to move the flashing cursor, and [↑ ] or [↓ ] to increase
or decrease the digit at the flashing cursor. Press <ENTER> to execute the change.
3.4.1.1.3
MODULATOR:TX-IF OUTPUT
TX-IF OUTPUT
ON
Displays the modulator output status, either On or Off.
3.4.1.1.4
MODULATOR:TX POWER LEVEL
TX POWER LEVEL
-20.0 dBm
Displays the modulator output level from:
•
-5.0 to –30.0 dBm (Normal Range)
Upon entry, the current output power level is displayed with the flashing cursor on the
first character. Press [← ] or [→] to move the flashing cursor, and [↑ ] or [↓ ] to increase
or decrease the digit at the flashing cursor. Press <ENTER> to execute the change.
3–7
SNM-1000 Node Control Modem
Operation
3.4.1.1.5
Revision 3
MN/SNM1000.IOM
MODULATOR:SCRAMBLER
SCRAMBLER
ON
Displays the scrambler status, either On or Off.
3.4.1.1.6
MODULATOR:DIFF. ENCODER
DIFF. ENCODER
OFF
Displays the differential encoder status, either On or Off.
3.4.1.1.7
MODULATOR:CARRIER MODE
CARRIER MODE
NORMAL-MODULATED
Displays the carrier mode of operation as follows:
Normal-Modulated
Center-CW
Offset-CW
Dual-CW
The carrier mode in normally in this Off position.
Generates a carrier at the current modulator frequency. This can be used to
measure the output frequency.
Generates a single, upper, side-band-suppressed carrier signal. The upper sideband is at one-quarter of the symbol rate from the carrier. When inverted
spectrum is selected, this generates a single, lower, side-band-suppressed
carrier.
Generates a dual side-band suppressed carrier signal. Side-bands are at one-half
of the symbol rate from the carrier. This is used to check the channel balance and
carrier null.
Upon entry, the current carrier mode is displayed with the flashing cursor on the first
character. Press [↑ ] or [↓ ] to change the carrier mode. Press <ENTER> to execute the
change.
3–8
SNM-1000 Node Control Modem
Operation
3.4.1.1.8
Revision 3
MN/SNM1000.IOM
MODULATOR:MODEM REFERENCE
MODEM REFERENCE
INTERNAL
Displays the following references to the modulator:
•
•
INTERNAL
EXT1, EXT5, EXT10 and EXT20 MHz EXT REF (CP3)
Note: If any EXT REF is selected for the modem reference and there is no input to CP3,
the modem will detect an alarm and switch to the INTERNAL clock.
Upon entry, the current modem reference is displayed with the flashing cursor on the first
character. Press [↑ ] or [↓ ] change the modem reference. Press <ENTER> to execute the
change.
3.4.1.2
CONFIGURATION:DEMODULATOR
CONFIGURATION
DEMODULATOR
3.4.1.2.1
DEMODULATOR:CODE RATE/TYPE
RX-X QPSK 1/2
19.200
kbps
Receive code rate/type as follows:
RX-A QPSK 1/2 19.200 kbps
RX-B QPSK 1/2 19.200 kbps
RX-C QPSK 1/2 19.200 kbps
RX-D QPSK 1/2 19.200 kbps
RX-V QPSK 1/2 19.200 kbps
Upon entry, the current transmitter rate is displayed. Press [↑ ] or [↓ ] change the
assigned filter. Press <ENTER> to execute the change.
3–9
SNM-1000 Node Control Modem
Operation
3.4.1.2.2
Revision 3
MN/SNM1000.IOM
DEMODULATOR:RX-IF FREQUENCY
RX-IF FREQUENCY
70.000000 MHZ
Displays the demodulator receive frequency, between 50 and 180 MHz, in 1 Hz steps.
3.4.1.2.3
DEMODULATOR:DESCRAMBLER
DESCRAMBLER
ON
Displays the descrambler status, either On or Off.
3.4.1.2.4
DEMODULATOR:DIFF.DECODER
DIFF. DECODER
ON
Displays the differential decoder status, either On or Off.
3.4.1.2.5
DEMODULATOR:RF LOOP BACK
RF LOOP BACK
OFF
Displays the RF loop back status, either On or Off.
3.4.1.2.6
DEMODULATOR:IF LOOP BACK
IF LOOP BACK
OFF
Displays the IF loop back status, either On or Off.
3–10
SNM-1000 Node Control Modem
Operation
3.4.1.2.7
Revision 3
MN/SNM1000.IOM
DEMODULATOR:BER THRESHOLD
BER THRESHOLD
NONE
Displays the BER threshold .
If the BER threshold set is exceeded, a receive fault will be indicated by the modem
status indicators. BER threshold may be set from 1.0 E-3 to 1.0 E-8, or may be disabled
by specifying NONE.
3.4.1.2.8
DEMODULATOR:SWEEP CENTER
SWEEP CENTER
+
0 HZ
Displays the sweep center frequency for the directed sweep function. When in directed
sweep, the value from the sweep monitor screen (when the modem was last locked)
should be entered for the sweep center frequency. The sweep center frequency can be set
in the range from –35000 to +35000 Hz. Default: 0 Hz.
Upon entry, the current sweep center frequency is displayed with the flashing cursor on
the first character. Press [← ] or [→] to move the flashing cursor, and [↑ ] or [↓ ] to
increase or decrease the digit at the flashing cursor. Press <ENTER> to execute the
change.
3.4.1.2.9
DEMODULATOR:SWEEP RANGE
SWEEP RANGE
30000 HZ
Displays the overall travel of the sweep width range during acquisition in the directed
sweep mode. The sweep width may be set from 0 to 70000 Hz. Default: 30000 Hz.
When set at 70000 Hz, the modem is in Normal acquisition mode. The smaller the range,
the faster the modem will lock, provided the receive carrier center frequency is within the
RX-IF frequency sweep range.
3–11
SNM-1000 Node Control Modem
Operation
3.4.1.2.10
Revision 3
MN/SNM1000.IOM
DEMODULATOR:REACQUISITION
REACQUISITION
0 SECONDS
Displays the sweep reacquisition mode time duration. This is the time that the modem
will remain in a narrow sweep after loss of acquisition. After this timer runs out, the
modem will return to the normal acquisition sweep. The reacquisition time is 0 to 999
seconds. Default: 0 seconds.
3.4.1.3
CONFIGURATION:INTERFACE
CONFIGURATION
INTERFACE
3.4.1.3.1
INTERFACE:TX CLOCK SOURCE
TX CLOCK SOURCE
SCT (INTERNAL)
Programs the clock source for the modem transmitter clock to the following
configurations:
TX Terrestrial
Sets the TX clock to recover timing from the incoming clock/data.
SCT (INTERNAL)
Sets the TX clock to operate from the modem internal clock (this also is the
fallback clock).
Note: When loop timing is enabled, SCT (LOOP) is displayed instead of
SCT (INTERNAL).
EXT CLOCK
Sets the TX clock to operate from the EXT-CLK clock. Transmit clock source
must be phase/frequency locked to the data that is being transmitted. The
correct frequency must be programmed into EXT-CLK FREQ.
Upon entry, the current TX clock source is displayed. Press [↑ ] or [↓ ] to make the
selection. Press <ENTER> to execute the change.
3–12
SNM-1000 Node Control Modem
Operation
3.4.1.3.2
Revision 3
MN/SNM1000.IOM
INTERFACE:TX CLOCK PHASE
TX CLOCK PHASE
NORMAL
Programs the TX clock phase to AUTO, NORMAL, INVERT.
Upon entry, the current TX clock phase is displayed. Press [↑ ] or [↓ ] to make the
selection. When AUTO is s elected, the modem will automatically select NORMAL or
INVERT to properly phase the TX clock with the TX data. Press <ENTER> to execute
the change.
3.4.1.3.3
INTERFACE:EXT-CLK FREQ
EXT-CLK FREQ
1544.000 KHZ
Programs the external reference clock input frequency between 8.0 kHz and 10.0 MHz.
Default: 1544 kHz.
Note: The clock rate must be equal to the data rate unless the asymmetrical loop timing
option is present.
This clock frequency can be any multiple of 600 Hz from 2.4 to 64 kHz, and can be any
multiple of 8 kHz from 64 kHz to 4.376 MHz.
This can be used for the Doppler/plesiochronous buffer reference. It can be a reference to
SCT. Use the master clock input on J8 for the external master reference. The EXT REF
on CP3 only allows for 1, 5, 10, and 20 MHz external reference input.
Upon entry, the current setting for the external reference is displayed. Press [←] or [→]
to increment or decrement the digit at the flashing cursor. Press [ENTER] to execute the
change.
3–13
SNM-1000 Node Control Modem
Operation
3.4.1.3.4
Revision 3
MN/SNM1000.IOM
INTERFACE:BUFFER CLOCK
BUFFER CLOCK
RX (SATELLITE)
Programs the interface buffer output clock to one of the following modes:
RX (SATELLITE)
Sets the output buffer clock to the satellite clock. (This is a Bypass.)
SCT (INTERNAL)
Sets the buffer clock to operate from the modem internal clock. This is
also the fallback clock.
EXT. CLOCK
Sets this clock source to the external clock.
TX TERRESTRIAL
Sets the buffer output clock to recover timing from the incoming TX data
clock.
INSERT CLOCK
Selects the recovered clock from the insert send data input received from
the terrestrial equipment.
Upon entry, the current setting of the plesiochronous buffer clock is displayed. Press [↑] or
[↓] to make the selection. Press [ENTER] to execute the change.
3.4.1.3.5
INTERFACE:RX CLOCK PHASE
RX CLOCK PHASE
NORMAL
Programs the RX clock phase to Normal or Inverted.
Upon entry, the status of the RX Clock is displayed. Press [↑] or [↓] to make the selection.
Press [ENTER] to execute the change.
3–14
SNM-1000 Node Control Modem
Operation
3.4.1.3.6
Revision 3
MN/SNM1000.IOM
INTERFACE:B-BAND LOOP BACK
B-BAND LOOP BACK
OFF
Programs the modem for baseband loopback operation, On or Off.
When baseband loopback is turned on, the data and timing signals are switched from the
demodulator to the modulator on the modem side of the interface. The DTE baseband
signals are also looped back from the transmitter data and clock to receiver data and clock
on the customer side of the interface. This is a bi-directional loopback of the baseband data.
Refer to figure 3-4 for a block diagram of baseband loopback operation.
Upon entry, the status is displayed. Press [↑] or [↓] to make the selection. Press [ENTER]
to execute the change.
CUSTOMER
DATA
IBS OR IDR
ENCODER/
MODULATOR
TRANSMIT RF
EQUIPMENT
INTERFACE
ANTENNA
REMOTE SERIAL
INTERFACE
MICROCOMPUTER
POWER SUPPLY
AC POWER
FAULT INDICATORS
DEMODULATOR/
DECODER
RECEIVE RF
EQUIPMENT
SATELLITE MODEM
Figure 3-4. Baseband Loopback
Note: When baseband loopback is turned on, data is looped back on the customer side of the interface.
This is a bi-directional loopback of the baseband data. This test mode will verify the customer equipment
and cabling between the modem and the customer equipment. The baseband loopback is not bi-directional
in D&I.
3–15
SNM-1000 Node Control Modem
Operation
3.4.1.3.7
Revision 3
MN/SNM1000.IOM
INTERFACE:BUFFER SIZE
BUFFER SIZE
384 BITS
Sets the size of the buffer, 32 to 262144 bits, 1 to 99 mS , or 0 (Bypass)
Upon entry, the current buffer length is displayed. Press [↑] or [↓] to select the desired
buffer size. The buffer size is displayed in seconds or bits. Enter the Utility Interface menu
to change the buffer units to seconds or bits.
•
•
•
If selecting seconds, choose from 1 to 99 ms, in increments of 1 ms,
or 0 (Bypass).
If selecting bits, choose from 32 to 262144 bits, in increments of 16 bits.
Press [ENTER] to execute the change.
Note: To have the modem calculate the plesiochronous shift, set the buffer units to ms.
When a specific buffer depth is desired, set the buffer units to bits. Select bits or ms from
the Utility Interface menu.
3.4.1.3.8
INTERFACE:BUFFER CENTER
BUFFER CENTER
YES/NO
This configuration function is used to center the buffer. Choosing YES centers the buffer.
Press <ENTER> twice to center the buffer.
3–16
SNM-1000 Node Control Modem
Operation
3.4.1.3.9
Revision 3
MN/SNM1000.IOM
INTERFACE:LOOP TIMING
LOOP TIMING
OFF
The SCT output will become phase-locked to the RX satellite clock.
TX and RX data rates must be equal unless the asymmetrical loop timing option is On or
Off.
3.4.1.4
•
Upon entry, the status is displayed.
•
Press [↑] or [↓] to make the selection.
•
Press [ENTER] to execute the change.
CONFIGURATION:SAVE
CONFIGURATION
SAVE
The Configuration Save menu allows programming of configuration parameters into
memory on the M&C. There are five memory locations that may be used to store specific
configuration setups that are used frequently. After changing the configuration
parameters to the desired settings, enter the Configuration Save menu and select memory
location 1 through 5.
Press [ENTER] to execute the save.
3.4.1.5
CONFIGURATION:RECALL
CONFIGURATION
RECALL
The Configuration Recall menu allows the user to recall a previously saved configuration
setup. Upon entry, select memory location 1 through 5 by pressing [↑] or [↓].
Press [ENTER] to execute the recall.
3–17
SNM-1000 Node Control Modem
Operation
3.4.2
Revision 3
MN/SNM1000.IOM
FUNCTION SELECT:MONITOR
FUNCTION SELECT
MONITOR
3.4.2.1
MONITOR:RAW BER
RAW BER
NO DATA
Displays the current BER or “No Data” (if carrier is not locked).
Range: < m.m E-e to > m.m E-e.
Note: Low limit is based on performance. High limit is based on data/code rate.
3.4.2.2
MONITOR:CORRECTED BER
CORRECTED BER
NO DATA
Displays the current corrected BER or “No Data” (if carrier is not locked).
Range: 1.0 E-3 to 1.0 E-12.
Note: Low limit is based on performance. High limit is 1.0 E-12.
3–18
SNM-1000 Node Control Modem
Operation
3.4.2.3
Revision 3
MN/SNM1000.IOM
MONITOR:EB/NO
EB/NO
16.0
Displays the current Eb/N0 or “No Data” (if carrier is not locked).
Range: 2.0 to 16.0 dB.
Note: Low limit is based on the data rate. High limit is 16.0 dB.
3.4.2.4
MONITOR:RECEIVE SIGNAL
RECEIVE SIGNAL
-60.0 DBM
Displays the current receive signal level.
Range: -25.0 to -60.0 dBm.
3.4.2.5
MONITOR:SWEEP FREQUENCY
SWEEP FREQUENCY
+
0 HZ
Displays the current offset frequency or “No Data” (if carrier is not locked).
Range: -35,000 to +35,000 Hz.
3.4.2.6
MONITOR:BUFFER FILL
BUFFER FILL
50%
Displays the current plesiochronous buffer fill status percent.
Range: 1 to 99%.
3–19
SNM-1000 Node Control Modem
Operation
3.4.3
Revision 3
MN/SNM1000.IOM
FUNCTION SELECT:FAULTS/ALARMS
FUNCTION SELECT
FAULTS/ALARMS
The Faults/Alarms menu is accessible from the Function Select menu. The Faults/Alarms
are similar to monitor functions, as they display the current fault status of the group being
displayed.
Press [←] or [→] to move between the following Faults/Alarms groups:
•
•
•
•
•
Modulator
Demodulator
Transmit Interface
Receive Interface
Common Equipment
Line 2 of the display shows the current Faults/Alarms status in real time. For each
parameter monitored, fault status is displayed as one of the following:
•
•
•
“–” indicates that no fault or alarm exists.
“+” indicates that a fault exists, and will cause switching in a redundant system.
Reversed contrast “+” indicates an active alarm.
Unlike faults, alarms do not cause switching to occur. To display labels for individual
faults or alarms, press [ENTER].
Press [←] or [→] to move the flashing cursor to make the selection. The label for that
Fault/Alarm is then displayed on line 1 of the display. Press [CLEAR] to exit this level of
operation and return to the previous level.
The following sections outline the faults and alarms monitored and displayed in each
group.
3–20
SNM-1000 Node Control Modem
Operation
3.4.3.1
Revision 3
MN/SNM1000.IOM
FAULTS AND ALARMS:MODULATOR
MODULATOR
+--------
3.4.3.2
IF SYNTHESIZER
Modulator IF synthesizer fault.
DATA CLOCK SYN
Transmit clock synthesizer fault. Indicates the internal Voltage
Controlled Oscillator (VCO) has not locked to the incoming data
clock.
I CHANNEL
I channel data activity fault.
Q CHANNEL
Q channel data activity fault.
AGC LEVEL
TX IF AGC level fault.
MODEM REF ACT
MODEM REF activity alarm.
MODEM REF PLL
MODEM REF PLL not locked.
MODULE
Modulator module fault.
CONFIGURATION
Modulator configuration fault.
FAULTS AND ALARMS:DEMODULATOR
DEMODULATOR
+-++----CARRIER DETECT
IF SYNTHESIZER
Carrier detect fault. Indicates the decoder is not locked.
Demodulator IF synthesizer fault. Indicates the IF synthesizer is
not locked.
I CHANNEL
I channel activity fault. Indicates a loss of activity in the I channel
of the quadrature demodulator.
Q CHANNEL
Q channel activity fault. Indicates a loss of activity in the
Q channel of the quadrature demodulator.
BER THRESHOLD
Secondary alarm result of the BER threshold set in the DEMOD
Configuration menu.
MODULE
Demodulator/decoder module fault.
CONFIGURATION
Demodulator/decoder configuration fault.
3–21
SNM-1000 Node Control Modem
Operation
3.4.3.3
Revision 3
MN/SNM1000.IOM
FAULTS AND ALARMS:TX INTERFACE
TX INTERFACE
--------TX DROP
Not Applicable.
TX DATA/AIS
Data or AIS. When data fault is selected in the Interface Configuration
menu, the fault indicates a data stable condition. This indicates the
data is all 1s or 0s (i.e., data is not transitioning). When AIS is
selected, the alarm indicates the data is all 1s from customer data input
to the modem. When None is selected in the Interface Configuration
menu, the TX Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
TX CLK PLL
Transmitter phase-locked loop fault. Indicates the transmitter
Phase-Locked Loop (PLL) is not locked.
TX CLK ACTIVITY
Activity detector alarm of the selected interface transmit clock.
The interface will fall back to the internal clock when this alarm
is active.
TX AUDIO 1 CLIP
Not Applicable.
TX AUDIO 2 CLIP
Not Applicable.
CONFIGURATION
TX interface configuration fault.
Indicates the TX interface cannot execute a programmed
configuration parameter.
3–22
SNM-1000 Node Control Modem
Operation
3.4.3.4
Revision 3
MN/SNM1000.IOM
FAULTS AND ALARMS:RX INTERFACE
RX INTERFACE
--------BUFFER UNDERFLOW
Buffer underflow alarm. Indicates that a buffer underflow has
occurred.
BUFFER OVERFLOW
Buffer overflow alarm. Indicates that a buffer overflow has
occurred.
RX DATA/AIS
Data or AIS. When data fault is selected in the Configuration
Interface menu, the fault indicates a data stable condition. This
indicates the data coming from the satellite is all 1s or 0s (i.e.,
data is not transitioning). When AIS is selected, the Alarm
indicates the data is all 1s from the satellite. When None is
selected in the Configuration Interface menu, the RX Data/AIS
Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
FRAME BER
Frame BER fault. Indicates that the frame BER exceeds 1-3.
BACKWARD ALARM
Not Applicable.
BUFFER CLK PLL
Buffer clock phase-locked loop fault. Indicates the buffer clock
PLL is not locked.
BUFFER CLK ACT
Activity detector alarm of the selected interface receive clock.
The interface will fall back to the satellite clock when this fault is
active.
DEMUX LOCK
DEMUX lock fault. Indicates that the DEMUX is not locked.
RX 2047 LOCK
RX 2047 lock alarm. Indicates the RX 2047 data pattern is not
locked.
Note: This alarm is only active if RX 2047 is ON.
BUFFER FULL
Buffer full alarm. Indicates the buffer is less than 10% or greater
than 90% full.
RX INSERT
Not Applicable.
RX AUDIO 1 CLIP
Not Applicable.
RX AUDIO 2 CLIP
Not Applicable.
CONFIGURATION
Configuration alarm.
3–23
SNM-1000 Node Control Modem
Operation
3.4.3.5
Revision 3
MN/SNM1000.IOM
FAULTS AND ALARMS:COMMON
COMMON
---------
BATTERY/CLOCK
Battery or clock fault.
-12V SUPPLY
-12V power supply fault.
+12V SUPPLY
+12V power supply fault.
+5V SUPPLY
+5V power supply fault.
SELF TEST
Not Applicable.
CONTROLLER
Controller fault. Typically indicates the controller has gone
through a power on/off cycle.
INTERFACE MODULE
Interface module fault. Typically indicates that the interface
module is missing or will not program.
3–24
SNM-1000 Node Control Modem
Operation
3.4.4
Revision 3
MN/SNM1000.IOM
FUNCTION SELECT:STORED FLTS/ALMS
FUNCTION SELECT
STORED FLTS/ALAMS
The modem stores the first 10 (Flt0 through Flt9) occurrences of fault status changes in
each of the following major fault categories:
•
•
•
•
•
Modulator
Demodulator
Transmit Interface
Receive Interface
Common Equipment
Each fault status change is stored with the time and date of the occurrence of the fault.
Stored faults may be viewed by entering the stored faults level from the Select menu.
Stored faults are not maintained through controller power-on reset cycle. However, the
last known time is maintained in nonvolatile Random Access Memory (RAM). On
power-up, a common equipment fault is logged (Flt0) with that last known time and date.
In addition, on power-up, an additional common equipment fault is logged (Flt1) to
indicate the power-up time and date. The power-down and power-up times are logged as
common equipment fault 0 and common equipment fault 1, respectively.
On entering the stored faults level, press [←] or [→] to move between the fault groups
and the “Clear Stored Faults ?” selections. The time and date of the first stored fault
status (Flt0) for the selected group will be displayed alternately on line 2 of the display.
Press [↑] or [↓] to cycle through the selected group has stored fault status (Flt0 through
Flt9). To display the fault status associated with the displayed time and date, press
[ENTER]. To identify the fault, press [←] or [→] to move the flashing cursor. To clear
the currently logged stored faults, press [ENTER] when the “Clear Stored Faults/Yes?”
selection is displayed.
Note: Faults are stored in time sequence, with the oldest fault status change stored in
Flt0, and the most recent in Flt9. Only the first 10 fault status changes are stored. All
stored faults, which have not been used, indicate “No Fault” on the display.
3–25
SNM-1000 Node Control Modem
Operation
3.4.4.1
Revision 3
MN/SNM1000.IOM
STORED FLTS/ALMS:MODULATOR
MODULATOR
STORED TIME/DATE
X
(FAULT LABEL)
--------IF Synthesizer
DATA CLOCK SYN
I CHANNEL
Q CHANNEL
AGC LEVEL
MODEM REF ACT
MODEM REF PLL
MODULE CONFIGURATION
3.4.4.2
STORED FLTS/ALMS:DEMODULATOR
DEMODULATOR
STORED TIME/DATE
X
(FAULT LABEL)
--------CARRIER DETECT
IF SYNTHESIZER
I CHANNEL
Q CHANNEL
BER THRESHOLD
MODEL
CONFIGURATION
3–26
SNM-1000 Node Control Modem
Operation
3.4.4.3
Revision 3
MN/SNM1000.IOM
STORED FLTS/ALMS:TX INTERFACE
TX INTERFACE
STORED TIME/DATE
X
(FAULT LABEL)
--------TX DROP
TX DATA/AIS
TX CLK PLL
TX CLK ACTIVITY
TX AUDIO 1 CLIP
TX AUDIO 2 CLIP
CONFIGURATION
3.4.4.4
(Not Applicable)
(Not Applicable)
(Not Applicable)
STORED FLTS/ALMS:RX INTERFACE
RX INTERFACE
STORED TIME/DATE
X
(FAULT LABEL)
--------BUFFER UNDERFLOW
BUFFER OVERFLOW
RX DATA/AIS
FRAME BER
BACKWARE ALARM
BUFFER CLK PLL
BUFER CLK ACT
DEMUX LOCK
RX 2047 LOCK
BUFFER FULL
RX INSERT
RX AUDIO 1 CLIP
RX AUDIO 2 CLIP
CONFIGURATION
(Not Applicable)
(Not Applicable)
(Not Applicable)
(Not Applicable)
3–27
SNM-1000 Node Control Modem
Operation
3.4.4.5
Revision 3
MN/SNM1000.IOM
STORED FLTS/ALMS:COMMON
COMMON
STORED TIME/DATE
X
(FAULT LABEL)
--------BATTERY/CLOCK
-12 VOLT SUPPLY
+12 VOLT SUPPLY
+5 VOLT SUPPLY
SELF TEST
CONTROLLER
INTERFACE MODULE
3.4.4.6
(Not Applicable)
STORED FLTS/ALMS:UNAVL SECONDS
UNAVAL SECONDS
STORED TIME/DATE
X
Note: Reed-Solomon option only.
A fault is indicated if the Reed-Solomon Codec could not correct bit errors in one block
of serialized data in any given second.
3.4.4.7
STORED FLTS/ALMS:CLEAR
CLEAR ??
STORED FAULTS
3–28
SNM-1000 Node Control Modem
Operation
3.4.5
Revision 3
MN/SNM1000.IOM
FUNCTION SELECT:UTILITY
FUNCTION SELECT
UTILITY
The Function Select Utility menu is divided into the following categories:
•
•
•
•
•
•
•
Modulator
Demodulator
Interface
Network
System
Modem Type
Factory Setup
The menu information includes:
•
•
•
•
•
•
•
•
•
•
•
Filter Types
Terrestrial Interface Types
Mod/Demod Types
Time/Date
Encoder/Decoder Types
Modem Types
Current Firmware
Test Mode Status
Overhead Type
Revision Emulation
Lamp Test
Provisions are also made for assigning data and code rates to the modulator and
demodulator.
After entering the Utility menu, press [←] or [→] to select the desired sub-menu, and
press [ENTER].
Notes:
1. The Utility Factory Setup menu is for Comtech EF Data service personnel only.
Entering this menu without authorization may cause the modem to operate
incorrectly.
2. Changes in the Utility menu may cause changes in other front panel menus.
3–29
SNM-1000 Node Control Modem
Operation
3.4.5.1
Revision 3
MN/SNM1000.IOM
UTILITY:MODULATOR
UTILITY
MODULATOR
3.4.5.1.1
MODULATOR: ASSIGN TRANSMIT FILTERS
ASSIGN
TRANSMIT FILTERS
Transmit code rate/type as follows:
TX-A QPSK 1/2 19.200 kbps
TX-B QPSK 1/2 19.200 kbps
TX-C QPSK 1/2 19.200 kbps
TX-D QPSK 1/2 19.200 kbps
TX-V QPSK 1/2 19.200 kbps
Upon entry, the current transmitter rate is displayed.
3.4.5.1.2
MODULATOR:MOD POWER OFFSET
MODEM POWER OFFSET
+ 0.0 DB
Modulator power offset adjust. Offsets the modulator output power readout in the
Configuration menu. This feature does not actually change the modulator power level, but
displays an offset value in the monitor.
The modulator power offset range is -99.9 to +99.9 dB, in 0.1 dB steps.
Note: Anything except 0.0 dB will cause ADJ to be displayed for the TX power level.
3–30
SNM-1000 Node Control Modem
Operation
3.4.5.1.3
Revision 3
MN/SNM1000.IOM
MODULATOR:MODULATOR TYPE
MODULATOR TYPE
INTELSAT OPEN
Transmit filter type select. Select one of the following for network filtering:
Note: Change in EFD, ASYNC, or Custom modem types only.
INTELSAT OPEN
EFD CLOSED
CSC CLOSED
FDC CLOSED
SDM-51 COMPATIBLE
Notes:
1. TX filter type is selectable only when CUSTOM is selected for the modem type in
the Utility Modem Type menu.
2. Code Rate 3/4 is not compatible with a combination of a CSC CLOSED Modulator
Type and Sequential Encoder.
3.4.5.1.4
MODULATOR:ENCODER TYPE
ENCODER TYPE
VITERBI
Encoder type selection. Select VITERBI or SEQUENTIAL encoder type.
Notes:
1. Change in EFD, ASYNC, or Custom modem types only.
2. A Sequential Encoder Type and a 3/4 Code Rate combination is
not compatible with a CSC CLOSED Modulator Type.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3–31
SNM-1000 Node Control Modem
Operation
3.4.5.1.5
Revision 3
MN/SNM1000.IOM
MODULATOR:TX BPSK ORDERING
TX BPSK ORDERING
STANDARD
Transmit BPSK bit ordering selection. Select STANDARD or NON-STANDARD
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3.4.5.1.6
MODULATOR:MOD SPECTRUM
MOD SPECTRUM
NORMAL
Programmable vector rotation allows the operator to select NORMAL or INVERT for
spectrum reversal of the I and Q baseband channels.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change
3.4.5.1.7
MODULATOR:TX MODE
TX MODE
BURST
Selection of BURST or CONTINUOUS. Press[←], [→], [↑], or [↓] to move the flashing
cursor. Press [ENTER] to execute the change.
3.4.5.1.8
MODULATOR:TX SYMBOL RATE
TX SYMBOL RATE
19.200 KSPS
Status only. Selects TX Symbol Data rate.
3–32
SNM-1000 Node Control Modem
Operation
3.4.5.2
Revision 3
MN/SNM1000.IOM
UTILITY:DEMODULATOR
UTILITY
DEMODULATOR
3.4.5.2.1
DEMODULATOR:ASSIGN TRANSMIT FILTERS
ASSIGN
TRANSMIT FILTERS
Receive code rate/type as follows:
RX-A QPSK 1/2 19.200 kbps
RX-B QPSK 1/2 19.200 kbps
RX-C QPSK 1/2 19.200 kbps
RX-D QPSK 1/2 19.200 kbps
RX-V QPSK 1/2 19.200 kbps
Upon entry, the current transmitter rate is displayed.
3.4.5.2.2
DEMODULATOR: DEMODULATOR TYPE
DEMODULATOR TYPE
INTELSAT OPEN
Transmit filter type select. Select one of the following for network filtering:
Note: Change in EFD, ASYNC, or Custom modem types only.
INTELSAT OPEN
EFD CLOSED
CSC CLOSED
FDC CLOSED
SDM-51 COMPATIBLE
Notes:
1. TX filter type is selectable only when CUSTOM is selected for the modem type in
the Utility Modem Type menu.
2. Code Rate 3/4 is not compatible with a combination of a CSC CLOSED
Modulator Type and Sequential Encoder.
3–33
SNM-1000 Node Control Modem
Operation
3.4.5.2.3
Revision 3
MN/SNM1000.IOM
DEMODULATOR:DECODER TYPE
DECODER TYPE
VITERBI
Decoder type selection. Select VITERBI or SEQUENTIAL decoder type.
Notes:
1. Change in EFD, ASYNC, or Custom modem types only.
2. A Sequential Decoder Type and a 3/4 Code Rate combination is
not compatible with a CSC CLOSED Modulator Type.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3.4.5.2.4
DEMODULATOR:RX BPSK ORDERING
RX BPSK ORDERING
STANDARD
Receive BPSK bit ordering selection. Select STANDARD or NON-STANDARD
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3.4.5.2.5
DEMODULATOR:DEMOD SPECTRUM
DEMOD SPECTRUM
NORMAL
Programmable vector rotation allows the operator to select NORMAL or INVERT for
spectrum reversal of the I and Q baseband channels.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3–34
SNM-1000 Node Control Modem
Operation
3.4.5.2.6
Revision 3
MN/SNM1000.IOM
DEMODULATOR:RX MODE
RX MODE
CONTINUOUS
Selection of BURST or CONTINUOUS.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change..
3.4.5.2.7
DEMODULATOR:RX SYMBOL RATE
RX SYMBOL RATE
19.200 KSPS
Status only.
Selects RX Symbol Data rate, with 4.800 to 2500.000 ksps.
3.4.5.3
UTILITY:INTERFACE
UTILITY
INTERFACE
3.4.5.3.1
INTERFACE:TX OVERHEAD TYPE
TX OVERHEAD TYPE
NONE
Select None for TX overhead type.
Note: Overhead types are selectable only when Custom is selected for modem type in the
Utility Modem Type menu.
3–35
SNM-1000 Node Control Modem
Operation
3.4.5.3.2
Revision 3
MN/SNM1000.IOM
INTERFACE:RX OVERHEAD TYPE
RX OVERHEAD TYPE
NONE
Select None RX overhead type.
Note: Overhead types are selectable only when Custom is selected for modem type in the
Utility Modem Type menu.
3.4.5.3.3
INTERFACE:TX TERR INTERFACE
TX TERR INTERFACE
RS422
Displays the TX interface type RS-232, RS-422, or V.35.
Note: Not applicable since SNM-1000 is not used for User Data Traffic.
3.4.5.3.4
INTERFACE:RX TERR INTERFACE
RX TERR INTERFACE
RS422
Displays the RX interface type RS-232, RS-422, or V.35.
Note: Not applicable since SNM-1000 is not used for User Data Traffic.
3.4.5.3.5
INTERFACE:BUFFER PROGRAM
BUFFER PROGRAM
BITS
Buffer unit program function. Select MILLI-SECONDS or BITS.
Note: To have the modem calculate the plesiochronous shift, set the buffer units to MILLISECONDS. For a specific buffer depth, set the buffer units to BITS.
3–36
SNM-1000 Node Control Modem
Operation
3.4.5.3.6
Revision 3
MN/SNM1000.IOM
INTERFACE:FRAMING STRUCTURE
FRAMING STRUCTURE
T1 FRAMING
STRUCTURE:
G.704
E1 FRAMING
STRUCTURE:
G.704
Displays the currently selected framing type and structure of the data. This function is used
with the buffer program in ms for plesiochronous buffer slips.
Upon entry, the framing type (T1 or E1) is displayed on Line 1. The framing structure of
each type (None or G.704) is displayed on Line 2. Press [←] or [→] and [↑] or [↓] to select
framing structure and type. Press [ENTER] to execute the change.
3.4.5.3.7
INTERFACE:RTS TX-IF CNTRL
RTS TX-IF CNTRL
OFF
Programs the modem to allow a Request To Send (RTS) signal to On or Off the output
when data is ready for transmission.
Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the
change.
3.4.5.3.8
INTERFACE:TX DATA PHASE
TX DATA PHASE
NORMAL
TX data phase relationship. Use this option to select NORMAL or INVERT for the TX
data relationship to the selected TX clock.
Upon entry, press [↑] or [↓] to make the selection. Press [ENTER] to execute the change.
3–37
SNM-1000 Node Control Modem
Operation
3.4.5.3.9
Revision 3
MN/SNM1000.IOM
INTERFACE:RX DATA PHASE
RX DATA PHASE
NORMAL
RX data phase relationship. Use this option to select NORMAL or INVERT for the RX
data relationship to the selected RX clock.
Upon entry, press [↑] or [↓] to make the selection. Press [ENTER] to execute the change.
3.4.5.3.10
INTERFACE:CTS DELAY
CTS DELAY
X SECONDS
Sets the delay in seconds (0 to 60) for the Clear To Send (CTS) signal.
Default: 0 Seconds.
3.4.5.4
UTILITY:NETWORK
SNM 1000
NA 2000
3.4.5.4.1
NETWORK:RELEASE
SNM 1000
REL 4.X.X
Status only.
Shows installed version of DAC code and code’s CRC in hexadecimal.
e.g. rel 4.3.0 p cc14
3–38
SNM-1000 Node Control Modem
Operation
3.4.5.4.2
Revision 3
MN/SNM1000.IOM
NETWORK:CHANNELS 1 -15
CHANNELS 1 – 15
---------------
3.4.5.4.3
Status only.
NETWORK:CHANNELS 16 - 31
CHANNELS 16 – 31
---------------
3.4.5.5
I
O
C
S
D
= Traffic Modem Not Installed
= Traffic Modem Idle
= Traffic Modem Offline
= Call in Progress
= Connecting Call
= Disconnecting Call
UTILITY:SYSTEM
UTILITY
SYSTEM
3.4.5.5.1
SYSTEM:TIME/DATE
TIME: 12:00:00AM
DATE: 7/04/1976
Time of day and date display/set function.
The current time and date in the modem’s memory are displayed when selected.
To change the modem time and/or date, press [ENTER].
•
•
•
Press [←] or [→] to position the cursor over the parameter to be changed.
Press [↑] or [↓] to change the parameter.
Once the parameters are displayed as desired, press [ENTER] to set the time and
date.
3–39
SNM-1000 Node Control Modem
Operation
3.4.5.5.2
Revision 3
MN/SNM1000.IOM
SYSTEM:REMOTE BAUD RATE
REMOTE BAUD RATE
19.200 BPS NONE
The parity and baud rate settings of the modem are displayed.
To change the modem parity, press [ENTER].
• Press [←] or [→] to position the cursor over the parameter to be changed.
• Press [↑] or [↓] to change the parameter.
• Once the parameters are displayed as desired, press [ENTER] to set the baud rate
and parity.
• The parity can be set to EVEN, ODD, or NONE.
The baud rate is 19200 bit/s.
3.4.5.5.3
SYSTEM:REMOTE ADDRESS
REMOTE ADDRESS
1
The current modem address is displayed (1 to 255).
Note: 0 is reserved as a global address.
To change the remote address, press [ENTER]. Press [↑] or [↓] to make the selection. Press
[ENTER] to execute the change.
3.4.5.5.4
SYSTEM:REMOTE TYPE
REMOTE TYPE
RS485 (2-WIRE)
Select RS-485 (2-Wire), RS-485 (4-Wire), or RS-232.
3–40
SNM-1000 Node Control Modem
Operation
3.4.5.5.5
Revision 3
MN/SNM1000.IOM
SYSTEM:OPERATION MODE
OPERATION MODE
DUPLEX
Programs the modem for DUPLEX, TRANSMIT ONLY, or RECEIVE ONLY operation.
Upon entry, the operational status may be changed. Press [↑] or [↓] to make the selection.
Press [ENTER] to execute the change.
Note: When TRANSMIT ONLY or RECEIVE ONLY are selected, the appropriate faults
are masked from the Faults and Stored Faults menus.
3.4.5.5.6
SYSTEM:YEAR DISPLAY
YEAR DISPLAY
2 - DIGIT
Selects the display for the year in either 2-digit or 4-digit format.
Upon entry, the year display may be changed. Press [↑] or [↓] to make the selection. Press
[ENTER] to execute the change
3.4.5.5.7
SYSTEM:TEST MODE STATUS
TEST MODE STATUS
--------Test mode status indicator. The following modem test points are listed and display a “+”
when a test mode is active:
!
!
!
!
!
!
•
•
RS CORR OFF
INTRFC LOOP BACK
B-BAND LOOP BACK
RF LOOP BACK
IF LOOP BACK
CARRIER MODE
RX 2047 Pattern
TX 2047 Pattern
To view the test modes, press [ENTER]. Press [↑] or [↓] to make the selection.
3–41
SNM-1000 Node Control Modem
Operation
3.4.5.5.8
Revision 3
MN/SNM1000.IOM
SYSTEM:LAMP TEST ??
LAMP TEST ??
PRESS ENTER
Lamp test function. Press [ENTER] to turn the front panel indicators on for 3 seconds.
3.4.5.5.9
SYSTEM:SELF TEST (NOT APPLICABLE)
3.4.5.5.10
SYSTEM:DISPLAY CONTRAST
DISPLAY CONTRAST
LEVEL:
64
Sets the contrast setting of the Front Panel menu.
Press [ENTER] to begin. Press [↑] or [↓] to increment or decrement the number at the
flashing cursor, from 0 to 100. Press [ENTER] to execute the change.
3.4.5.5.11
SYSTEM:M&C FIRMWARE
M&C FIRWARE
FW/NNNNNN-DDR
Displays the M&C module firmware version.
The display includes the month, day, and year.
3.4.5.5.12
SYSTEM:BOOT FIRMWARE
BOOT FIRWARE
FW/NNNNNN-DDR
Displays the boot module firmware version.
The display includes the month, day, and year
3–42
SNM-1000 Node Control Modem
Operation
3.4.5.5.13
Revision 3
MN/SNM1000.IOM
SYSTEM:FPGA FIRMWARE
FPGA FIRWARE
FW/NNNNNN-DDR
Displays the FPGA module firmware version.
The display includes the month, day, and year
3.4.5.5.14
SYSTEM:EXT AGC: MAX PWR
EXT AGC: MAX PWR
0.0 VOLTS
Sets the AGC voltage for a receive signal level of -60.0 dBm. The voltage range is 0.0 to
10.0V, in 0.5V steps.
Upon entry, the current external AGC voltage level is displayed. Press [↑] or [↓] to
increment or decrement the AGC voltage level in 0.5V steps. Press [ENTER] to execute the
change.
Note: For any receive signal level between -25.0 and -60.0 dBm, the software will
interpolate the required AGC voltage.
3.4.5.5.15
SYSTEM:EXT AGC: MIN PWR
EXT AGC: MIN PWR
10.0 VOLTS
Sets the AGC voltage for a receive signal level of -25.0 dBm. The voltage range is 0.0 to
10.0V, in 0.5V steps.
Upon entry, the current external AGC voltage level is displayed. Press [↑] or [↓] to
increment or decrement the AGC voltage level in 0.5V steps. Press [ENTER] to execute the
change.
Note: For any receive signal level between -25.0 and -60.0 dBm, the software will
interpolate the required AGC voltage.
3–43
SNM-1000 Node Control Modem
Operation
3.4.5.5.16
Revision 3
MN/SNM1000.IOM
SYSTEM:MASTER RESET
MASTER RESET
HARD/SOFT
Initiating a hard reset will reset the modem and place the
default configuration settings in ROM. Initiating a soft reset
will reset the modem hardware, but saves the current
configuration settings.
CAUTION
Select [ENTER] once to access HARD or SOFT.
Press [←] or [→] to make the selection. Press [ENTER].
Press [→] five times to move the cursor to YES. Select YES and press [ENTER] again.
Note: The following parameters do not revert to default settings after a hard reset:
•
•
•
•
•
•
•
Address
Parity
Baud Rate
Remote Type
Ext AGC: Min Pwr
Ext AGC: Max Pwr
Display Contrast
3–44
SNM-1000 Node Control Modem
Operation
3.4.5.6
Revision 3
MN/SNM1000.IOM
UTILITY:MODEM TYPE
UTILITY
MODEM TYPE
3.4.5.6.1
MODEM TYPE:MODEM TYPE
MODEM TYPE
CUSTOM
Selects the following types of modem operation:
•
•
CUSTOM
EFD
Selections are made from the Front Panel menu
Closed Network Operation
When the modem is changed from one type of operation to another, the modem will be
reset to the default configurations of the new modem type. The RF-IF Output must be
turned on to get the modem to lock.
•
•
•
•
If the existing modem type is the same as the type entered, the modem will not
change any parameters.
If the modem type is changed to Custom, no parameters will be changed.
If the modem will not allow the modem type selection, that type of operation
may not be an available option.
Select MODEM OPTIONS and OVERHEAD OPTIONS to see which modem
operations are allowed.
Note: D&I is designed to work with the G.703 interface only.
3–45
SNM-1000 Node Control Modem
Operation
3.4.5.6.2
Revision 3
MN/SNM1000.IOM
MODEM TYPE:MODEM EMULATION
MODEM EMULATION
DISABLED
Selects the following types of modem emulation:
SDM-100
SDM-300
SDM-308-4
SDM-308-4
SDM-308-4
SDM-308-4
SDM-309
SDM-650
SDM-650
SDM-6000
VER: 15.7.1
6.2.2
4.03
6.05
6.08
7.03
6.04
4.12A
4.16
5.1.1
or Disabled
Upon entry, the current modem emulation is displayed. Press [↑] or [↓] to change the
display. Press [ENTER] to execute the change.
3.4.5.6.3
MODEM TYPE:REVISION EMULATION
REV EMULATION
CURRENT VERSION
Programs an emulation mode of a previous functional revision. This allows the user to
select the CURRENT VERSION or FUNCTIONAL X.
Note: The number displayed in the CURRENT VERSION position increases with each
software version change.
Upon entry, the CURRENT VERSION is displayed. Press [↑] or [↓] to select the
FUNCTIONAL version. Press [ENTER] to execute the change.
3–46
SNM-1000 Node Control Modem
Operation
Revision 3
MN/SNM1000.IOM
Notes:
1. Programming a current version (default) allows all features and options (if
installed) to operate normally.
2. Programming a FUNCTIONAL version (X) eliminates any changes that affect
the later version. Only functional changes are affected by the revision emulation
feature.
3. A correction change (e.g., VER 3.1.2) remains fixed in accordance with the latest
version. Since the revision emulation default is the current version, program the
functional version at the start of each operation.
4. The revision emulation feature does not affect some interface changes for the
direct operation of the modem (Configuration save/recall, test mode screen in the
Utility/System, all factory setup modes, etc.).
3.4.5.6.4
MODEM TYPE:MODEM OPTIONS
MODEM OPTIONS
--------------
Displays the installed modem options.
If the option is installed, a “+” symbol is displayed. To view the available options press
[ENTER]. Observe for the flashing cursor. Press the [←] [→] arrows to move from one
symbol to the next. The first line will display the option. The second line will display the
status:
HIGH POWER
HIGH STABILITY
ASLT
VITERBI
SEQUENTIAL
SINGLE RATE
LOW RATE VAR
FULL RATE VAR
CARD #1 PCB
CARD #2 PCB
CARD #3 PCB
8PSK 2/3
TX ONLY
RX ONLY
(0)
(0)
(-)
(+)
(-)
(-)
(-)
(+)
(+)
(x)
(x)
(-)
(-)
(-)
3–47
0 = Not Installed, Not Upgradeable
- = Not Installed
+ = Installed
X = Not Installed, Field Upgradeable
SNM-1000 Node Control Modem
Operation
3.4.5.6.5
Revision 3
MN/SNM1000.IOM
MODEM TYPE:CARD #1 TYPE
CARD #1 TYPE
DAC 01
Status Only.
Displays either of the following:
•
•
DAC 01
NOT INSTALLED
3.4.5.6.6
MODEM TYPE:CARD #2 TYPE (NOT INSTALLED)
3.4.5.6.7
MODEM TYPE:CARD #3 TYPE (NOT INSTALLED)
3.4.5.6.8
MODEM TYPE:LOCAL MODEM AUPC
LOCAL MODEM AUPC
OFF
Configures the modem for the self-monitoring Local Modem AUPC mode and for local TX
power control (self-monitoring) due to severe rain fade.
Notes:
1. The self-monitoring Local Modem AUPC mode is not used when the
ASYNC/AUPC is selected as the Modem Type.
2. Used for local control (self-monitoring) due to severe rain fade.
3.4.5.6.9
MODEM TYPE:MODEM SERIAL
MODEM SERIAL
123456789
Status Only
3–48
SNM-1000 Node Control Modem
Operation
3.4.5.6.10
Revision 3
MN/SNM1000.IOM
MODEM TYPE:CONFIGURATION CODE - MODEM
CONFIGURATION
CODE - MODEM
1)
2)
AAAAAAAAAA
AAAAAAAAAA
If installed, Status Only
Comtech EF Data supplied code.
.
3.4.5.7
UTILITY:FACTORY SETUP (NOT APPLICABLE)
3–49
SNM-1000 Node Control Modem
Operation
3.5
Revision 3
MN/SNM1000.IOM
User Port Operation
The User Port allows the user at the remote site to communicate with the remote control
SNM-1000 to request the setup and termination of circuits, send and receive service
messages, and configure the SNM-1000. The commands configure and control the
SNM-1000 and the traffic modems that have addresses within the range of 1 through 30.
The remote control SNM-1000 modem always utilizes address zero.
The User Port uses a 9-pin mini-DIN female connector on the rear of the SNM-1000. The
port is configured as a DCE with the pin definitions as shown in the following listing.
Signal Function
Receiver Ready
Receive Data
Send Data
Terminal Ready
Signal Ground
Data Mode
Request to Send
Clear to Send
Incoming Call
Name
RR
RD
SD
TR
SG
DM
RS
CS
IC
Pin #
1
2
3
4
5
6
7
8
9
I/O
O
O
I
I
Signal Level
EIA-232
EIA-232
EIA-232
EIA-232
O
I
O
O
EIA-232
EIA-232
EIA-232
EIA-232
The interface operates at 19.2 kbps, 8 data bits, No Parity, and 1 Stop Bit. Levels are in
accordance with EIA-232. The User Port can also be accessed using an optional Public
Switched Telephone Network (PSTN) dial-up modem.
3–50
SNM-1000 Node Control Modem
Operation
3.6
Revision 3
MN/SNM1000.IOM
Remote Dial-Up Capability
The SNM-1000 User Port can be accessed via an external PC modem. A user dials into
an SNM-1000 from a remote location using the following items:
•
•
•
3.6.1
Personal computer
Auto-interface speed-detect modem
Modem terminal software capable of emulating an ANSI terminal
User Port Modem
The remote dial-up was tested using a US Robotics, Inc. external Sportster™ 28.8
modem with V.34 and V.32bis at the User Port. Recommended dip switch settings for
this modem are described in the following listing.
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Down
Up
Up
Down
Up
Up
Up
Up
Data Terminal Override
Verbal Result Codes
Suppress Result Codes
No Echo, Off-line Commands
Auto Answer On
Carrier Detect Normal
Load NOVRAM Defaults
Dumb Mode
The US Robotics, Inc. external Sportster™ 28.8 modem or a similar modem should be
used at the User Port.
3.6.2
Remote Site Modem
The remote dial-up was tested using a US Robotics, Inc. external or internal Sportster™
28.8 modem with V.34 and V.32bis at the remote site. Recommended dipswitch settings
for this modem are the factory default settings.
The US Robotics, Inc. external or internal Sportster™ 28.8 modem or a similar modem
should be used at the remote site.
On the PC, modem setting requirements include the following:
ANSI emulation
19.2, 8, N, 1
Software flow control XON/XOFF
1 ms character pacing for ASCII uploads
3–51
SNM-1000 Node Control Modem
Operation
3.7
Revision 3
MN/SNM1000.IOM
SNM-1000 Commands
The commands described in this section are used to set SNM-1000 functional parameters
within a DAMA environment. Refer to Appendix A for commands used to communicate
with external modems attached to an SNM-1000.
3.7.1
Character Set
The interface responds to ASCII characters in the range of 0x00 to 0x7F. The 8th bit
(most significant) is not generated on the transmit side and is ignored on the receive side.
3.7.2
Status Lines and Flow Control
The interface ignores all status inputs.
3.7.3
Message Structure
A message is either a command or a response. Each message is made up of three
elements:
•
•
•
3.7.3.1
Prefix
Message body
End character
Prefix
The prefix consists of the channel number in ASCII decimal, with a valid range of 0
through 30. Leading zeros are ignored. Prefix 0 is valid for an SNM-1000 Node Control
modem and prefixes 1 through 30 are valid for external traffic modems attached to the
SNM-1000 such as SDM-300s, SDM-6000s, etc.
3–52
SNM-1000 Node Control Modem
Operation
3.7.3.2
Revision 3
MN/SNM1000.IOM
Message Body
The message body is made up of individual commands and fields.
Certain conventions are used to improve the readability of the commands presented in
this document. These conventions do not appear in the commands themselves.
Conventions used in the command names and descriptions include the following
characters.
3.7.3.3
[...]
Square brackets are used to indicate that the enclosed items are optional. (The
square brackets themselves do not appear in the message.)
<...>
Angle brackets are used to enclose the names of other syntactical elements.
(When those elements appear in an actual message, the actual element is used
and the angle brackets are omitted.)
‘...’
Single quotes are used to enclose an ASCII character for illustration of syntax
elements. (The single quotes themselves do not appear in the message.)
End Character
The end character for both command and response messages is a carriage return
(represented by “cr”).
3.7.3.4
Case Sensitivity
Messages are not case sensitive. However, the DCE generates responses and results in
uppercase text.
3.7.3.5
Delimiters
Commas and semicolons are valid delimiters that may be used interchangeably with no
difference in behavior.
3.7.3.6
End Character
Each message is ended with a single character which signals the end of the message:
“]”
End bracket for responses.
3–53
SNM-1000 Node Control Modem
Operation
3.7.3.7
Revision 3
MN/SNM1000.IOM
Queries
The interface can be queried by issuing a valid command without a value at the end. This
will result in the return of the currently set value.
Example (assume a previously sent command as shown):
ICF 70.4567'cr'
— sets inbound control IF frequency to 70.4567 MHz.
Now a query:
ICF'cr'
Response from interface:
ICF 70.4567
3.7.4
— inbound control IF frequency is 70.4567 MHz.
Node Address (NA)
This command sets the node number for the remote control channel mode SNM-1000
controller.
3.7.4.1
Command Format
NA <node_number>'cr'
<node_number>
Range of 1 to 9999 and must be unique in the network.
Unpredictable results will occur if two nodes are online and both have been
assigned the same node number.
The node number will generally be defined by the provisioning documents that
establish remote sites and circuits.
3.7.4.2
Local Command Responses
node address = <node_number>
3–54
SNM-1000 Node Control Modem
Operation
3.7.5
Revision 3
MN/SNM1000.IOM
Receive Control Channel Frequency (ICF)
This command sets the receive (NMS to remote) control channel IF frequency at the
remote node.
3.7.5.1
Command Format
ICF <frequency>'cr'
<frequency>
Entered in MHz.
Range of 50 to 90 MHz, or 100 to 180 MHz
Resolution of 100 Hz.
Formatting is pseudo-floating point.
Example:
ICF 70.4567 sets receive control IF frequency to 70.4567 MHz.
3.7.5.2
Local Command Responses
ICF= <frequency>, <control channel offset>, <traffic channel
offset>
3.7.6
Transmit Control Channel Frequency (OCF)
This command sets the transmit (remote to NMS) control channel IF frequency at the
remote node.
3.7.6.1
Command Format
OCF <frequency>'cr'
<frequency>
Entered in MHz.
Range of 50 to 90 MHz, or 100 to 180 MHz.
Resolution of 100 Hz.
Formatting is pseudo-floating point.
Example:
OCF 70.1234 sets transmit control IF frequency to 70.1234 MHz.
3.7.6.2
Local Command Responses
OCF= <frequency>, <control channel offset>, <traffic channel
offset>
3–55
SNM-1000 Node Control Modem
Operation
3.7.7
Revision 3
MN/SNM1000.IOM
Transmitter On (RF_ON)
This command enables the SNM-1000 transmitter.
3.7.7.1
Command Format
RF_ON'cr'
3.7.7.2
Local Command Responses
None.
3.7.8
Transmitter Off (RF_OFF)
This command disables the SNM-1000 transmitter.
3.7.8.1
Command Format
RF_OFF'cr'
3.7.8.2
Local Command Responses
None.
3.7.9
Transmit Power (TX)
This command sets the SNM-1000 transmit power.
3.7.9.1
Command Format
TX <tx_power>'cr'
<tx_power>
In the range of +5 to -30 dBm, in 0.1 dBm steps.
The format for TX_power is [+] XX.X with an implied minus sign.
3.7.9.2
Local Command Responses
transmit power = <tx_power>
3–56
SNM-1000 Node Control Modem
Operation
3.7.10
Revision 3
MN/SNM1000.IOM
Current SNM-1000 DAC Software Revision (VER)
This command queries the SNM-1000 DAC board for its current software revision
number.
3.7.10.1
Command Format
VERSION'cr' or VER’cr’
3.7.10.2
Local Command Responses
DAC VERSION: X.Y.ZZZ.CCCC
Where:
X.Y = SNM-1000 DAC software release number.
ZZZ = Revision level for the release.
CCCC = Checksum
3.7.11
Node to NMS Service Messages (NMS_MSG)
This command permits the transmission of up to 28 ASCII text characters to the NMS.
3.7.11.1
Command Format
NMS_MSG 'text string to be transmitted to the NMS''cr'
3.7.11.2
Local Command Responses
None.
3–57
SNM-1000 Node Control Modem
Operation
3.7.12
Revision 3
MN/SNM1000.IOM
SNM-1000 Mode (MD)
This command sets the SNM-1000 mode.
3.7.12.1
Command Format
MD <mode>'cr'
<mode>
EXT
Remote Control Channel-External Traffic
Remote Control Channel-External Traffic mode — the modem performs control functions
to control external traffic modems..
3.7.12.2
Local Command Responses
mode = <mode>
3.7.13
Built-In Diagnostic Tests (EFD_DIAG)
Note: Qualified personnel shall perform these tests only.
This command starts the SNM-1000 DAC Diagnostic software:
EFD_DIAG'cr'
Wait several seconds. The User Port will display:
Diagnostic Test, Press F1 for Help.
>
Enter an ANSI F1 function key character sequence to display the diagnostic main menu:
F1: Help Screen
F2: Transfer Control to Flash Loader
F3: Transfer Control to PDREM Ram
F4: Restore Area 1 Defaults
F5: Restore Area 2 Defaults
1:
2:
3:
4:
5:
6:
7:
Run Ram test
Run NOVRAM cycle power test
Run Chip Select test
Run EFBUS1 to EFBUS2 loopback test
Run EFBUS2 to EFBUS1 loopback test
Run Service Terminal loopback test
Alarm Input Test
To leave the diagnostic tests and return to SNM-1000 operational code, enter an ANSI F4
function key character sequence.
3–58
SNM-1000 Node Control Modem
Operation
Revision 3
MN/SNM1000.IOM
Selecting any menu selection other than “F4” may cause unpredictable
operation of the SNM-1000.
CAUTION
3.7.13.1
Help Screen
To display the menu selection for the Comtech EF Data diagnostics, select menu option
“F1” by entering an ANSI F1.
3.7.13.2
Flash Updates
Select menu option “F2” by entering an ANSI F2. This will begin the flash update
procedure, causing the User Port to display:
> > Xfer Control to Flash Loader
READY FOR FLASH CODE. START ASCII UPLOAD WITH S/W FLOW CONTROL
USE ctrl z KEY TO COMPLETE THE DOWNLOAD OR ctrl c TO ABORT
The SNM-1000 then waits for an Intel hex format software download properly terminated
with an end of record marker.
Using the ASCII file upload utility on the PC terminal emulation program, upload the
appropriate Intel hex file. The User Port will display the following progress messages as
the update proceeds:
Sending Flash Setup Commands ...
Erasing sector
Sending Flash Setup Commands ...
.............................................................................................
When the file transfer to the SNM-1000 has completed, enter ‘CTRL Z’ from the PC
terminal program.
Note: Making any entry other than ‘CTRL Z’ will cause a failure of the file transfer.
If the SNM-1000 FLASH update is successful, the User Port will display:
Flash programming complete
The SNM-1000 will reset and begin to execute SNM-1000 operational code.
3–59
SNM-1000 Node Control Modem
Operation
Revision 3
MN/SNM1000.IOM
The User port will display an error message for any errors that occur during the
programming sequence. Possible error message are listed in the following listing.
DAC FLASH WRITE FAILURE
DAC FLASH ERASE FAILURE
DAC FLASH TIME OUT
DAC FLASH PROGRAMMING FAILURE
Failure in flash programming.
Failure in erasing a Flash sector.
Flash part not responding with the correct
programming status.
An error was found in the upload data.
The download process can be terminated with a ‘CTRL C’.
3.7.13.3
PDREM Ram
To load a RAM-based version of a remote debugger, select menu option “F3” by entering
an ANSI F3.
3.7.13.4
Area1 Defaults
To cause the SNM-1000 to execute SNM-1000 code stored in FLASH AREA 1, select
menu option “F4” by entering an ANSI F4.
3.7.13.5
Area2 Defaults
To cause the SNM-1000 to execute SNM-1000 code stored in FLASH AREA 2, select
menu option “F5” by entering an ANSI F5.
3.7.13.6
Ram Test
To perform a write/read/compare operation on locations 70000H to 7FFFFH of
SNM-1000 DRAM with a 55AA pattern, select menu option “1”.
3.7.13.7
NOVRAM Cycle Power Test “2”
To test the SNM-1000 NOVRAM, perform the following steps.
1. Power up the SNM-1000.
2. Select menu option “2” (NOVRAM test). This test will fail due to the unknown
content of NOVRAM, and will store a pre-set pattern into NOVRAM.
3. Cycle the power and select menu option “2” again. If the test does not pass, the
SNM-1000 NOVRAM has failed.
3–60
SNM-1000 Node Control Modem
Operation
3.7.13.8
Revision 3
MN/SNM1000.IOM
Chip Select Test
To test the SNM-1000 Quad Pack A-D and the 1550 UART, select menu option “3”.
Verify that the User Port displays “Chip Select Test Pass”.
3.7.13.9
Service Terminal Loopback Test
To perform a loopback test of the Service Terminal port using a PC terminal emulation
program, select menu option “6”.
3.7.13.10
EFBUS Loopback Test
Same as above, except select option "4 or "5".
3.7.14
Echo (ECHO)
This command enables/disables echo of characters sent to the SNM-1000 user port.
3.7.14.1
Command Format
ECHO <state>
3.7.14.2
‘ON’ enables character echo
‘OFF’ disables character echo
Local Command Responses
ECHO <state>
3.7.15
Setup Override (SETUP)
This command enables/disables the modem default setup capability on a specified
<channel_no>. When SETUP is enabled, the SNM-1000 remote control channel sends
default modem settings before a data call is configured. If SETUP is disabled, no default
settings are sent to the modem before a data call is configured.
3–61
SNM-1000 Node Control Modem
Operation
3.7.15.1
Revision 3
MN/SNM1000.IOM
Command Format
<channel_no> SETUP <feature_status>'cr'
<channel_no>
<channel_no> is the channel number for the command.
Range: 1 to 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
<feature_status>
'ENABLE' enables the SETUP capability for the selected <channel_no>.
'DISABLE disables the SETUP capability for the selected <channel _no>.
3.7.15.2
Local Command Responses
<channel_no> SETUP<feature_status>
3.7.16
Channel Type (CT)
This command determines the type of channel connected to a given control SNM-1000. It
does not have the capability of determining the modem type of a channel at another node.
3.7.16.1
Command Format
<channel_no> CT'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
CT
Channel type.
3–62
SNM-1000 Node Control Modem
Operation
3.7.16.2
Revision 3
MN/SNM1000.IOM
Local Command Responses
<channel_no> NOT PRESENT
The local channel number does not exist or is disconnected.
<channel_no> DATA <modem_model>
<modem_model> can have the following values:
Modem Model
CiM-550
CiM-300L
CDM-550
CDM-600
SDM-300
SDM-300L2
SDM-300L3
SDM-2020D
SDM-2020M
Code
CiM-550
CiM-300L
CDM-550
CDM-600
SDM-300
SDM-300L2
SDM-300L3
SDM-2020D
SDM-2020M
Modem Model
*SDM-100
*SDM-150
*SDM-6000
*SDM-8000
*SDM-9000
*SDM-140
*SDM-155
Code
SDM-100
SDM-150
SDM-6000
SDM-8000
SDM-9000
SDM-140
SDM-155
*Legacy Modem
3.7.17
Modem Command Sequence (MC)
This command permits the use of the User Port to directly communicate with the
specified external traffic modem being controlled by the SNM-1000. Communication
with the control channel modem is through channel 0 and with traffic modems using the
defined channel number.
Refer to Appendix A for some of the M&C remote commands that can be used with this
command.
3.7.17.1
Command Format
<channel_no> MC 'modem command string''cr'
<channel_no>
Prefix channel number.
Valid range: 0 through 30.
0 for SNM1000
MC
1 through 30 are for traffic modems attached to an SNM-1000, operating in external
traffic mode.
The command string following the 'MC' command is issued directly to the specified
modem. It has the format as shown in the appropriate modem manuals, except that the
leading string through the slash mark (<add/) is eliminated.
3–63
SNM-1000 Node Control Modem
Operation
3.7.17.2
Revision 3
MN/SNM1000.IOM
Local Command Responses
>add/’response’’cr’
Where: ‘add’ = <channel_no>
If the local channel number does not exist or is disconnected, the SNM-1000 returns the
following message:
CHANNEL <channel_no> INVALID
3.7.18
Data Call
The user can initiate a data call by either specifying the destination data channel address
and grade of service information or by specifying a pre-defined circuit id.
3.7.18.1
“Dialed” Data Call (DD)
The user initiates the data call by specifying the destination data channel address and the
desired grade of service.
3.7.18.1.1
Command Format
<channel_no> DD <phone_number> <tx_data> <tx_code> <tx_mod> <origin_clock> <rx_data>
<rx_code><rx_mod> <dest_clock> [<grade_of_service>]'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
DD
Dialed data call.
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
<tx_data> and
<rx_data>
Data rates, defined in kbps.
Step size: 1 bit/s.
Maximum value: 8192.000 kbps.
Examples: 64 is 64 kbps, 64.001 is 64.001 kbps, 1024.1 is 1.0241 Mbit/s, etc.
Note: The decimal point is not required and the entered number is rounded to
the nearest 1 bit/s value.
3–64
SNM-1000 Node Control Modem
Operation
<tx_code> and
<rx_code>
Revision 3
MN/SNM1000.IOM
Codes.
Values:
Code Rates
1/2
2/3
3/4
5/6
7/8
8/9
5/16
21/44
<tx_mod> and
<rx_mod>
Modulation.
Values:
Modulation Type
BPSK
QPSK
OQPSK
8PSK
16QAM
<origin_clock> and
<dest_clock>
3.7.18.2
Code
T
I
S
Optional coding method indicator.
Values:
Coding Method
Viterbi
Sequential
Turbo
3.7.18.1.2
Code
B
Q
O
8
16
Clock Source.
Values:
Clock Source
Terrestrial (TT)
Internal (ST)
Satellite (RT)
<grade_of_service>
Code
1
2
3
5
7
8
A
B
Code
V (default)
S
T
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code> : <description>
Code
9
20
Description
Channel <Channel No.> Invalid
Not enough parameters.
Pre-defined Data Circuit Call (DC)
The user initiates a data call by specifying a pre-defined circuit. The circuit must be
pre-defined at the NMS.
3–65
SNM-1000 Node Control Modem
Operation
3.7.18.2.1
Revision 3
MN/SNM1000.IOM
Command Format
<channel_no> DC <circuit_id>’cr’
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
DC
Pre-defined data circuit call.
<circuit_id>
Pre-defined circuit id at the NMS.
Valid range: 1 through 9999.
3.7.18.2.2
3.7.19
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code> : <description>
Code
9
20
Description
Channel <channel No.> Invalid
Not enough parameters
Terminate (TE)
The terminate command terminates an active call.
3.7.19.1
Command Format
<channel_no> TE'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000,
operating in external traffic mode.
TE
3.7.19.2
Terminate active call.
Local Command Responses
<none>
Command received OK, will be sent to the
NMS.
Error <code> : <description>
Code
9
24
3–66
Description
Channel Invalid
Channel not active
SNM-1000 Node Control Modem
Operation
3.7.20
Revision 3
MN/SNM1000.IOM
Initiate Multipoint Data Call (MI)
This command initiates a multipoint data call on the specified channel. The NMS reports
call status using the CS unsolicited response.
3.7.20.1
Command Format
<channel_no> MI <phone_number> <tx_data> <tx_code> <tx_mod> <origin_clock> <rx_data>
<rx_code><rx_mod> <dest_clock> <encoder_type>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MI
Initiate MultiPoint Data Call
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
<tx_data> and
<rx_data>
Data rates, defined in kbps.
Step size: 1 bit/s.
Maximum value: 8192.000 kbps.
Examples: 64 is 64 kbps, 64.001 is 64.001 kbps, 1024.1 is 1.0241 Mbit/s, etc.
Note: The decimal point is not required and the entered number is rounded to
the nearest 1 bit/s value.
3–67
SNM-1000 Node Control Modem
Operation
<tx_code> and
<rx_code>
Revision 3
MN/SNM1000.IOM
Codes.
Values:
Code Rate
1/2
2/3
3/4
5/6
7/8
8/9
5/16
21/44
<tx_mod> and
<rx_mod>
Modulation.
Values:
Modulation Type
BPSK
QPSK
OQPSK
8PSK
16QAM
<origin_clock> and
<dest_clock>
Code
T
I
S
Optional coding method indicator.
Values:
Coding Method
Viterbi
Sequential
Turbo
3.7.20.2
Code
B
Q
O
8
16
Clock Source.
Values:
Clock Source
Terrestrial (TT)
Internal (ST)
Satellite (RT)
<encoder_type>
Code
1
2
3
5
7
8
A
B
Code
V (default)
S
T
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
2
9
20
3.7.20.3
Description
Bad code rate.
Channel <channel_no> Invalid.
Not enought parameters.
Example
2 MI 12345 19.2 3 q I 19.2 3 q I v
3–68
SNM-1000 Node Control Modem
Operation
3.7.21
Revision 3
MN/SNM1000.IOM
Add Multipoint Data Circuit (MA)
Adds another circuit to multipoint data call, NMS reports results of call using CS
unsolicited response.
3.7.21.1
Command Format
<channel_no> MA<phone_number>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MA
Add MultiPoint Data Call
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
3.7.21.2
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
21
Description
Channel <channel_no> Invalid.
Not enought parameters.
Bad circuit number.
3–69
SNM-1000 Node Control Modem
Operation
3.7.22
Revision 3
MN/SNM1000.IOM
Drop Multipoint Data Circuit (MT)
Drops circuit from multipoint data call, NMS will respond with a CS response to both the
called and the calling nodes.
3.7.22.1
Command Format
<channel_no> MT<phone_number>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MT
Drop MultiPoint Data Call
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
3.7.22.2
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
21
Description
Channel <channel_no> Invalid.
Not enought parameters.
Bad circuit number.
3–70
SNM-1000 Node Control Modem
Operation
3.7.23
Revision 3
MN/SNM1000.IOM
Change Forward Channel for Multipoint Data Circuit (MF)
Changes the forward channel for a data call in progress.
3.7.23.1
Command Format
<channel_no> MF<phone_number>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MF
Change forward channel
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-', '('
or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
3.7.23.2
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
21
Description
Channel <channel_no> Invalid.
Not enought parameters.
Bad circuit number.
3–71
SNM-1000 Node Control Modem
Operation
3.7.24
Revision 3
MN/SNM1000.IOM
Change Return Channel for Multipoint Data Circuit (MR)
Changes return channel for a multipoint data call.
3.7.24.1
Command Format
<channel_no> MR <option><phone_number>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MR
Change Return Channel
<option>
Option
0
1
<phone_number>
Destination data channel address (phone number).
Description
Turn return channel off.
Return channel request, phone number follows.
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
3.7.24.2
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
21
44
Description
Channel <channel_no> Invalid.
Not enough parameters.
Bad circuit number.
Bad fields or number of parameters, invalid option.
3–72
SNM-1000 Node Control Modem
Operation
3.7.25
Revision 3
MN/SNM1000.IOM
Send Message to Multipoint Data Circuit Originator (MO)
Sends a message to the originator of a multipoint data circuit.
3.7.25.1
Command Format
<channel_no> MO <message>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
MO
Send message to originator
<message>
Message
Max. length: 28 characters..
3.7.25.2
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
Description
Channel <channel_no> Invalid.
Not enough parameters.
3–73
SNM-1000 Node Control Modem
Operation
3.7.26
Revision 3
MN/SNM1000.IOM
Send message to Multipoint Data Circuit Listener (ML)
Changes the return channel for a multipoint data call.
3.7.26.1
Command Format
<channel_no> ML<phone_number> <message>'cr'
<channel_no>
Prefix channel number.
Valid range: 1 through 30.
1 through 30 are for traffic modems attached to an SNM-1000, operating in
external traffic mode.
ML
Send message to specified listener
<phone_number>
Destination data channel address (phone number).
Max. length: 32 characters.
Valid characters: '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '*', '#', 'A', 'B', 'C', 'D', '-',
'(' or ')'
Note: The '-' and '('or')' characters are not part of the number and are used to
increase readability. They are stripped out and not passed to the NMS.
<message>
Message
Max. length: 13 characters..
3.7.26.2
3.7.27
Local Command Responses
<none>
Command received OK, will be sent to the NMS.
Error <code>: <description> <cr><lf>
Code
9
20
Description
Channel <channel_no> Invalid.
Not enought parameters.
Port Redirection
The operation of the User Port may be switched to the Service Port mode. The Service
Port operation contains information to be used for debugging purposes. To redirect the
User Port to the Service Port type:
'!<cr>'
3–74
SNM-1000 Node Control Modem
Operation
3.7.28
Revision 3
MN/SNM1000.IOM
Debugging with the User Port
Debug messages at the user/service port can be enabled and disabled.
3.7.28.1
Command Format
DEB
Example:
User Port > DEB
DAC debug commands:
1: SYS debug
2: MSG debug
4: HDLC debug
5: C/SDAC debug
7: DICA debug
8: VFDU debug
User Port >
3.7.28.2
3: ROUTER debug
6: MODEM debug
9: DTCP debug
Initiate Modem Command Debug
Enter “DEB 6” to display the Modem debug submenus:
User Port > DEB 6
MODEM debug:
1:sdmMsg=0, 2:mcpMsg=0,
User Port >
To enable l:sdmMsg, enter “DEB 6 1 1.”
User Port > DEB 6 1 1
MODEM debug:
1:sdmMsg=1, 2:mcpMsg=0,
User Port >
IMPORTANT
Notice that sdmMsg=1 (enabled). The redirection command described
in Section 3.2.27 can be used to toggle the display of messages On or
Off.
3–75
SNM-1000 Node Control Modem
Operation
Revision 3
MN/SNM1000.IOM
This page is intentionally left blank.
3–76
Chapter 4. THEORY OF OPERATION
This chapter describes the theory of operation for the following printed circuit boards
(PCBs) contained in the SNM-1000.
•
•
•
•
4.1
DAC
Monitor & Control (M&C) Board
Modulator
Demodulator
Demand Assignment Controller (DAC)
The DAC performs DAMA control inbound/outbound functions within the SNM-1000.
The DAC is capable of remotely controlling in-circuit reconfiguration of the DAMA
microcontroller code. The DAC performs the following functions:
•
•
•
•
•
•
•
Decodes a network control HDLC encoded data stream from the demodulator
Encodes a burst signal using HDLC encoding
Synchronizes transmit burst to control slot time
Controls the data interface
Controls the modem M&C board via a serial link
Supports two EIA-232 user interface ports
Supports two EIA-485 interface ports
The SNM-1000 interfaces with the DAC through an interface bus connector. Eleven
external and internal interfaces are provided as permanent installations on the DAC
board.
A block diagram of the DAC is shown in Figure 4-1.
4–1
Jb
10 PIN HEADER
CABLED TO / FROM
J6
DB9
REAR PANEL
USER/DATA
PORT
9PIN Mini DIN
CONNECTOR
4–2
EF BUS1
2 wire RS485, up to 115Kbit/S
EF BUS1
2 wire RS485, up to 115Kbit/S
USER DATA/
CONTROL
USER DATA/CONTROL
DCE, RS 232, 19.2Kbit/s
RS485
LEVEL
TRANSLATION
QUAD
UART
(one half of
16C554)
PERSONALITY
MODULE
USER
PORT
80386
RS232
LEVEL
TRANSLATION
QUAD
UART
(one half
of
16C554)
DRAM
512K
bytes
50MHZ
CPU CLK
USER DATA/CONTROL
DCE, RS 232, 19.2Kbit/s
NONVOLATILE
RAM
2K x 8
J8
Figure 4-1. DAC Block Diagram
SEGMENTED
FLASH
512kBYTES
INTERNAL
UARTS
HDLC
CONTROLLER
(on half of
Z85230
M & C serial interface 19.2Kbit/s
J2
(part of J1)
96 PIN
CONNECTOR
to / from
modem
RS232
LEVEL
TRANSLATION
HDLC
CONTROLLER
(one half of
Z85230)
RX DATA
TX
CONTROL
HDLC RS232
RX CONTROL
TX CONTROL
TX
DATA
J5
J1
10 PIN HEADER
DEBUGGER
TEST PORT
(part of J1)
96 PIN
CONNECTOR
TO / FROM
MODEM
SNM-1000 Node Control Modem
Theory of Operation
Revision 3
MN/SNM1000.IOM
SNM-1000 Node Control Modem
Theory of Operation
4.1.1
Revision 3
MN/SNM1000.IOM
Specifications
Refer to the following listing for specifications.
Physical Size
Power Requirements
Operating Temperature
4.1.2
5.3 x 7 inches (13.46 x 17.78 cm)
The DAC board fits into the SNM-1000 1RU chassis.
+5 VDC
0 to +50° C (32 to 122° F)
Theory of Operation
To ensure a high level of integration, the DAC uses the Intel 80386EX embedded
microcontroller. This 16/32 bit microcontroller performs DAMA controller functions
(and other functions) under control of a real time, multi-tasking operating system.
The DAC uses non-volatile configuration memory with unlimited read/write access to
satisfy memory reconfiguration requirements. Flash ROM is used for program storage.
NVRAM storage maintains the configuration parameters during power-down conditions.
HDLC synchronous serial ports are implemented with a Z85230 serial communications
controller device. This device supports the SNM-1000 control channel satellite channel
interface and the HDLC external serial port.
The 80386EX DMA channels are used for the satellite channel interface receive
functions. Additional asynchronous ports are implemented with 16C450/16C550
compatible UART devices, to provide monitor and control of modems under SNM-1000
control, via either the SNM-1000 microcontroller or a PC.
4.1.2.1
User Port
The User port serial interface is a 9-pin mini-DIN female connector (DCE) on the rear
panel of the SNM-1000. The interface operates at 19.2 kbit/s, 8 data bits, no parity, 1 stop
bit. The interface levels are EIA-232. The interface allows the user to configure the
SNM-1000 and to request the establishment and termination of data circuits.
Note: Refer to the following sections for a description of the software communications
parameters and detailed message format information.
Paragraph
No.
3.5
Appendix A
Nomenclature
User Port Operation
Remote Control Operation
4–3
Description
Functional parameters for DAMA
enviroment.
External traffic modem
communications.
SNM-1000 Node Control Modem
Theory of Operation
4.1.3
Revision 3
MN/SNM1000.IOM
EFBUS1/2 Port (External)
The EFBUS 1/2 port combines EFBUS1 and EFBUS2 onto a common connector at J6, a
10-pin header. The EFBUS port provides two separate 2-wire EIA-485 interfaces wired to
a common 9-pin D female connector located on the rear of the MIDAS modem. The IF
Modulator and IF Demodulator status is also presented for external use.
The Modem Control serial port, EFBUS1, is used for control of other Comtech EF Data
traffic modems. The signals are described in the following table with signal names having
the MC prefix. The interface is ASYNC, EIA-485/2-wire, and 19.2 kbps.
The EFBUS2 port is reserved for communication with future MIDAS traffic modems.
Signal Function
Ground
Demodulator fault
Modulator fault
Receive/Transmit +
Receive/Transmit Receive/Transmit+
Receive/TransmitGround
Not used
Not used
4.1.4
Name
MCGND
BP_DF
BP_MF
MS_RD/SD+(EFBUS2)
MS_RD/SD-(EFBUS2)
MC_RD/SD+(EFBUS1)
MC_RD/SD-(EFBUS1)
MSGND
-
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
J6 EFBUS
10-Pin
Header
1
3
5
7
9
2
4
6
8
10
J2 VFDU
Interface
96-Pin
NC
NC
NC
B14
C14
NC
NC
MIDAS
Conn
Pin #
1
2
3
4
5
6
7
8
9
-
Signal
Level
TTL
TTL
EIA-485
EIA-485
EIA-485
EIA-485
-
Monitor and Control
The modem uses a sophisticated microcontroller module to perform M&C functions. This
module is located on the demodulator board. The M&C monitors the modem and
provides configuration updates to other modules within the modem as required.
The modem configuration parameters are maintained in battery-backed RAM. The RAM
provides for total recovery after a power-down situation.
Notes:
1. Extensive fault monitoring and status gathering are provided.
2. Modem functions are accessible through a user port interface.
4–4
SNM-1000 Node Control Modem
Theory of Operation
4.1.5
Revision 3
MN/SNM1000.IOM
Non-Volatile Memory
Non-volatile memory on the M&C module allows it to retain configuration information
without prime power for at least one year. Should the modem be powered down, the
following sequence is carried out when power is reapplied to the M&C:
1. The microcontroller checks the non-volatile memory RAM to see if data has been
retained. If data has been retained, the modem is reconfigured to that information.
2. If non-volatile memory fails the data test, a default configuration from ROM is
loaded into the system.
4.1.6
User Port
Modem functions can be remotely controlled and monitored via the User port on the back
panel. Refer to Section 3.5 and Appendix A.
4.1.7
M&C Theory of Operation
The M&C module is built around the Intel 80C32 microcontroller, operating at
11.0592 MHz. The microsystem is designed to support up to 512 kilobytes (Kb) of
read-only code memory, and up to 32 Kb of non-volatile, random-access data memory.
4–5
SNM-1000 Node Control Modem
Theory of Operation
4.2
Revision 3
MN/SNM1000.IOM
Modulator
The SNM-1000 modulator performs filtered Quadrature Phase Shift Keying (QPSK)
modulation onto a variable frequency/amplitude carrier. The modulator also provides the
following functions:
•
•
•
•
•
Encodes data for the appropriate decoder
Scrambles data
Monitors and displays the modulator status without interrupting service
Provides source control timing
Appends a burst preamble for detection by the demodulator (burst mode)
The SNM-1000 creates a QPSK modulated carrier within the 50 through 180 MHz range
from the digital data stream provided by the interface section.
The following subsections make up the modulator:
•
•
•
•
•
•
•
Scrambler
Convolutional encoder
Preamble and postamble generator (burst mode only)
Modulator
Output amplifier
RF synthesizer
SCT synthesizer
A block diagram of the modulator is shown in Figure 4-2.
4–6
SNM-1000 Node Control Modem
Theory of Operation
DATA
CLK
Revision 3
MN/SNM1000.IOM
INTERFACE
SCT
PLL
OPTIONAL
SCT
MONITOR
&
CONTROL
CONVOLUTIONAL
ENCODER
REFERENCE
LO
BPF
DIGITAL
SIGNAL
PROCESSING
BPF
POWER LEVEL
CONTROL
LPF
RF
OUTPUT
RF LOOPBACK
OUTPUT
Figure 4-2. Modulator Block Diagram
4–7
SNM-1000 Node Control Modem
Theory of Operation
4.2.1
Revision 3
MN/SNM1000.IOM
Theory of Operation
The modulator is composed of two basic sections: the baseband processing section, and
the RF section. The modem M&C controls all programmable functions in both sections.
4.2.1.1
Burst Mode
When a transmission is initiated, the modulator issues a pure carrier for 96 clock cycles,
followed by a clock training sequence for 352 clock cycles. A 31-bit unique word is then
transmitted. The user data is transmitted into the modem. When the modulator detects the
end of the user data stream, the modulator flushes the convolutional encoder (6 bits), then
transmits the unique word prime twice (62 bits). The packet is complete and the
modulator is ready for the next packet.
Data to be transmitted comes from the DAC. At this point, the data signal is clean and
free of jitter. The data signal goes to the scrambler, which provides energy dispersal.
There is no need for a differential encoder in burst mode, as the ambiguities are resolved
using the unique word. The data signal passes to the 1/2 rate Viterbi K=7 convolutional
encoder.
The output of the encoder generates two separate data streams to drive the in-phase and
quadrature channels of the modulator. The data signal passes through a set of variablerate digital Nyquist filters. There are activity detectors on both the In-phase and
Quadrature (I&Q) channel Nyquist filters.
The digital Nyquist filters are followed by Digital-to-Analog converters and
reconstruction filters. These filters provide proper spectral shaping and equalization. The
filters are under control of the M&C.
The I&Q filtered data signals are applied to the RF modulator, which converts them to a
modulated carrier. The spectral shape is identical to that of the input data streams, but is
double-sided about the carrier frequency.
The RF synthesizer provides the proper frequencies to convert the modulator IF to the
desired output frequency in the 50 through 180 MHz range. The synthesizer has multiple
loops, and incorporates a Direct Digital Synthesis (DDS) chip to accommodate 100 Hz
steps over a range of 130 MHz. The RF section has a frequency stability of ± 1 x 10-5.
The signal from the power combiner is sent to the output amplifier, which amplifies the
low-level signal from the modulator section to the proper level for output from the
module. The amplifier contains circuitry which provides programmable control of the
output level over a range of -5.0 to -30.0 dBm, in 0.1 dB graduated steps. Power leveling
is provided at ± 1.0 dB to maintain the stability of the output level over time and
temperature.
4–8
SNM-1000 Node Control Modem
Theory of Operation
4.2.2
Revision 3
MN/SNM1000.IOM
Theory of Modulation Types
The modulation type for the modem is QPSK.
The PSK data transmission encoding method uses the phase modulation technique. This
method varies the phase angle of the carrier wave to represent a different bit value for the
receiver.
•
4.2.2.1
QPSK represents: 4 discrete phase angles represent the 4 possible states of a
symbol.
QPSK Encoding
The modulator converts transmitted baseband data into a modulated QPSK carrier at the
following parameters:
•
19.2 kbit/s (1/2 rate)
Using vector analysis of the constellation pattern, QPSK represents a symbol with the
carrier phase angle at 45°, 135°, 225°, or 315°. The 1/2 rate encoded at the convolutional
encoder provide the desired input/output bit rates.
Code Rate
1/2
4.2.3
Symbols/Bit
2
Modulator Specifications
Refer to Chapter 1 for specifications.
4–9
Bits/Hz
1
SNM-1000 Node Control Modem
Theory of Operation
4.3
Revision 3
MN/SNM1000.IOM
Demodulator
The demodulator converts PSK modulated carriers within the 50 to 180 MHz range to a
demodulated baseband data stream. The converted modulation type is QPSK, (refer to
Section 4.2.3 for a description of modulation type). The demodulator then performs FEC
on the data stream using the Viterbi decoding algorithm.
A block diagram of the demodulator is shown in Figure 4-3.
LOOPBACK
RF INPUT
SWITCH
AGC
LPF
BPF
LO #1
LO #2
BPF
RF INPUT
50 TO 180 MHz
REF
VCXO
OC XO
OPT
HIGH
STABILITY
A TO D
CONVERTER
REFERENCE
REF
PLL
DIGITAL
SIGNAL
PROCESSING
VITERBI
DECODER
DIGITAL
CLOCK
RECOVERYLOOP
EXT REFERENCE
DOPPLER/
PLESIOCHRONOUS
BUFFER
Figure 4-3. Demodulator Block Diagram
4–10
INTERFACE
SNM-1000 Node Control Modem
Theory of Operation
4.3.1
Revision 3
MN/SNM1000.IOM
Theory of Operation
The demodulator card functions as an advanced, fully digital, coherent phase-lock
receiver, and a Viterbi decoder.
4.3.1.1
Continuous Mode
The demodulator consists of the following subsections:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
RF synthesizer
IF amplifier
Quadrature demodulator
Identical anti-aliasing filters
Analog-to-Digital converters
Digital Nyquist filters
Costas loop
Clock loop
AGC
AOC
Ambiguity resolver
Soft-decision decoder
V.35 descrambler
BER monitor
The modulated signal enters the RF module, where it is converted from an IF signal at
50 through 180 MHz to I&Q baseband channels. The synthesizer has multiple loops, and
incorporates a DDS chip to accommodate 100 Hz steps over a range of 130 MHz. The RF
section has a frequency stability of ± 1 x 10-5.
The two channels are then passed through identical anti-aliasing filters Analog-to-Digital
converters, and digital Nyquist filters. The result is a filtered, digital representation of the
received signal. A Costas loop maintains the phase lock during the message. A phaselock loop maintains the data clock. The soft-decision mapper converts the I&Q samples
to soft-decision values. The soft-decision values are then fed to the Viterbi decoder where
error detection and correction are performed.
The I&Q channels also are used to calculate the AGC and AOC voltages. The AGC and
AOC are fed back to the RF module.
The data from the output of the Viterbi decoder is descrambled with a V.35 descrambler,
and routed to the interface card. Additionally, a summary fault relay provides a FORM C
output located on the demodulator board.
During acquisition, the demodulator sweeps the range around the nominal IF frequency.
These parameters (sweep width and offset) can be set by the user. As the demodulator
sweeps through a carrier, the data is fed to the selected decoder, which resolves the
4–11
SNM-1000 Node Control Modem
Theory of Operation
Revision 3
MN/SNM1000.IOM
ambiguities of the incoming data. When the decoder generates a lock signal, the
demodulator stops sweeping. If the signal level is within the operating range of the
demodulator, the modem declares lock.
Notes:
1. After the demodulator is locked, BER and frequency offset monitoring are
available via the remote interface.
2. For QPSK applications, the demodulator has the ability to lock to a carrier that
has gone through a spectral inversion.
4.3.2
Demodulator Specifications
Refer to Chapter 1 for specifications.
4–12
Chapter 5. MAINTENANCE
This chapter provides the following information:
•
5.1
Fault isolation
Fault Isolation
CAUTION
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
The fault isolation procedure lists the following categories of faults or alarms.
•
•
•
•
•
Modulator
Demodulator
Transmit Interface
Receive Interface
Common Equipment
Note: Each fault or alarm category includes possible problems and the appropriate action
required to repair the modem.
5–1
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
If any of the troubleshooting procedures mentioned earlier in this chapter do not isolate
the problem, and Comtech EF Data Customer Support assistance is necessary, have the
following information available for the representative:
5.1.1
•
Modem configuration. Modem configuration includes the modulator,
demodulator, and interface.
•
Faults (active or stored).
System Faults/Alarms
System faults are reported in the “Faults/Alarms” menu, and stored faults are reported in
the “Stored Flts/Alms” menu. Refer to Chapter 3 for more information.
5–2
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
Table 5-1. SNM-1000 Fault Tree
T
X
T
X
R
X
I
F
F
A
U
L
T
F
A
U
L
T
R
E
L
A
Y
R
E
L
A
Y
O
U
T
P
U
T
O
F
F
F
A
U
L
T
L
E
D
C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
R
X
A
L
A
R
M
A
L
A
R
M
R
E
L
A
Y
R
E
L
A
Y
#
2
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1
(1)
MODULATOR FAULTS
IF SYNTHESIZER
DATA CLOCK SYN
I CHANNEL
Q CHANNEL
AGC
MODEM REF ACT
MODEM REF PLL
MODULE
CONFIGURATION
DEMODULATOR FAULTS
CARRIER DETECT
IF SYNTHESIZER
I CHANNEL
Q CHANNEL
BER THRESHOLD
MODULE
CONFIGURATION
*
**
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(2)
(3)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(4)
(5)
P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
(6)
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
I
B
S
B
A
C
K
W
A
R
D
A
L
A
R
M
(7)
M
A
I
N
A
L
A
R
M
(8)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Legend
Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
Pin 4 (NO), 5 (COM), 6 (NC) *
2
RX FAULT
Pin 7 (NO), 8 (COM), 9 (NC) *
3
COM EQ FAULT
Pin 1 (NO), 2 (COM), 3 (NC) *
4
TX ALARM #2
Pin 4 (NO), 5 (COM), 6 (NC) *
5
RX ALARM #3
Pin 7 (NO), 8 (COM), 9 (NC) *
6
PRIMARY ALARM
Pin 43 (NO), 10 (COM), 27 (NC) *
7
SECONDARY ALARM
Pin 44 (NO), 11 (COM), 28 (NC) *
8
DEF MAINT ALARM
Pin 17 **
A connection between the common and N.O. contacts indicate no fault/alarm.
Signal is open collector high impedance if faulted.
5–3
D
E
F
E
R
R
E
D
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
Table 5-1. SNM-1000 Fault Tree (Continued)
T
X
T
X
R
X
I
F
F
A
U
L
T
F
A
U
L
T
R
E
L
A
Y
R
E
L
A
Y
O
U
T
P
U
T
O
F
F
F
A
U
L
T
L
E
D
C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
R
X
A
L
A
R
M
A
L
A
R
M
R
E
L
A
Y
R
E
L
A
Y
#
2
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1
(1)
TX INTERFACE FAULTS
TX DROP
TX DATA/AIS
TX CLK PLL
TX CLK ACTIVITY
TX AUDIO 1 CLIP
TX AUDIO 2 CLIP
CONFIGURATION
RX INTERFACE FAULTS
BUFFER UNDERFLOW
BUFFER OVERFLOW
RX DATA/AIS
FRAME BER
BACKWARD ALARM
BUFFER CLK PLL
BUFFER CLK ACT
DEMUX LOCK
RX 2047 LOCK
BUFFER FULL
RX INSERT
RX AUDIO 1 CLIP
RX AUDIO 2 CLIP
CONFIGURATION
(2)
(3)
(4)
(5)
P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
(6)
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
I
B
S
B
A
C
K
W
A
R
D
A
L
A
R
M
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
(7)
(8)
X
X
Not Applicable
X
X
X
X
X
Not Applicable
Not Applicable
X
X
X
X
X
X
X
X
X
X
X
Not Applicable
X
X
Not Applicable
Not Applicable
Not Applicable
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Legend
Test Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
Pin 4 (NO), 5 (COM), 6 (NC) *
2
RX FAULT
Pin 7 (NO), 8 (COM), 9 (NC) *
3
COM EQ FAULT
Pin 1 (NO), 2 (COM), 3 (NC) *
4
TX ALARM #2
Pin 4 (NO), 5 (COM), 6 (NC) *
5
RX ALARM #3
Pin 7 (NO), 8 (COM), 9 (NC) *
6
PRIMARY ALARM
Pin 43 (NO), 10 (COM), 27 (NC) *
7
SECONDARY ALARM
Pin 44 (NO), 11 (COM), 28 (NC) *
8
DEF MAINT ALARM
Pin 17 **
*
A connection between the common and N.O. contacts indicate no fault/alarm.
**
Signal is open collector high impedance if faulted.
5–4
X
X
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
Table 5-1. SNM-1000 Fault Tree (Continued)
T
X
T
X
R
X
I
F
F
A
U
L
T
F
A
U
L
T
R
E
L
A
Y
R
E
L
A
Y
O
U
T
P
U
T
O
F
F
F
A
U
L
T
L
E
D
C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
R
X
A
L
A
R
M
A
L
A
R
M
R
E
L
A
Y
R
E
L
A
Y
#
2
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1
(1)
COMMON EQUIP FAULTS
BATTERY/CLOCK
-12V POWER SUPPLY
+12V POWER SUPPLY
+5V SUPPLY
SELF TEST
CONTROLLER
INTERFACE MODULE
(2)
(3)
(4)
(5)
P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
(6)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
B
A
C
K
W
A
R
D
A
L
A
R
M
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
(7)
(8)
X
X
Not Applicable
Legend
Test Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
Pin 4 (NO), 5 (COM), 6 (NC) *
2
RX FAULT
Pin 7 (NO), 8 (COM), 9 (NC) *
3
COM EQ FAULT
Pin 1 (NO), 2 (COM), 3 (NC) *
4
TX ALARM #2
Pin 4 (NO), 5 (COM), 6 (NC) *
5
RX ALARM #3
Pin 7 (NO), 8 (COM), 9 (NC) *
6
PRIMARY ALARM
Pin 43 (NO), 10 (COM), 27 (NC) *
7
SECONDARY ALARM
Pin 44 (NO), 11 (COM), 28 (NC) *
8
DEF MAINT ALARM
Pin 17 **
*
A connection between the common and N.O. contacts indicate no fault/alarm.
**
Signal is open collector high impedance if faulted.
5–5
I
B
S
SNM-1000 Node Control Modem
Maintenance
5.1.2
Revision 3
MN/SNM1000.IOM
Faults/Alarms Display
General fault, status, and alarm information are indicated by 8 LEDs located on the
modem’s front panel.
•
A fault (red LED) indicates a fault that currently exists in the modem.
•
When a fault occurs, it is stored in the stored fault memory, and indicated by the
single red LED.
•
The LED is turned off when the fault clears. If the fault clears, the occurrence is
also stored.
A total of 10 occurrences of any fault can be stored. Each fault or stored fault indicated
by a front panel LED could be one of many faults. To determine which fault has
occurred, use the Fault or Stored Fault front panel menu. Refer to Chapter 3 for
information on the Fault or Stored Fault front panel menu.
Alarms are considered minor faults which will not switch the modem offline in a
redundant system. Alarms are shown in the Fault or Stored Fault front panel menu by a
reversed contrast (white on black) character that appears at the display panel.
5.1.3
Faults/Alarms Analysis
This section describes the possible problems and actions to take for the following faults:
•
•
•
•
•
Modulator
Demodulator
Transmit interface
Receive interface
Common equipment
5–6
SNM-1000 Node Control Modem
Maintenance
5.1.3.1
Revision 3
MN/SNM1000.IOM
Modulator Faults
Fault/Alarm
IF SYNTHESIZER
Possible Problem and Action
Modulator IF synthesizer fault.
DATA CLOCK SYN
This is considered a major alarm, and will turn off the modulator
output. Return the modem for repair.
Transmit data clock synthesizer fault.
I CHANNEL
This fault indicates that the internal clock VCO has not locked to the
incoming data clock, or the internal clock synthesizer has not locked
to the internal reference. This is considered a major alarm, and will
turn off the modulator output. Ensure the proper data rate has been
set up and selected, and the incoming data rate matches the modem
selections.
Activity alarm for the I channel digital filter.
Q CHANNEL
This alarm is considered a major alarm, and will turn off the
modulator IF output. An alarm in this position indicates either a fault
in the scrambler, or if the scrambler is disabled, the alarm indicates a
loss of incoming data. If the fault is active with the scrambler turned
off, check for input data at the DATA I/O connector.
Activity alarm for the Q channel digital filter.
AGC LEVEL
Use the I channel procedure.
Output power AGC level fault.
INTERNAL SCT SYN
Indicates the level at the modulator output is not the programmed
level.
Internal TX data clock synthesizer fault.
EXT REF ACT
The SCT has failed to lock to the internal reference.
External reference activity fault.
MODULE
Indicates clock reference not detected.
Modulator module fault.
Typically indicates that the modulator module is missing or will not
program.
5–7
SNM-1000 Node Control Modem
Maintenance
5.1.3.1.1
Revision 3
MN/SNM1000.IOM
Modulator Checkout
Use the following procedure to check out the modulator:
1. Set up the equipment. Refer to Chapter 4 for modulator specifications.
2. Set up the modem for operation by using the Configuration Modulator and
Demodulator front panel menus.
3. Clear all TX faults by correct use of data and clock selection (Chapter 4).
4. Measure the Eb/N0 with a receiver that is known to be properly operating. Refer
to Table 5-2.
5. Check for proper Eb/N0 level. The (S+N)/N is measured by taking the average
level of the noise and the average level of the modem spectrum top. Use this
measurement for the first column.
6. Read across the page to find the S/N and Eb/N0 for the specific code rate. Once
the demodulator has locked to the incoming signal, the Monitor menu will
display signal level, raw BER, corrected BER, and Eb/N0. Refer to Chapter 1 for
examples of BER performance curves.
7. Connect a spectrum analyzer to the modem. Ensure the IF output meets the
appropriate mask and spurious specifications. Measure the power output at
different levels and frequencies.
A typical output spectrum is shown in Figure 5-1 and Figure 5-2.
8. To check the frequency and phase modulation accuracy:
a. Set the modem to the continuous wave Normal mode by using the Carrier
Mode front panel menu (Chapter 3). This sets the Carrier mode in the off
condition. A pure carrier should now be present at the IF output. This should
only be used for frequency measurements. In this mode, spurious and power
measurements will be inaccurate.
b. Set the modem to the continuous wave Offset mode by using the Carrier
Mode front panel menu (Chapter 3). This generates a single, upper
side-band-suppressed carrier signal. Ensure the carrier and side-band
suppression is < -35 dBc.
5–8
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
Table 5-2. Conversion to S/N and Eb/N0 Chart
(dB)
(S+N)/N
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
Code
S/N
1.8
2.6
3.3
4.1
4.7
5.4
6.0
6.6
7.3
7.8
8.4
9.0
9.5
10.1
10.6
11.2
11.7
12.2
12.8
13.3
13.8
14.3
14.9
15.4
15.9
16.4
16.9
17.4
17.9
18.4
18.9
19.5
20.0
5–9
Rate 1/2
Eb/N0
1.8
2.6
3.3
4.1
4.7
5.4
6.0
6.6
7.3
7.8
8.4
9.0
9.5
10.1
10.6
11.2
11.7
12.2
12.8
13.3
13.8
14.3
14.9
15.4
15.9
16.4
16.9
17.4
17.9
18.4
18.9
19.5
20.0
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
RL -49.00 dBm
ATTEN 10 dB
2.00 dB/DIV
RES BANDWIDTH
10.0 kHz
Modem Rate = 2144 kbit/s, 3/4 Rate Coding
with 7.7 dB Eb/No (S + N)/N = 10 dB
CENTER 70.000 MHz
*RB 10.0 kHz
*VB 10.0 Hz
SPAN 1.000 MHz
ST 30.00 sec
Figure 5-1. Typical Output Spectrum (with Noise)
RL -20.29 dBm
ATTEN 10 dB
5.00 dB/DIV
PASS
CENTER FREQUENCY
140.000 MHz
CENTER 140.000 MHz
*RB 30.0 kHz
*VB 3.00 Hz
SPAN 5.000 MHz
ST 166.7 sec
Figure 5-2. Typical Output Spectrum (without Noise)
5–10
SNM-1000 Node Control Modem
Maintenance
5.1.3.2
Revision 3
MN/SNM1000.IOM
Demodulator Faults
Fault/Alarm
CARRIER DETECT
Possible Problem and Action
Carrier detect fault.
Indicates the decoder is not locked. This is the most common fault
displayed in the modem. Any problem from the input data on the
modulator end of the circuit to the output of the decoder can cause this
alarm.
IF SYNTHESIZER
First, ensure the demodulator has an RF input at the proper frequency
and power level. Ensure the demodulator data rate is properly
programmed. Refer to the fault isolation procedure for Data Clock Syn
in the modulator section. Verify the frequency of the data transmitted
from the modulator is within 100 PPM.
Demodulator IF synthesizer fault.
Indicates the demodulator IF synthesizer is faulted.
I CHANNEL
Q CHANNEL
This fault is a hardware failure. Contact the Comtech EF Data Customer
Support Department.
Indicates a loss of activity in the I channel of the quadrature
demodulator.
Typically indicates a problem in the modulator side of the circuit. Check
for proper RF input to the demodulator. If the input to the demodulator
is correct, then the problem is in the baseband processing.
Indicates a loss of activity in the Q channel of the quadrature
demodulator.
BER THRESHOLD
Follow the same procedure for the I channel fault.
Indicates the preset BER threshold has been exceeded.
MODULE
Setting of this alarm is done in the Utility menu. This is an alarm based
on the corrected BER reading on the front panel.
Demodulator module fault.
Typically indicates that the demodulator module is missing or will not
program. Contact the Comtech EF Data Customer Support Department.
5–11
SNM-1000 Node Control Modem
Maintenance
5.1.3.2.1
Revision 3
MN/SNM1000.IOM
Demodulator Checkout
Use the following procedure to test the demodulator.
1. Set up the equipment. Refer to Chapter 4 for the demodulator specifications.
2. Set up the modem with an external IF loop and level. Use a properly operating
modulator, and ensure that power levels, data rates, code rates, etc., are
compatible.
3. Allow the modem to lock up. Depending on the data rate and overhead type,
lock up may take several seconds. When the green carrier detect LED is on and
the DEMUX lock fault has been cleared (where applicable), the modem will run
at the specified error rate. Run the TX power level (input amplitude) over the full
range, and offset the TX frequency from the RX frequency by 35 kHz. Ensure the
modem still runs within the specified error rate.
4. Set up the modem to check the constellation patterns with an oscilloscope that is
set in the X-Y mode. Typical constellation patterns with noise and without noise.
These test points are available on the auxiliary connector (J9, pins 6 and 8). It is
not necessary to open the modem to look at these test points.
5–12
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
WITH NOISE
WITHOUT NOISE
Figure 5-3. Typical Eye Constellations
5–13
SNM-1000 Node Control Modem
Maintenance
5.1.3.3
Revision 3
MN/SNM1000.IOM
Transmit Interface Faults
Fault/Alarm
TX DROP
TX DATA/AIS
Possible Problem and Action
Not Applicable
Data or incoming AIS.
TX CLOCK PLL
When the AIS is selected in the Interface Utility menu for TX data
fault, the transmit interface fault TX data/AIS is monitoring a fault
condition of all 1s from customer data input to the modem. When data
is selected in the Interface Utility menu for TX data fault, the TX
interface fault TX data/AIS is monitoring a fault condition of all 1s or
0s. This is referred to as a data-stable condition (data is not
transitioning). This fault indicates there is trouble in the chain sending
data to the modem. The modem passes this signal transparently, and
takes no other action. This indication is a monitor function only, and
aids in isolating the trouble source in a system.
Transmitter phase-locked loop fault.
TX CLOCK ACT
Indicates the transmitter PLL is not locked to the reference of the
interface transmit clock recovery oscillator. Contact the Comtech EF
Data Customer Support Department.
Activity detector alarm of the selected interface transmit clock.
TX AUDIO 1 CLIP
TX AUDIO 2 CLIP
CONFIGURATION
Indicates the selected TX clock is not being detected. Check the signal
of the selected TX clock source to verify the signal is present. The
interface will fall back to the internal clock when this alarm is active.
Not Applicable
Not Applicable
Configuration fault.
Indicates the selected TX Output , Fault Relay, or Fault LED is not
functioning. Check the signal of the selected TX source to verify the
signal is present. The configuration will fall back to the default when
this alarm is active.
5–14
SNM-1000 Node Control Modem
Maintenance
5.1.3.4
Revision 3
MN/SNM1000.IOM
Receive Interface Faults
Fault/Alarm
BUFFER UNDERFLOW
Possible Problem and Action
Buffer underflow alarm.
BUFFER OVERFLOW
Indicates the plesiochronous buffer has underflowed. Buffer underflow
is normally a momentary fault (there are clock problems if this alarm is
continuously present). This alarm is included in this section to be
consistent with the fault reporting system and to be correctly registered
in the stored fault memory. The time and date of the first 10 receive
buffer underflow faults are stored in battery-backed memory as an aid
to troubleshooting. The interval between stored overflow/underflow
events can be used to determine relative clock accuracies.
Buffer overflow alarm.
Indicates the plesiochronous buffer has overflowed.
RX DATA/AIS
FRAME BER
BACKWARD ALARM
The problems and actions in the buffer underflow section apply to this
alarm.
Data or incoming AIS. The data monitored for RX data is coming from
the satellite.
When the AIS is selected for RX data fault in the Interface Utility
menu, the RX data/AIS is monitoring an alarm condition of all 1s from
the satellite. When data is selected for RX data fault in the Interface
Utility menu, the RX data/AIS is monitoring a fault condition of all 1s
or 0s. This is referred to as a data-stable condition (data is not
transitioning). The fault indicates trouble in receiving data from the
satellite. The modem passes this signal transparently, and can close a
FORM C contact. The indication is a monitor function only to help
isolate the source of trouble in a system.
The receive decoded error rate has exceeded 10-3 over a 60-second
period measured on the framing bits.
This is defined as a major (prompt) receive alarm by INTELSAT
specifications IESS-308. In a redundant system, a switch-over will be
attempted. Since some data must be correctly received to indicate this
fault, receive AIS will not be substituted. This fault is to be sent as a
backward alarm to the distant end. This must be wired externally, as
faults other than from the modem may need to enter the fault tree.
Not Applicable
5–15
SNM-1000 Node Control Modem
Maintenance
Fault/Alarm
BUFFER CLK PLL
BUFFER CLK ACT
DEMUX_LOCK
Revision 3
MN/SNM1000.IOM
Possible Problem and Action
Buffer clock phase-locked loop fault. The buffer synthesizer is the
wrong frequency or will not lock.
Ensure the selected buffer clock source is at the proper frequency and
level. If the fault continues, contact the Comtech EF Data Customer
Support Department.
Activity detector alarm of the selected interface receive clock.
The interface will fall back to the satellite clock when this fault is
active.
Demultiplexer synchronization lock fault. This fault means that the
demultiplexer is unable to maintain valid frame and multiframe
alignment.
RX 2047 LOCK
The usual cause is invalid or absent receive data. This is a major
(prompt) alarm. The alarm will cause insertion of receive AIS (all 1s)
and the switch-over will be attempted. This fault is to be sent as a
backward alarm to the distant end. This fault will occur when no
carrier is present, but will probably never occur with a correct signal.
RX 2047 lock alarm.
BUFFER FULL
Indicates the RX 2047 data test pattern is not being received by the
decoder. The alarm probably indicates the transmitter is not set
correctly.
Buffer full alarm.
RX INSERT
RX AUDIO 1 CLIP
RX AUDIO 2 CLIP
CONFIGURATION
Indicates the buffer is < 10% or > 90% full.
Not Applicable
Not Applicable
Not Applicable
Configuration fault.
Indicates the selected, Fault Relay or Fault LED is not functioning.
Check the signal of the selected RX source to verify the signal is
present. The configuration will fall back to the default when this alarm
is active.
5–16
SNM-1000 Node Control Modem
Maintenance
5.1.3.5
Revision 3
MN/SNM1000.IOM
Common Equipment Faults
Fault/Alarm
BATTERY/CLOCK
Possible Problem and Action
M&C battery voltage or clock fault.
-12 VOLT SUPPLY
Indicates a low voltage in the memory battery. Typically, this fault will
be active when a modem has been hard reset or the firmware has been
changed. When a hard reset has been executed or the firmware has been
changed, this fault will typically be active when the modem is first
turned on.
-12V power supply fault.
Indicates a high or low voltage condition. Level is ± 5%.
+5 VOLT SUPPLY
Check for a short on the –12V line from the power supply or on any of
the plug-in boards.
+12 VDC power supply fault. Use the same procedure as with –12V
fault.
+5V power supply fault. Use the same procedure as with a –12V fault.
SELF TEST
CONTROLLER
The +5V supply requires a minimum load of 1A.
Not Applicable
Controller fault.
INTERFACE MODULE
Indicates a loss of power in the M&C card. Typically indicates the
controller has gone through a power on/off cycle.
Interface module fault.
+12 VOLT SUPPLY
Indicates a problem in programming the interface card.
5–17
SNM-1000 Node Control Modem
Maintenance
Revision 3
MN/SNM1000.IOM
This page is intentionally left blank.
5–18
Appendix A. REMOTE CONTROL
OPERATION
The commands listed in this appendix are M&C remote commands used with other
modems in the network.
WARNING
•
•
Status queries are always safe. However, exercise caution when issuing an
SDM-300A M&C command. Some commands can produce an undesirable
result if executed on an active/installed SNM-1000 MIDAS node. For
example; the IF Loopback command “MC IFL_ON” will cause the
SNM-1000 to disengage from the MIDAS control channel. Reconnecting the
control channel would only be possible by taking the modem out of IF
Loopback via the front panel or a local M&C command.
Firmware number:
Software version:
FW/6535-3G
4.1.5
Note: The firmware referenced in this manual may be an earlier version of the actual
firmware supplied with the unit.
A.1
Channel Number
Channel number <channel_no> has a valid range of 0 through 30. Leading zeros are
ignored. Channel 0 is valid for an SNM-1000 Node Control modem and channels 1
through 30 are valid for external traffic modems attached to the SNM-1000 such as
SDM-300s, SDM-6000s, etc.
A–1
SNM-1000 Node Control Modem
Remote Control Operation
A.2
Revision 3
MN/SNM1000.IOM
Abnormal Condition Responses
If a satellite modem receives a message which does not match the established protocol or
cannot be implemented, a negative acknowledgment message is sent in response. The
possible message formats are:
•
<channel_no> ?ER1_PARITY ERROR'cr''lf']
(Error message for received parity errors.)
•
<channel_no> ?ER2_INVALID PARAMETER'cr''lf']
(Error message for a recognized command which cannot be implemented or has parameters
which are out-of-range.)
•
<channel_no> ?ER3_UNRECOGNIZABLE COMMAND'cr''lf']
(Error message for unrecognizable command or bad command syntax.)
•
<channel_no> ?ER4_MODEM IN LOCAL MODE'cr''lf']
(Modem in local error, use the REM command to go to remote mode.)
•
<channel_no> ?ER5_HARD CODED PARAMETER'cr''lf']
(Error message indicating that the parameter is hardware dependent and may not be changed
remotely.)
A.2.1
Character Set
The interface responds to ASCII characters in the range of 0x00 to 0x7F. The 8th bit
(most significant) is not generated on the transmit side and is ignored on the receive side.
A.2.2
Status Lines and Flow Control
The interface ignores all status inputs.
A.2.3
Message Structure
A message is either a command or a response. Each message is made up of three
elements:
•
•
Prefix
Message body
End character
A–2
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
A.3
Configuration Commands/Responses
A.3.1
Modulator Configuration Commands
Modulator Frequency
Command:
Response:
Status:
Response:
RF Output (IF Output)
Modulator Rate Preset
Assignment
<channel_no> MC MF_nnn.nnnn'cr'
<channel_no> MF_nnn.nnnn'cr'
RF_OFF'cr''lf']
<channel_no> MC MF_'cr'
<channel_no> MF_nnn.nnnn'cr''lf']
Command:
Response:
<channel_no> MC RF_xxx'cr'
<channel_no> RF_xxx'cr''lf']
Status:
Response:
<channel_no> MC RF_'cr'
<channel_no> RF_xxx'cr''lf']
Command:
<channel_no> MC
AMRx_nnnn_mmm.mmm'cr'
<channel_no>
AMRx_nnnn_mmm.mmm'cr''lf']
Response:
Status:
Response:
<channel_no> MC AMRx_'cr'
<channel_no>
AMRx_nnnn_mmm.mmm'cr''lf']
Where: nnn.nnnn = Frequency in MHz, 50.0000 to
180.0000, in 1 Hz steps.
Note: When the modulator frequency is programmed,
the RF output is switched OFF.
Where: xxx = ON or OFF.
Where:
x = A, B, C, D or V (Preset designator).
In TX Burst mode,
nnnn = 1/2, or 3/4 (Coder rate).
In TX continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4 (QPSK
3/4), 7/8 (QPSK 7/8), BP12 (BPSK 1/2), 8P23
(8PSK 2/3), OQ12 (OQPSK 1/2), OQ34 (OQPSK
3/4), OQ78 (OQPSK 7/8), OQSK (OQPSK 1/1),
BPSK (BPSK 1/1) (QPSK (QPSK 1/1),
2144 (BPSK 21/44), B516 (BPSK 5/16), 8P34
(8PSK 3/4).
mmm.mmm = Data rate in kHz.
Modulator Rate Preset
Selection
Modulator Rate
Variable Assignment
and Selection
Command:
Response:
<channel_no> MC SMRx_'cr'
<channel_no> SMRx_'cr'
RF_OFF'cr''lf']
Status:
(See MR command.)
Command:
Response:
Status:
<channel_no> MC
SMRV_nnnn_mmm.mmm'cr'
<channel_no>
SMRV_nnnn_mmm.mmm'cr'
<channel_no> RF_OFF'cr''lf']
Where: x = A, B, C, D, or V (Preset designator).
Note: Setting the modulator rate turns the RF
transmitter OFF.
Where:
In TX Burst mode,
nnnn = 1/2 or 3/4 (Coder rate).
In TX Continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4 (QPSK
3/4), 7/8 (QPSK 7/8), BP12 (BPSK 1/2), 8P23
(8PSK 2/3), OQ12 (OQPSK 1/2), OQ34 (OQPSK
3/4), OQ78 (OQPSK 7/8), OQSK (OQPSK 1/1),
BPSK (BPSK 1/1) (QPSK (QPSK 1/1),
2144 (BPSK 21/44), B516 (BPSK 5/16), 8P34
(8PSK 3/4).
(See MR command.)
mmm.mmm = Data rate in kHz.
Note: Setting the modulator turns the RF transmitter
OFF.
A–3
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
Set Modulator Power
Offset
Command:
Response:
<channel_no> MC MPO_snn.n'cr'
<channel_no> MPO_snn.n'cr''lf']
Set Modulator Output
Power Level
Status:
Response:
Command:
Response:
<channel_no> MC MPO_'cr'
<channel_no> MPO_snn.n'cr''lf']
<channel_no> MC MOP_snnn.n'cr'
<channel_no> MOP_snnn.n'cr''lf']
Status:
Response:
<channel_no> MC MOP_'cr'
<channel_no> MOP_snnn.n'cr''lf']
Note: The nominal power range is modified relative to
the value specified by the modulator power offset
(MPO_).
Command:
Response:
<channel_no> MC SE_xxx'cr'
<channel_no> SE_xxx'cr''lf']
Where: xxx = ON or OFF.
Status:
Response:
<channel_no> MC SE_'cr'
<channel_no> SE_xxx'cr''lf']
Command:
Response:
<channel_no> MC DENC_xxx'cr'
<channel_no> DENC_xxx'cr''lf']
Status:
Response:
<channel_no> MC DENC_'cr'
<channel_no> DENC_xxx'cr''lf']
Command:
Response:
<channel_no> MC MT_xxxx'cr'
<channel_no> MT_xxxx'cr''lf']
Status:
Response:
<channel_no> MC MT_'cr'
<channel_no> MT_xxxx'cr''lf']
Scrambler Enable
Differential Encoder
Enable
Modulator Type
Where: snn.n = +99.0 to -99.0, in 0.1 dB increments.
Note: The modulator power offset is added to the
nominal power level to adjust the transmit power range.
Where: snnn.n = -30.0 to +5.0, in 0.1 steps (nominal
range in dBm).
Where:
In TX Burst mode, xxx = OFF.
In TX Continuous mode, xxx = ON or OFF.
Where:
In TX Burst mode,
xxxx = INTL (INTELSAT Open Network).
In TX Continuous mode,
xxxx = INTL (INTELSAT Open Network), EFD
(Comtech EF Data Closed Network), CSC
(Comstream Closed Network), FDC (Fairchild
Closed Network), or SDM51 (SDM51 Compatible).
Modulator Encoder
Type
Command:
Response:
<channel_no> MC MET_xxx'cr'
<channel_no> MET_xxx'cr''lf']
Status:
Response:
<channel_no> MC MET_'cr'
<channel_no> MET_xxx'cr''lf']
Where:
In TX Burst mode,
xxx = VIT (K-7 Viterbi Encoder).
In TX Continuous mode,
xxx = VIT (K-7 Viterbi Encoder)
SEQ (Sequential Encoder)
TUR (Turbo)
Modem Reference
Clock
Modulator Spectrum
Rotation
Reed-Solomon
Encoder Enable
Command:
Response:
<channel_no> MC MRC_xxxxx'cr'
<channel_no> MRC_xxxxx'cr''lf']
Status:
Response:
<channel_no> MC MRC_'cr'
<channel_no> MRC_xxxxx'cr''lf']
Command:
Response:
<channel_no> MC MSR_xxx'cr'
<channel_no> MSR_xxx'cr''lf']
Status:
Response:
<channel_no> MC MSR_'cr'
<channel_no> MSR_xxx'cr''lf']
Command:
Response:
<channel_no> MC RSEN_xxx'cr'
<channel_no> RSEN_xxx'cr'lf']
Status:
Response:
<channel_no> MC RSEN_'cr'
<channel_no> RSEN_xxx'cr'lf']
A–4
Where: xxxxx = INT (INTERNAL), EXT1 (EXTERNAL 1
MHz), EXT5 (EXTERNAL 5 MHz), EXT10 (EXTERNAL
10 MHz), EXT20 (EXTERNAL 20 MHz), OUT10
(OUTPUT 10 MHz).
Where: xxx = NRM (normal spectrum), INV (inverted
spectrum).
Where: xxx = ON or OFF.
SNM-1000 Node Control Modem
Remote Control Operation
Transmit BPSK Data
Ordering for
Continuous Mode
Carrier Only Mode
Modulator Preamble
for Burst Mode
Reed-Solomon
Interleave Value
TX 8PSK 2/3
IESS-310 Operation
Bulk Modulator
Configuration
Revision 3
MN/SNM1000.IOM
Command:
Response:
<channel_no> MC TDA_xxx'cr'
<channel_no> TDA_xxx'cr''lf']
Status:
Response:
<channel_no> MC TDA_'cr'
<channel_no> TDA_xxx'cr''lf']
Command:
Response:
<channel_no> MC COM_xxxxxx'cr'
<channel_no> COM_xxxxxx'cr''lf']
Status:
Response:
<channel_no> MC COM_xxxxxx'cr'
<channel_no> COM_xxxxxx'cr''lf']
Command:
Response:
<channel_no> MC MPRE_n'cr'
<channel_no> MPRE_n'cr''lf']
Status:
Response:
<channel_no> MC MPRE_'cr'
<channel_no> MPRE_n'cr''lf']
Command:
Response:
<channel_no> MC TRSI_xx'cr'
<channel_no> TRSI_xx'cr''lf']
Status:
Response:
<channel_no> MC TRSI_'cr'
<channel_no> TRSI_xx'cr''lf']
Command:
Response:
<channel_no> MC T310_xxx'cr'
<channel_no> T310_xxx'cr''lf']
Status:
Response:
<channel_no> MC T310_'cr'
<channel_no> T310_xxx'cr''lf']
Command:
<channel_no>
BMC_BMNOP,xxx.x,yyy.yyyy,DDDD,zzz
z.zzz'cr'
<channel_no>
BMC_BMNOP,xxx.x,yyy.yyyy,DDDD,zzz
z.zzz'cr''lf']
Response:
Where: xxx = NRM (Standard) or INV (Non-Standard).
Where: xxxxxx = OFF (NORMAL-MODULATED), DUAL
(DUAL-CW), OFFSET (OFFSET-CW), CENTER
(CENTER-CW).
Where: n = 1 (Preamble 1) or 2 (Preamble 2).
Where: xx = 4, 8, or 16.
Where: xxx = ON or OFF.
Where:
B = Modulator set to Burst (B) or Continuous (C).
M = Scrambler status set to OFF (1) or ON (0).
N = Differential Encoder status set to 0 or 1.
O = Reed-Solomon Encoder status set to 0 or 1
(always 0).
P = IF Output 0 (off) or 1 (on).
xxx.x = Output power setting: -5.0 to -30.0 dBm, in
0.1 steps.
yyy.yyyy = Output IF frequency: 50.0 to 180.0 MHz.
DDDD = Code Rate: '1/2', '3/4' ,'7/8', or 'BP12'.
zzzz.zzz = Data Rate: 4.800 to 2000.0 kbps (limited
by Code Rate).
A–5
SNM-1000 Node Control Modem
Remote Control Operation
A.4
Revision 3
MN/SNM1000.IOM
Demodulator Configuration Commands
Set Demodulator
Frequency
Demodulator Rate
Preset Assignment
Command:
Response:
<channel_no> MC DF_nnn.nnnn'cr'
<channel_no> DF_nnn.nnnn'cr''lf']
Status:
Response:
<channel_no> MC DF_'cr'
<channel_no> DF_nn.nnnn'cr''lf']
Command:
<channel_no> MC
ADRx_nnnn_mmm.mmm'cr'
<channel_no>
ADRx_nnnn_mmm.mmm'cr''lf']
Response:
Status:
Response:
<channel_no> MC ADRx_'cr'
<channel_no>
ADRx_nnnn_mmm.mmm'cr''lf']
Where: nnn.nnnn = Frequency in MHz,
50.0000 to 180.0000, in 1 Hz steps.
Where:
x = A, B, C, D, or V (Preset designator).
In RX Continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4
(QPSK 3/4), 7/8 (QPSK 7/8), BP12 (BPSK
1/2), 8P23 (8PSK 2/3), OQ12 (OQPSK
1/2), OQ34 (OQPSK 3/4), OQ78 (OQPSK
7/8), OQSK (OQPSK 1/1), BPSK (BPSK
1/1) (QPSK (QPSK 1/1),
2144 (BPSK 21/44), B516 (BPSK 5/16),
8P34 (8PSK 3/4).
mmm.mmm = Data rate in kHz.
Demodulator Rate
Preset Selection
Demodulator Rate
Variable Assignment
and Selection
Command:
Response:
<channel_no> MC SDRx_'cr'
<channel_no> SDRx_'cr''lf']
Status:
(See DR command.)
Command:
<channel_no> MC
SDRV_nnnn_mmm.mmm'cr'
<channel_no>
SDRV_nnnn_mmm.mmm'cr''lf']
Response:
Status:
(See DR command.)
Where: x = A, B, C, D, or V (Preset
designator).
Where:
In RX Continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4
(QPSK 3/4), 7/8 (QPSK 7/8), BP12 (BPSK
1/2), 8P23 (8PSK 2/3), OQ12 (OQPSK
1/2), OQ34 (OQPSK 3/4), OQ78 (OQPSK
7/8), OQSK (OQPSK 1/1), BPSK (BPSK
1/1) (QPSK (QPSK 1/1),
2144 (BPSK 21/44), B516 (BPSK 5/16),
8P34 (8PSK 3/4).
mmm.mmm = Data rate in kHz.
Descrambler Enable
Differential Decoder
Enable
RF Loopback
Command:
Response:
<channel_no> MC DE_xxx'cr'
<channel_no> DE_xxx'cr''lf']
Status:
Response:
<channel_no> MC DE_'cr'
<channel_no> DE_xxx'cr''lf']
Command:
Response:
<channel_no> MC DDEC_xxx'cr'
<channel_no> DDEC_xxx'cr''lf']
Status:
Response:
<channel_no> MC DDEC_'cr'
<channel_no> DDEC_xxx'cr''lf']
Command:
Response:
<channel_no> MC RFL_xxx'cr'
<channel_no> RFL_xxx'cr''lf']
Status:
Response:
<channel_no> MC RFL_'cr'
<channel_no> RFL_xxx'cr''lf']
A–6
Where: xxx = ON or OFF.
Where:
In RX Continuous mode, xxx = ON or OFF.
Where: xxx = ON or OFF.
SNM-1000 Node Control Modem
Remote Control Operation
IF Loopback
Sweep Center
Frequency
Sweep Width Range
Revision 3
MN/SNM1000.IOM
Command:
Response:
<channel_no> MC IFL_xxx'cr'
<channel_no> IFL_xxx'cr''lf']
Status:
Response:
<channel_no> MC IFL_'cr'
<channel_no> IFL_xxx'cr''lf']
Command:
Response:
<channel_no> MC SCF_snnnnn'cr'
<channel_no> SCF_snnnnn'cr''lf']
Where: snnnnn = -35000 to +35000, in 1 Hz
steps.
Status:
Response:
<channel_no> MC SCF_'cr'
<channel_no> SCF_snnnnn'cr''lf']
Note: In RX Continuous mode only.
Command:
Response:
<channel_no> MC SWR_nnnnn'cr'
<channel_no> SWR_nnnnn'cr''lf']
Where: nnnnn = 0 to 70000, in 1 Hz steps.
Status:
Response:
<channel_no> MC SWR_'cr'
<channel_no> SWR_nnnnn'cr''lf']
Command:
Response:
<channel_no> MC SR_xxx'cr'
<channel_no> SR_xxx'cr''lf']
Status:
Response:
<channel_no> MC SR_'cr'
<channel_no> SR_xxx'cr''lf']
Command:
Response:
<channel_no> MC DSR_xxx'cr'
<channel_no> DSR_xxx'cr''lf']
Status:
Response:
<channel_no> MC DSR_'cr'
<channel_no> DSR_xxx'cr''lf']
Command:
Response:
<channel_no> MC RSDE_xxx'cr'
<channel_no> RSDE_xxx'cr'lf']
Status:
Response:
<channel_no> MC RSDE_'cr'
<channel_no> RSDE_xxx'cr'lf']
Command:
Response:
<channel_no> MC BERT_xxxx'cr'
<channel_no> BERT_xxxx'cr''lf']
Status:
Response:
<channel_no> MC BERT_'cr'
<channel_no> BERT_xxxx'cr''lf']
Command:
Response:
<channel_no> MC DT_xxxx'cr'
<channel_no> DT_xxxx'cr''lf']
Status:
Response:
<channel_no> MC DT_'cr'
<channel_no> DT_xxxx'cr''lf']
Command:
Response:
<channel_no> MC DDT_xxx'cr'
<channel_no> DDT_xxx'cr''lf']
Status:
Response:
<channel_no> MC DDT_'cr'
<channel_no> DDT_xxx'cr''lf']
Command:
Response:
<channel_no> MC RRSI_xx'cr'
<channel_no> RRSI_xx'cr''lf']
Status:
Response:
<channel_no> MC RRSI_'cr'
<channel_no> RRSI_xx'cr''lf']
Command:
Response:
<channel_no> MC R310_xxx'cr'
<channel_no> R310_xxx'cr''lf']
Status:
Response:
<channel_no> MC R310_'cr'
<channel_no> R310_xxx'cr''lf']
Where: xxx = ON or OFF.
Note: In RX Continuous mode only.
Sweep Reacquisition
Demodulator
Spectrum Rotation
Reed-Solomon
Decoder Enable
Bit Error Rate
Threshold
Demodulator Type
Demodulator Decoder
Type
Reed-Solomon
Interleave Value
RX 8PSK 2/3
IESS-310 Operation
A–7
Where: xxx = 0 to 999 (number of seconds).
Where: xxx = NRM (normal spectrum), INV
(inverted spectrum).
Where: xxx = ON, OFF, or CORR_OFF.
Where: xxxx = None or 1E-n (where n = 3, 4, 5,
6, 7, or 8 [exponent of threshold]).
Where:
In RX Continuous mode,
xxxx = INTL (INTELSAT Open Network),
EFD (Comtech EF Data Closed Network),
CSC (Comstream Closed Network), or FDC
(Fairchild Closed Network).
Where:
In RX Continuous mode,
xxx = VIT (K-7 Viterbi Encoder)
SEQ (Sequential Encoder)
TUR (Turbo)
Where: xx = 4, 8, or 16.
Where: xxx = ON or OFF.
SNM-1000 Node Control Modem
Remote Control Operation
Receive BPSK Data
Ordering
Bulk Demodulator
Configuration
Revision 3
MN/SNM1000.IOM
Command:
Response:
<channel_no> MC RDA_xxx'cr'
<channel_no> RDA_xxx'cr''lf']
Where: xxx = NRM (Standard) or INV (NonStandard).
Status:
Response:
<channel_no> MC RDA_'cr'
<channel_no> RDA_xxx'cr''lf']
Note: In RX Continuous mode only.
Command:
<channel_no>
BDC_BMNO,yyy.yyyy,ttttt,uuuuu,DDDD,
zzzz.zzz'cr'
<channel_no>
BDC_BMNO,yyy.yyyy,ttttt,uuuuu,DDDD,
zzzz.zzz
'cr''lf']
Where:
Response:
B = Modulator set to Burst (B) or
Continuous (C).
M = Descrambler status OFF (0) or ON (1).
N = Differential Decoder status 0 or 1.
O = Reed Solomon Decoder status 0 or 1
(always 0).
yyy.yyyy = Input IF frequency 50.0 to
180.0 MHz.
ttttt = Sweep Center Frequency -35000 to
+35000.
uuuuu = Sweep Frequency Range 0 to
70000.
DDDD = Code Rate '1/2','3/4','7/8' ‘8/9’,
‘5/16’ (B516), ‘21/44’ (2144), or 'BP12'.
zzzz.zzz = Data Rate 4.800 to 2000.0 kbps
(limited by Code Rate).
Maximum Packet Size
Command:
Response:
<channel_no> BPS,xxxxxxxx'cr'
<channel_no> BPS,xxxxxxxx'cr''lf']
Where: xxxxxxxx = user length in bits, range of
2 to 16777216 bits (QPSK 1/2, Burst mode).
This command specifies the maximum user
data packet length that the SNM-1000 will
accept in Burst mode. If the received packet is
longer that the specified length, the modem
assumes that the packet has been corrupted
and enters the acquisition mode.
A–8
SNM-1000 Node Control Modem
Remote Control Operation
A.5
Revision 3
MN/SNM1000.IOM
Interface Configuration Commands
Transmit Clock
Transmit Clock Phase
Command:
Response:
<channel_no> MC TC_xxx'cr'
<channel_no> TC_xxx'cr''lf']
Status:
Response:
<channel_no> MC TC_'cr'
<channel_no> TC_xxx'cr''lf']
Command:
Response:
<channel_no> MC TCP_xxxx'cr'
<channel_no> TCP_xxxx'cr''lf']
Status:
Response:
<channel_no> MC TCP_'cr'
<channel_no> TCP_xxxx'cr''lf']
Where:
xxx = INT (Internal SCT Clock), EXT (External
TX Terrestrial Clock), or SAT (Receive Satellite
Clock).
Where:
In TX Burst mode, xxxx = NRM (Normal Clock
Phasing) or INV (Inverted Clock Phasing).
In TX Continuous mode, xxxx = NRM (Normal
Clock Phasing), INV (Inverted Clock Phasing),
or AUTO (Automatic Clock Phasing).
Buffer Clock
Receive Clock Phase
Baseband Loopback
Command:
Response:
<channel_no> MC BC_xxx'cr'
<channel_no> BC_xxx'cr''lf']
Status:
Response:
<channel_no> MC BC_'cr'
<channel_no> BC_xxx'cr''lf']
Note: In RX Continuous mode only.
Command:
Response:
<channel_no> MC RCP_xxxx'cr'
<channel_no> RCP_xxxx'cr''lf']
Where: xxxx = NRM (normal clock phasing) or INV
(inverted clock phasing).
Status:
Response:
<channel_no> MC RCP_'cr'
<channel_no> RCP_xxxx'cr''lf']
Command:
Response:
<channel_no> MC BBL_xxx'cr'
<channel_no> BBL_xxx'cr''lf']
Status:
Response:
<channel_no> MC BBL_'cr'
<channel_no> BBL_xxx'cr''lf']
A–9
Where: xxx = INT (Internal SCT Clock), EXT
(External TX Terrestrial Clock), SAT (Receive
Satellite Clock), or REF (External Reference Clock).
Where: xxx = ON or OFF.
SNM-1000 Node Control Modem
Remote Control Operation
A.5.1
Revision 3
MN/SNM1000.IOM
Interface Buffer Size
Buffer size programming is supported in two formats: bits or ms. The selected format
shall be chosen using the buffer programming command (IBP_), shown in the following
listing.
Interface Buffer Size
(bit format)
Command:
Response:
<channel_no> MC IBS_nnnnn'cr'
<channel_no> IBS_nnnnn'cr''lf']
Where: nnnnn = 64 to 65536, in 16-bit
increments.
Status:
Response:
<channel_no> MC IBS_'cr'
<channel_no> IBS_nnnnn'cr''lf']
Note: In RX Continuous mode only.
Command:
Response:
<channel_no> MC IBS_nn'cr'
<channel_no> IBS_nn'cr''lf']
Where: nn = 0 to 50 (buffer size in ms).
Status:
Response:
<channel_no> MC IBS_'cr'
<channel_no> IBS_nn'cr''lf']
Interface Buffer Center
Command:
Response:
<channel_no> MC IBC_'cr'
<channel_no> IBC_'cr''lf']
Note: In RX Continuous mode only.
Interface Buffer Programming
Command:
Response:
<channel_no> MC IBP_xxx'cr'
<channel_no> IBP_xxx'cr''lf']
Where: xxx = bits or ms.
Status:
Response:
<channel_no> MC IBP_'cr'
<channel_no> IBP_xxx'cr''lf']
Interface Buffer Size
(ms format)
Note: In RX Continuous mode only.
Note: In RX Continuous mode only.
A–10
SNM-1000 Node Control Modem
Remote Control Operation
A.6
Revision 3
MN/SNM1000.IOM
System Configuration Commands
Refer to the following listing for system commands.
Time of Day
Command:
Response:
Date
<channel_no> MC
TIME_hh:mmxx'cr'
<channel_no>
TIME_hh:mmxx'cr''lf']
Status:
Response:
<channel_no> MC TIME_'cr'
<channel_no>
TIME_hh:mmxx'cr''lf']
Command:
<channel_no> MC
DATE_mm/dd/yy'cr'
<channel_no>
DATE_mm/dd/yy'cr''lf']
Response:
Where:
hh = 1 to 12 (hours).
mm = 00 to 59 (minutes).
xx = AM or PM.
Where:
mm = 1 to 12 (month).
dd = 1 to 31 (day).
yy = 00 to 99 (year).
Status:
Response:
<channel_no> MC DATE_'cr'
<channel_no>
DATE_mm/dd/yy'cr''lf']
Remote Operation
Command:
Response:
<channel_no> MC REM_'cr'
<channel_no> REM_'cr''lf']
The modem will respond to any status request at
any time. However, the modem must be in Remote
mode to change configuration parameters.
Clear Stored Faults
Command:
Response:
<channel_no> MC CLSF_'cr'
<channel_no> CLSF_'cr''lf']
This command is used to clear all stored faults
logged by the modem.
Modem Operation Mode
Command:
<channel_no> MC
MOM_xxxxxxx'cr'
<channel_no>
MOM_xxxxxxx'cr''lf']
Where: xxxxxxx = TX_only, RX_only, or duplex.
Response:
Status:
Response:
RTS TX-IF Control
Mode
Command:
Response:
<channel_no> MC MOM_'cr'
<channel_no>
MOM_xxxxxxx'cr''lf']
<channel_no> MC RTSM_xxx'cr'
<channel_no> RTSM_xxx'cr''lf']
Status:
Response:
<channel_no> MC RTSM_'cr'
<channel_no> RTSM_xxx'cr''lf']
This command configures the modem for simplex or
duplex operation modes. When transmit only mode
is selected, receive faults are inhibited. When
receive only mode is selected, transmit faults are
inhibited.
Where: xxx = ON or OFF.
Note: In TX Continuous mode only.
This command configures the modem for the RTS
TX-IF control mode. If ON is selected, the TX-IF
output will only be turned ON if the incoming RTS
signal is asserted.
The TX-IF output has to be programmed ON.
There should be no major modulator faults
present. If OFF is selected, the TX-IF output will
operate normally, ignoring the RTS signal.
Online LED Display
Command:
Response:
<channel_no> LED,AAAAA'cr'
<channel_no> LED,AAAAA'cr''lf']
A–11
Where: AAAAA = OFF, ON, or FLASH
SNM-1000 Node Control Modem
Remote Control Operation
A.6.1
Revision 3
MN/SNM1000.IOM
Modem Type Commands
Refer to the following listing for modem type commands.
Transmit Mode
Selection
Command:
Response:
Receive Mode Selection
Status:
Response:
<channel_no> MC TXM_'cr'
<channel_no> MC
TXM_xxxxx'cr''lf']
Command:
Response:
<channel_no> MC RXM_xxxxx'cr'
<channel_no> MC
RXM_xxxxx'cr''lf']
Status:
Response:
A.7
<channel_no> MC TXM_xxxxx'cr'
<channel_no> MC
TXM_xxxxx'cr''lf']
<channel_no> MC RXM_'cr'
<channel_no> MC
RXM_xxxxx'cr''lf']
Where: xxxxx = BURST or CONT (Continuous).
This command configures the modem transmit
side to operate in Burst or Continuous mode.
The <channel_no> is 0 for the remote control
mode SNM-1000.
Where: xxxxx = CONT (Continuous).
This command configures the modem receive side
to operate in Burst or Continuous mode.
The <channel_no> is 0 for the remote control
mode SNM-1000.
Configuration Status
Refer to the following listing for configuration status data.
Modulator
Configuration
Status
Status:
Response:
<channel_no> MC MCS_'cr'
<channel_no> MCS_'cr'
RF_xxx'cr'
MF_nnn.nnnn'cr'
MR_nnnn_mmm.mmm'cr'
AMRA_nnnn_mmm.mmm'cr'
AMRB_nnnn_mmm.mmm'cr'
AMRC_nnnn_mmm.mmm'cr'
AMRD_nnnn_mmm.mmm'cr'
AMRV_nnnn.mmm.mmm'cr'
MPO_snn.n'cr'Modulator
MOP_snnn.n'cr'
SE_xxx'cr'
DENC_xxx'cr'
MT_xxxx'cr'
MET_xxx'cr'
TDA_xxx'cr'
COM_xxx'cr'
TXM_xxxxx'cr'
MPRE_n'cr'
RSEN_xxx'cr''lf']
(Note 1)
(Note 2)
(Note 1)
RF Output (ON/OFF)
Modulator Frequency
Modulator Rate
Preset A Assignment
Preset B Assignment
Preset C Assignment
Preset D Assignment
Preset V Assignment
Power Offset
Modulator Output Power
Scrambler Enable (ON/OFF)
Differential Encoder (ON/OFF)
Modulator Type
Modulator Encoder Type
Transmit BPSK Data Ordering
Carrier Only Mode (ON/OFF)
Transmit Mode
Modulator Preamble
Reed-Solomon Encoder
The modulator configuration status
command causes a block of data to be
returned by the addressed modem. The
block of data reflects the current
configuration status of the modulator
module.
Notes:
1. Status only returned in Transmit
Burst mode.
2. Status only returned in Transmit
Continuous mode.
A–12
SNM-1000 Node Control Modem
Remote Control Operation
Modulator/
Coder Configuration
Program Status
Status:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC MCP_'cr'
<channel_no> MCP_'cr'
MOM_xxxxxxx'cr'
MT_xxxx'cr'
MET_xxx'cr'
MF_nnn.nnnn'cr'
MR_nnnn_mmm.mmm'cr'
MPO_snn.n'cr'
MOP_snnn.n'cr'
SE_xxx'cr'
DENC_xxx'cr'
TDA_xxx'cr'
TC_xxx'cr'
TCP_xxxx'cr'
BBL_xxx'cr'
RTSM_xxx'cr'
TXM_xxxxx'cr'
MPRE_n'cr'
RSEN_xxx'cr'
RF_xxx'cr''lf']
(Note 1)
(Note 2)
(Note 2)
(Note 2)
(Note 1)
Modem Operation Mode
Modulator Type
Modulator Encoder Type
Modulator Frequency
Modulator Rate
Modulator Power Offset
Modulator Output Power
Scrambler Enable (ON/OFF)
Differential Encoder (ON/OFF)
Transmit BPSK Data Ordering
Transmit Clock (Source)
Transmit Clock Phase
Baseband Loopback
RTS TX-IF Control Mode
Transmit Mode
Modulator Preamble
Reed-Solomon Encoder
RF Output (ON/OFF)
This command is used by the Comtech EF
Data M:N protection switch to collect
information necessary for configuring
backup modems.
Notes:
1. Status only returned in Transmit
Continuous mode.
2. Status only returned in Transmit
Burst mode.
Demodulator
Configuration Status
Status:
Response:
<channel_no> MC DCS_'cr'
<channel_no> DCS_'cr'
DF_nnn.nnnn'cr'
DR_nnnn_mmm.mmm'cr'
ADRA_nnnn_mmm.mmm'cr'
ADRB_nnnn_mmm.mmm'cr'
ADRC_nnnn_mmm.mmm'cr'
ADRD_nnnn_mmm.mmm'cr'
ADRV_nnnn.mmm.mmm'cr'
DE_xxx'cr'
DDEC_xxx'cr'
RFL_xxx'cr'
IFL_xxx'cr'
SCF_snnnnn'cr'
SWR_nnnnn'cr'
BERT_xxxx'cr'
DT_xxxx'cr'
DDT_xxx'cr'
RDA_xxx'cr'
RXM_xxxxx'cr'
RSDE_xxx'cr''lf']
(Note 1)
(Note 1)
(Note 1)
(Note 1)
Demodulator Frequency
Demodulator Rate
Preset A Assignment
Preset B Assignment
Preset C Assignment
Preset D Assignment
Preset V Assignment
Descrambler Enable (ON/OFF)
Differential Decoder (ON/OFF)
RF Loopback (ON/OFF)
IF Loopback (ON/OFF)
Sweep Center Frequency
Sweep Width Range
BER Threshold
Demodulator Type
Demodulator Decoder Type
Receive BPSK Data Ordering
Receive Mode
Reed-Solomon Decoder
The demodulator configuration status
command causes a block of data to be
returned by the addressed modem. The
block of data reflects the current
configuration of the demodulator.
Notes:
1. Status only returned in Receive
Continuous mode.
A–13
SNM-1000 Node Control Modem
Remote Control Operation
Demodulator/Decoder
Configuration
Program Status
Status:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC DCP_'cr'
<channel_no> DCP_'cr'
MOM_xxxxxxx'cr'
BERT_xxxx'cr'
DT_xxxx'cr'
DDT_xxx'cr'
DF_nnn.nnnn'cr'
DR_nnnn_mmm.mmm'cr'
DE_xxx'cr'
DDEC_xxx'cr'
RFL_xxx'cr'
IFL_xxx'cr'
SCF_snnnnn'cr'
SWR_nnnnn'cr'
RDA_xxx'cr'
BC_xxx'cr'
RCP_xxxx'cr'
BBL_xxx'cr'
IBP_xxx'cr'
IBS_nnnnn'cr'
RXM_xxxxx'cr'
RSDE_xxx'cr''lf']
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
Modem Operation Mode
BER Threshold
Demodulator Type
Demodulator Decoder Type
Demodulator Frequency
Demodulator Rate
Descrambler Enable (ON/OFF)
Differential Decoder (ON/OFF)
RF Loopback (ON/OFF)
IF Loopback (ON/OFF)
Sweep Center Frequency
Sweep Width Range
Receive BPSK Data Ordering
Buffer Clock (Source)
Receive Clock Phase
Baseband Loopback
Interface Buffer Programming
Interface Buffer Size
Receive Mode
Reed-Solomon Decoder
This command is used by the M:N
protection switch to collect information
necessary for configuring backup modems.
Notes:
1. Status only returned in Receive
Continuous mode.
Interface
Configuration Status
Status:
Response:
<channel_no> MC ICS_'cr'
<channel_no> ICS_'cr'
TC_xxx'cr'
TCP_xxxx'cr'
RCP_xxxx'cr'
BBL_xxx'cr'
BC_xxx'cr'
IBP_xxx'cr'
IBS_nnnnn'cr'
RTSM_xxx'cr''lf']
(Note 1)
(Note 1)
(Note 1)
(Note 2)
Transmit Clock (Source)
Transmit Clock Phase
Receive Clock Phase
Baseband Loopback
Buffer Clock (Source)
Interface Buffer Programming
Interface Buffer Size
RTS TX-IF Control Mode
The interface configuration status command
causes a block of data to be returned by the
addressed modem. The block reflects the
current configuration of the interface.
Notes:
1. Status only returned in Receive
Continuous mode.
2. Status only returned in Transmit
Continuous mode.
A–14
SNM-1000 Node Control Modem
Remote Control Operation
A.7.1
Modem Faults Status
Modem Faults Status
(Summary)
Modulator Status
Revision 3
MN/SNM1000.IOM
Status:
<channel_no> MC MFS_'cr'
Response:
<channel_no> MFS_'cr'
DMD_xxx'cr'
MOD_xxx'cr'
ITX_xxx'cr'
IRX_xxx'cr'
CEQ_xxx'cr''lf']
Status:
Response:
<channel_no> MC MS_'cr'
<channel_no> MS_'cr'
RF_xxx'cr'
MOD_xxx'cr'
SYN_xxx'cr'
DCS_xxx'cr'
AGC_xxx'cr'
SFLT_xx'cr''lf']
TX Burst Mode:
RF Output (ON/OFF) Actual Status, Not
Configured
Module (OK/FLT)
IF Synthesizer (OK/FLT)
Data Clock Synthesizer (OK/FLT)
AGC Level (OK/FLT)
Number of Stored Faults Logged (0
through 10)
Response:
<channel_no> MS_'cr'
RF_xxx'cr'
TX Continuous Mode:
RF Output (ON/OFF) Actual Status, Not
Configured
Module (OK/FLT)
IF Synthesizer (OK/FLT)
Data Clock Synthesizer (OK/FLT)
I Channel (OK/FLT)
Q Channel (OK/FLT)
AGC Level (OK/FLT)
Number of Stored Faults Logged (0
through 10)
MOD_xxx'cr'
SYN_xxx'cr'
DCS_xxx'cr'
ICH_xxx'cr'
QCH_xxx'cr'
AGC_xxx'cr'
SFLT_xx'cr''lf']
Demodulator Status
Status:
<channel_no> MC DS_'cr'
Response:
<channel_no> DS_'cr'
MOD_xxx'cr'
CD_xxx'cr'
SYN_xxx'cr'
ICH_xxx'cr'
QCH_xxx'cr'
DSCR_xxx'cr'
BERT_xxx'cr'
SFLT_xx'cr''lf']
A–15
RX Continuous Mode:
Demodulator (FLT/OK)
Modulator (FLT/OK)
Interface Transmit Side (FLT/OK)
Interface Receive Side (FLT/OK)
Common Equipment (FLT/OK)
RX Continuous Mode:
Demod Module (OK/FLT)
Carrier Detect (OK/FLT)
IF Synthesizer Lock (OK/FLT)
I Channel (OK/FLT)
Q Channel (OK/FLT)
Descrambler (OK/FLT)
BER Threshold (OK/FLT)
Number of Stored Faults Logged (0
through 10)
SNM-1000 Node Control Modem
Remote Control Operation
Interface Transmit
Side Status
Status:
Response:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC ITXS_'cr'
<channel_no> ITXS_'cr'
CLK_xxx'cr'
SFLT_xx'cr''lf']
TX Burst Mode:
<channel_no> ITXS_'cr'
CLK_xxx'cr'
TX Continuous Mode:
Selected Transmit Clock Activity
(OK/FLT)
Number of Stored Faults Logged (0
through 10)
SFLT_xx'cr''lf']
Interface Receive
Side Status
Common Equipment
Status
Status:
Response:
Status:
Response:
<channel_no> MC IRXS_'cr'
<channel_no> IRXS_'cr'
CLK_xxx'cr'
UNFL_xxx'cr'
OVFL_xxx'cr'
SFLT_xx'cr''lf']
<channel_no> MC CES_'cr'
<channel_no> CES_'cr'
M&C_xxx'cr'
INT_xxx'cr'
BAT_xxx'cr'
+5_xxx'cr'
+12_xxx'cr'
-12_xxx'cr'
MODE_xxxxxx'cr'
SFLT_xx'cr''lf']
Selected Transmit Clock Activity
(OK/FLT)
Number of Stored Faults Logged (0
through 10)
Selected Buffer Clock Activity (OK/FLT)
Buffer Underflow (OK/FLT)
Buffer Overflow (OK/FLT)
Number of Stored Faults Logged (0 through
10)
M&C Module (OK/FLT)
Data Interface Module (OK/FLT)
Battery/Clock (OK/FLT)
+5V Power Supply (OK/FLT)
+12V Power Supply (OK/FLT)
-12V Power Supply (OK/FLT)
Mode (LOCAL or REMOTE)
Number of Stored Faults Logged (0 through
10)
The common equipment status command
causes the return of a block of data
indicating the common equipment status.
A–16
SNM-1000 Node Control Modem
Remote Control Operation
A.7.2
Raw BER
Revision 3
MN/SNM1000.IOM
Error Performance Status
Status:
Response:
<channel_no> MC RBER_'cr'
<channel_no> RBER_xm.mE-ee'cr''lf']
Where:
x = < or > (data modifier to indicate that
the error rate is less than or greater
than the returned value).
m.m = 1.0 to 9.9 (error rate mantissa).
ee = 1 to 99 (error rate exponent).
Corrected BER
Status:
Response:
<channel_no> MC CBER_'cr'
<channel_no> CBER_xm.mE-ee'cr''lf']
Notes:
1. The 'x' (< or >) parameter is only
returned if the error rate has
exceeded the computational
resolution of the system.
2. 'No Data' is returned if the error rate
cannot be calculated.
3. 'Sampling' is returned if not enough
data is currently available to
calculate the error rate.
Where:
x = < or > (data modifier to indicate that
the error rate is less than or greater
than the returned value).
m.m = 1.0 to 9.9 (error rate mantissa).
ee = 1 to 99 (error rate exponent).
Notes:
1. The 'x' (< or >) parameter is only
returned if the error rate has
exceeded the computational
resolution of the system.
2. 'No Data' is returned if the error rate
cannot be calculated.
3. 'Sampling' is returned if not enough
data is currently available to
calculate the error rate.
A–17
SNM-1000 Node Control Modem
Remote Control Operation
Eb/N0 Status
Status:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC EBN0_'cr'
<channel_no> EBN0_xnn.ndB'cr''lf']
Where:
x = < or > (data modifier to indicate that
the Eb/N0 is less than or greater than the
returned value).
nn.n = 1.0 to 99.9 (Eb/N0 value).
Notes:
1. The 'x' (< or >) parameter is only
returned if the Eb/N0 has exceeded
the computational resolution of the
system.
2. 'No Data' returned if the Eb/N0
cannot be calculated.
3. 'Sampling' returned if not enough
data available to calculate the Eb/N0.
Modulator Rate
Status
Status:
Response:
<channel_no> MC MR_'cr'
<channel_no> MR_nnnn_mmm.mmm'cr''lf']
Where:
In TX Burst mode, nnnn = 1/2 or 3/4
(Coder rate).
In TX Continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4
(QPSK 3/4), 7/8 (QPSK 7/8), BP12
(BPSK 1/2), 8P23 (8PSK 2/3), OQ12
(OQPSK 1/2), OQ34 (OQPSK 3/4),
OQ78 (OQPSK 7/8), OQSK (OQPSK
1/1), BPSK (BPSK 1/1) (QPSK (QPSK
1/1), 2144 (BPSK 21/44), B516 (BPSK
5/16), 8P34 (8PSK 3/4).
mmm.mmm = Data rate in kHz.
Demodulator Rate
Status
Status:
Response:
<channel_no> MC DR_'cr'
<channel_no> DR_nnnn_mmm.mmm'cr''lf']
Where:
In RX Continuous mode,
nnnn = 1/2 (QPSK 1/2), [coder rate], 3/4
(QPSK 3/4), 7/8 (QPSK 7/8), BP12
(BPSK 1/2), 8P23 (8PSK 2/3), OQ12
(OQPSK 1/2), OQ34 (OQPSK 3/4),
OQ78 (OQPSK 7/8), OQSK (OQPSK
1/1), BPSK (BPSK 1/1) (QPSK (QPSK
1/1), 2144 (BPSK 21/44), B516 (BPSK
5/16), 8P34 (8PSK 3/4).
mmm.mmm = Data rate in kHz.
A–18
SNM-1000 Node Control Modem
Remote Control Operation
Receive Signal Level
Status
Status:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC RSL_'cr'
<channel_no> RSL_xsnn.ndBm'cr''lf']
Where:
x = < or > (data modifier to indicate that
the receive signal level is less than or
greater than the returned value).
s = + or - (receive signal level sign).
nn.n = 0.0 to 99.9 (receive signal level
magnitude).
Notes:
1. The 'x' (< or >) parameter is only
returned if the level has exceeded
the computational resolution of the
system.
2. 'No Data' is returned if the level
cannot be calculated.
3. 'Sampling' is returned if not enough
data is currently available to
calculate the level.
Current Sweep Value
Status:
Response:
<channel_no> MC CSV_'cr'
<channel_no> CSV_snnnnn'cr''lf']
Where:
x = < or > (data modifier to indicate that
the sweep offset value is less than or
greater than the returned value).
s = + or - (sweep offset from center).
nnnnn = 0 to 35000.
This command returns the current sweep
offset value.
Notes:
1. The 'x' (< or >) parameter is only
returned if the level has exceeded
the computational resolution of the
system.
2. 'No Data' is returned if the level
cannot be calculated.
3. 'Sampling' is returned if not enough
data is currently available to
calculate the level.
4. In RX Continuous mode only.
A–19
SNM-1000 Node Control Modem
Remote Control Operation
A.8
Revision 3
MN/SNM1000.IOM
Stored Faults
Information on stored faults is returned when requested. If no stored fault exists for a given
fault number, the words ‘NO FAULT’ will be returned instead of the normal time/date and
status information.
The following symbols are used to define the stored faults status commands.
•
•
•
•
•
•
•
Modulator
Stored Faults
Command:
Response:
Response:
Demodulator
Stored Faults
#
hh
mm
ss
MM
DD
YY
Fault number (0 through 9), '0' is the first fault stored.
Hours in 24-hour format.
Minutes.
Seconds.
Month.
Day.
Year.
<channel_no> MC MSF_#'cr'
<channel_no> MSF_# hh:mm:ss
MM/DD/YY'cr'
MOD_xxx'cr'
SYN_xxx'cr'
DCS_xxx'cr'
AGC_xxx'cr''lf']
<channel_no> MSF_# hh:mm:ss
MM/DD/YY'cr'
MOD_xxx'cr'
SYN_xxx'cr'
DCS_xxx'cr'
ICH_xxx'cr'
QCH_xxx'cr'
AGC_xxx'cr''lf']
Command:
<channel_no> MC DSF_#'cr'
Response:
<channel_no> DSF_# hh:mm:ss
MM/DD/YY'cr'
MOD_xxx'cr'
CD_xxx'cr'
SYN_xxx'cr'
ICH_xxx'cr'
QCH_xxx'cr'
DSCR_xxx'cr'
BERT_xxx'cr''lf']
A–20
TX Burst Mode:
Module (OK/FLT).
IF Synthesizer (OK/FLT).
Data Clock Synthesizer (OK/FLT).
AGC Level (OK/FLT).
TX Continuous Mode:
Module (OK/FLT).
IF Synthesizer (OK/FLT).
Data Clock Synthesizer (OK/FLT).
I Channel (OK/FLT).
Q Channel (OK/FLT).
AGC Level (OK/FLT).
RX Continuous Mode:
Demod module (OK/FLT).
Carrier Detect (OK/FLT).
IF Synthesizer Lock (OK/FLT).
I Channel (OK/FLT).
Q Channel (OK/FLT).
Descrambler (OK/FLT).
BER Threshold (OK/FLT).
SNM-1000 Node Control Modem
Remote Control Operation
Common
Equipment
Stored Faults
Command:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC CSF_#'cr'
<channel_no> CSF_# hh:mm:ss
MM/DD/YY'cr'
M&C_xxx'cr'
INT_xxx'cr'
BAT_xxx'cr'
+5_xxx'cr'
+12_xxx'cr'
-12_xxx'cr''lf']
Bulk
Command:
<channel_no> MC BCAS_'cr'
Consolidated
Response:
<channel_no>
Analog
BCAS_p1,p2,p3, . . . pn'cr''lf']
Status
Where: 'pn' is the last parameter returned.
Parameter
Number
1
(Note 1)
Monitor and Control Module (OK/FLT).
Data Interface Module (OK/FLT).
Battery/Clock (OK/FLT).
+5V Power Supply (OK/FLT).
+12V Power Supply (OK/FLT).
-12V Power Supply (OK/FLT).
This command is similar to the 'BCS_' command, but returns
modem analog parameters.
Parameter Name
(Command Reference)
Receive Signal Level
(ref. 'RSL_' command).
Description
p1 = xsnn.n, receive signal level in dBm.
2
Raw BER
(ref. 'RBER_' command).
p2 = xm.mE-ee.
3
Corrected BER
(ref. 'CBER_' command).
p3 = xm.mE-ee.
4
Eb/N0
(ref. ' EBN0 _' command).
p4 = xnn.n, Eb/N0 in dB.
5
Current Sweep Value
(ref. 'CSV_' command).
p5 = snnnnn, sweep offset value in Hz.
Notes:
1. Status only returned in Continuous mode.
2. Parameters 2 through 5 are dependent on carrier acquisition. If the decoder is not locked, empty data blocks are returned
(,,,,).
A–21
SNM-1000 Node Control Modem
Remote Control Operation
Bulk
Consolidated
Status
Command:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC BCS_'cr'
<channel_no> BCS_p1,p2,p3, . . .
pn'cr''lf']
This command causes bulk modem status to be returned.
To reduce the length of the response, message parameter
data are returned without identifiers. However, parameter
identification can be determined by order of return. Each
status parameter (except for the last parameter) is terminated
with a comma (','). The last parameter has the standard
message termination sequence ('cr''lf']).
Most of the data returned is formatted the same way as that
returned by any single command status request (refer to
Section A.3.2 for examples).
Where: 'pn' is the last parameter returned.
Parameter
Number
1
(Note 1)
Parameter Name
(Command Reference)
Modulator RF Output
(ref. 'RF_' command).
Description
p1 = n, where 'n' is '0' (OFF) or '1' (ON).
2
Modulator IF Frequency
(ref. 'MF_' command).
p2 = nnn.nnnn, IF frequency in MHz.
3
Modulator Rate
(ref. 'MR_' command).
p3 = nnnn_mmm.mmm, code rate/data rate in kbps.
4
Modulator Preset A assignment
(ref. 'ARMA_' command).
p4 = nnnn_mmm.mmm, code rate/data rate in kbps.
5
Modulator Preset B assignment
(ref. 'ARMB_' command).
p5 = nnnn_mmm.mmm, code rate/data rate in kbps.
6
Modulator Preset C assignment
(ref. 'ARMC_' command).
p6 = nnnn_mmm.mmm, code rate/data rate in kbps.
7
Modulator Preset D assignment
(ref. 'ARMD_' command).
p7 = nnnn_mmm.mmm, code rate/data rate in kbps.
8
Modulator Preset V assignment
(ref. 'ARMV_' command).
p8 = nnnn_mmm.mmm, code rate/data rate in kbps.
9
Modulator Power Offset
(ref. 'MPO_' command).
p9 = snn.n, modulator power offset in dB.
10
Modulator Output Power Level
(ref. 'MOP_' command).
p10 = snn.n, transmitter output power level in dBm.
11
Scrambler Enable
(ref. 'SE_' command).
p11 = n, where 'n' is '0' (OFF) or '1' (ON).
12
Differential Encoder Enable
(ref. 'DENC_' command).
p12 = n, where 'n' is '0' (OFF) or '1' (ON).
13
Modulator Type
(ref. 'MT_' command).
p13 = n, where 'n' is '0' (EFD), '1' (INTL), '2'(CSC), '3' (FDC),
or '4' (SDM51).
14
Modulator Encoder Type
(ref. 'MET_' command).
p14 = n, where 'n' is '0' (SEQ) or '1' (VIT).
15
Transmit BPSK Data Ordering
(ref. 'TDA_' command).
p15 = n, where 'n' is '0' (NRM), '1' (INV).
16
Carrier Only Mode ON/OFF.
p16 = n, where 'n' is '0' (OFF) or '1' (ON).
A–22
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
Bulk
Consolidated Status
(continued
Where: 'pn' is the last parameter returned.
Parameter
Number
17
Parameter Name
(Command Reference)
Demodulator IF Frequency
(ref. 'DF_' command).
Description
p17 = nnn.nnnn, demodulator IF frequency in MHz.
18
Demodulator Rate
(ref. 'DR_' command).
p18 = nnnn_mmm.mmm, code rate/data rate in kbps.
19
Demodulator Preset A Assignment
(ref. 'ADRA_' command).
p19 = nnnn_mmm.mmm, code rate/data rate in kbps.
20
Demodulator Preset B Assignment
(ref. 'ADRB_' command).
p20 = nnnn_mmm.mmm, code rate/data rate in kbps.
21
Demodulator Preset C Assignment
(ref. 'ADRC_' command).
p21 = nnnn_mmm.mmm, code rate/data rate in kbps.
22
Demodulator Preset D Assignment
(ref. 'ADRD_' command).
p22 = nnnn_mmm.mmm, code rate/data rate in kbps.
23
Demodulator Preset V Assignment
(ref. 'ADRV_' command).
p23 = nnnn_mmm.mmm, code rate/data rate in kbps.
24
Descrambler Enable
(ref. 'DE_' command).
p24 = n, where 'n' is '0' (OFF) or '1' (ON).
25
Differential Decoder Enable
(ref. 'DDEC_' command).
p25 = n, where 'n' is '0' (OFF) or '1' (ON).
26
RF Loopback
(ref. 'RFL_' command).
p26 = n, where 'n' is '0' (OFF) or '1' (ON).
27
IF Loopback
(ref. 'IFL_' command).
p27 = n, where 'n' is '0' (OFF) or '1' (ON).
(Note 1)
28
Sweep Center Frequency
(ref. 'SCF_' command).
p28 = snnnnn, sweep center frequency in Hz.
(Note 1)
29
Sweep Width Range
(ref. 'SWR_' command).
p29 = nnnnn, sweep range in Hz.
30
BER Threshold
(ref. 'BERT_' command).
p30 = xxxx, BER threshold.
31
Demodulator Type
(ref. 'DT_' command).
p31 = n, where 'n' is '0' (EFD), '1' (INTL), '2' (CSC), or '3'
(FDC).
32
Demodulator Decoder Type
(ref. 'DDT_' command).
p32 = n, where 'n' is '0' (SEQ) or '1' (VIT).
33
Receive BPSK Data
(ref. 'RDA_' command).
p33 = n, where 'n' is '0' (NRM),or '1' (INV).
34
Transmit Clock Source
(ref. 'TC_' command).
p34 = n, where 'n' is '0' (INT), '1' (REF), or '2' ( EXT).
(Note 1)
A–23
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
Bulk
Consolidated Status
(continued
Where: 'pn' is the last parameter returned.
Paramete
r
Number
35
Parameter Name
(Command Reference)
Transmit Clock Phase
(ref. 'TCP_' command).
p35 = n, where 'n' is '0' (NRM), '1' (INV), or '2' (AUTO).
36
Buffer Clock Source
(ref. 'BC_' command).
p36 = n, where 'n' is '0' (INT), '1' (REF), '2' (EXT), or '3' (SAT).
37
Receive Clock Phase
(ref. 'RCP_' command).
p37 = n, where 'n' is '0' (NRM) or '1' (INV).
38
Baseband Loopback
(ref. 'BBL_' command).
p38 = n, where 'n' is '0' (OFF) or '1' (ON).
(Note 1)
39
Interface Buffer Programming
(ref. 'IBP_' command).
p39 = n, where 'n' is '0' (BITS) or '1' (MS).
(Note 1)
40
Interface Buffer Size
(ref. 'IBS_' command).
p40 = nnnnnn, buffer size in bits or milliseconds.
41
Modem Operation Mode
(ref. 'MOM_' command).
p41 = n, where 'n' is '1' (TX_ONLY), '2' (RX_ONLY), or '3'
(DUPLEX).
42
Modem Remote/Local Mode.
p42 = n, where 'n' is '0' (LOCAL) or '1' (REMOTE).
43
Not valid.
44
Not valid.
45
Not valid.
46
Not valid.
47
Not valid.
48
Not valid.
49
Not valid.
50
Not valid.
51
Not valid.
52
Not valid.
53
Not valid.
54
Not valid.
55
Not valid.
56
Transmit Mode Selection
(ref. 'TXM_' command).
p56 = n, where 'n' is '1' (BURST) or '2' (CONTINUOUS).
57
Modulator Preamble Selection
(ref. 'MPRE_' command).
p57 = n, where 'n' is '1' (PREAMBLE) or '2' (PREAMBLE 2).
(Note 1)
(Note 3)
(Note 2)
Description
A–24
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
Bulk
Consolidated Status
(continued
Where: 'pn' is the last parameter returned.
Paramete
r
Number
58
Parameter Name
(Command Reference)
Description
Receive Mode Selection
(ref. 'RXM_' command).
p58 = n, where 'n' is '2' (CONTINUOUS)
(Note 1)
60
Reed-Solomon Encoder Enable
(ref. 'RSEN_' command).
p60 = n, where 'n' is '0' (OFF,) or '1' (ON).
(Note 1)
61
Reed-Solomon Decoder Enable
(ref. 'RSDE_' command).
p61 = n, where 'n' is '0' (OFF), '1' (ON), or '2' (CORR_OFF).
Notes:
1. Parameters only valid in Transmit and Receive Continuous mode.
2. Parameters only valid in Transmit Continuous mode.
3. For any parameter other than the last parameter that is not returned, a comma (',') will be returned.
A–25
SNM-1000 Node Control Modem
Remote Control Operation
Bulk
Consolidated
Status Faults
Command:
Response:
Revision 3
MN/SNM1000.IOM
<channel_no> MC BCSF_'cr'
<channel_no>
BCSF_abcdefghijkl'cr''lf']
This command causes all modem fault status information to be
returned. To reduce the length of the response, fault status is
embedded into the bit structure of the characters that are
returned. Faults are indicated by a binary 1 in the designated
bit position.
Where:
Character a: Modulator fault status character 1.
Bit 6 = 1 always.
Bit 5 = Modulator module fault.
Bit 4 = RF output status. Actual not programmed status
(1 = ON, 0 = OFF).
Bit 3 through Bit 0 = Binary representation (0 to 10) of the
number of modulator stored faults.
Character b: Modulator fault status character 2.
Bit 6 = 1 always.
Bit 5 = IF Synthesizer.
Bit 4 = Data Clock Synthesizer.
Bit 3 = reserved.
Bit 2 = reserved.
Bit 1 = AGC Level.
Bit 0 = reserved.
Note: In TX Burst mode only.
Character b: Modulator fault status character 2.
Bit 6 = 1 always.
Bit 5 = IF Synthesizer.
Bit 4 = Data Clock Synthesizer.
Bit 3 = I Channel.
Bit 2 = Q Channel.
Bit 1 = AGC Level.
Bit 0 = reserved.
Note: In TX Continuous mode only.
Character c: Modulator fault status character 3.
Bit 6 = 1 always.
Bit 5 = reserved.
Bit 4 = reserved.
Bit 3 = reserved.
Bit 2 = reserved.
Bit 1 = reserved.
Bit 0 = reserved.
Character d: Demodulator fault status character 1.
Bit 6 = 1 always.
Bit 5 = Demod module fault.
Bit 4 = Carrier detect status (0 for decoder lock).
Bit 3 through Bit 0 = Binary representation (0 to 10) of the
number of demodulator stored faults.
Note: In RX Continuous mode only.
Character e: Demodulator fault status character 2.
Bit 6 = 1 always.
Bit 5 = IF Synthesizer Lock.
Bit 4 = I Channel.
Bit 3 = Q Channel.
Bit 2 = Descrambler.
Bit 1 = BER threshold.
Bit 0 = reserved.
Note: In RX Continuous mode only.
A–26
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
Character f: Demodulator fault status character 3.
Bit 6 = 1 always.
Bit 5 = reserved.
Bit 4 = reserved.
Bit 3 = reserved.
Bit 2 = reserved.
Bit 1 = reserved.
Bit 0 = reserved.
Character g: Interface transmit side faults character 1.
Bit 6 = 1 always.
Bit 5 = reserved.
Bit 4 = reserved.
Bit 3 through Bit 0 = Binary representation (0 to 10) of the
number of interface transmit side stored faults.
Character h: Interface transmit side faults character 2.
Bit 6 = 1 always.
Bit 5 = Selected Transmit Clock Activity.
Bit 4 = reserved.
Bit 3 = reserved.
Bit 2 = reserved.
Bit 1 = reserved.
Bit 0 = reserved.
Note: In TX Burst mode only.
Character i: Interface receive side faults character 1.
Bit 6 = 1 always.
Bit 5 = reserved.
Bit 4 = reserved.
Bit 3 through Bit 0 = Binary representation (0 to 10) of the
number of interface receive side stored faults.
Character j: Interface receive side faults character 2.
Bit 6 = 1 always.
Bit 5 = Selected Buffer Clock Activity.
Bit 4 = Buffer Underflow.
Bit 3 = Buffer Overflow.
Bit 2 = reserved.
Bit 1 = reserved.
Bit 0 = reserved.
Note: In RX Continuous mode only.
Character k: Common equipment fault status character 1.
Bit 6 = 1 always.
Bit 5 = Monitor and Control Module.
Bit 4 = Interface Module.
Bit 3 through Bit 0 = Binary representation (0 to 10) of the
number of common equipment stored faults.
Character l: Common equipment fault status character 2.
Bit 6 = 1 always.
Bit 5 = Battery/Clock.
Bit 4 = +5V power supply.
Bit 3 = +12V power supply.
Bit 2 = -12V power supply.
Bit 1 = reserved.
Bit 0 = reserved.
Change
Status
Command:
Response:
Character m: Interface Reed-Solomon unavailable seconds.
Bit 6 = 1 always.
Bit 5 = not used.
Bit 4 = not used.
Bit 3 through Bit 0 = reserved.
This command indicates that a change has or has not occurred
on either the BCS_ or the BCSF_ response since the last BCS_
<channel_no> MC CS_'cr'
<channel_no> CS_x'cr''lf']
A–27
SNM-1000 Node Control Modem
Remote Control Operation
Revision 3
MN/SNM1000.IOM
or BCSF_ poll.
Where: the x character is defined as follows:
@ = no change since last BCS_ and BCSF_ polls.
A = BCS_ response has changed since last BCS_ poll.
B = BCSF_ response has changed since last BCSF_ poll.
C = Both responses have changed since last BCS_ and
BCSF_ polls.
Equipment
Type
Command:
Response:
<channel_no> MC ET_'cr'
<channel_no>
ET_tttttttt_xxx.yyy.zzz'cr''lf']
This command returns the equipment type and the software
version of the addressed device.
Where:
tttttttt = Equipment type.
xxx.yyy.zzz = Software version.
Modem
Monitor and
Contro
Firmware
Information
Command:
Response:
<channel_no> MC MCFI_'cr'
<channel_no> MCFI_'cr'
VER_xxx.yyy.zzz'cr'
FW/nnnnnn-ddr'cr'
mm/dd/yy'cr''lf']
Where:
xxx.yyy.zzz = Software version number (0.0.0 to
999.999.999).
nnnnnn = Firmware number (0 to 999999).
dd = Firmware dash number (0 to 99).
r = Firmware revision (-, or A to Z).
Modem Data
ROM
Firmware
Information
Command:
Response:
<channel_no> MC DFI_'cr'
<channel_no> DFI_'cr'
DSP_FW/nnnnnn-ddr'cr'
DSP_mm/dd/yy'cr'
FPGA_FW/nnnnnn-ddr'cr'
FPGA_mm/dd/yy'cr''lf']
Where:
nnnnnn = Firmware number (0 to 999999).
dd = Firmware dash number (0 to 99).
r = Firmware revision (-, or A to Z).
A–28
SNM-1000 Node Control Modem
Remote Control Operation
A.9
Revision 3
MN/SNM1000.IOM
Unsolicited Responses
The following strings are generated by the DCE to reflect events which are not directly
related to commands typed from the DTE. They generally reflect the results of an earlier
command.
To ensure that a response is never inserted in the midst of another string, the following
strings will not start until any transmission in progress has been completed. However, if a
partial line has been entered from the DTE to the DCE, this strict sequence control causes
indefinite waiting by the response string. The response string shall wait until the partial
line is completed.
A.9.1
Messages from NMS
<channel_no> CONGESTION
Channel cannot be assigned because there is no
satellite spectrum space available.
<channel_no> BUSY
Destination end is busy.
<channel_no> NO CONNECT <error code>
NMS was not able to complete the connection.
Error Type
Failure Terminate.
Invalid Request.
<channel_no> CONNECT
Received when a connection is made.
<channel_no> DISCONNECT <result code>
Received when a connection is broken.
Result Type
Path Ok.
Code
0
Calling Party Busy.
1
Failure Terminate.
2
Invalid Request.
3
Normal Termination.
4
Network Busy.
5
Critical Fault.
6
A–29
SNM-1000 Node Control Modem
Remote Control Operation
<channel no> CS <calling phone number>
<called phone number>
<status>
<cause>
<subcause>
<channel_no> MM <phone_no> <message>
A.9.2
Revision 3
MN/SNM1000.IOM
Call Status
<phone number> Calling phone number
<dest node>
Destination Node Id
<dest channel>
Destination Channel No.
<status>
0
1
2
3
4
5
6
Description
Path Ok
Channel busy
Failure
Invalid phone number
Normal Termination
Network Busy
Critical Fault
<cause> and
Information only
<subcause>
Multipoint Message
<phone_no>
Source connection phone
number or zero.
<message>
Message from source node.
List of Cause Codes
The complete list of Cause codes is given below. These are primarily used to determine
what description of the call termination is included in the completed call log. The NMS
and Node columns define whether the cause code is generated by the NMS or the Node,
or whether both may generate it.
A–30
SNM-1000 Node Control Modem
Remote Control Operation
Value
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
A.9.3
Name
cause_Unknown
cause_NodeChanBusy
cause_HuntGrpBusy
cause_NoAnsTimer
cause_NoCarrier
cause_CarrierLost
cause_ISDNFault
cause_ModemProg
cause_IncompType
cause_NotInCircuit
cause_InvalidNum
cause_DoesNotExist
cause_NotOnline
cause_NotEnabled
cause_UserHangUp
cause_NodeHangUp
cause_RTSDrop
cause_NMSOperator
cause_CallTimer
cause_NoBandwidth
cause_NoPower
cause_SequenceError
cause_PreEmption
cause_NoPowerNoBW
cause_IncompVoiceCap
cause_IncompPhNum
cause_InvalidVfduCmd
cause_NotInCall
cause_InvalidMember
cause_RequestInProg
cause_AlreadyInCall
cause_NoReturn
Revision 3
MN/SNM1000.IOM
NMS
x
x
x
Node
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Description
No more detail available
Calling or called Node/Ch is busy
All numbers in hunt group are busy
No answer timer expired before going offhook
Carrier lock was never achieved
Carrier lock was achieved, but then lost
ISDN faults to be defined
General Modem Programming failure
Incompatible modem types: voice/data, voice/ISDN
The specified node is not online
Number has invalid length, characters or is not defined
The specified node/channel/circuit is not in database
The specified node is not online
The specified node or channel is not enabled
User went on hook
Call terminated from user port on remote node
Call terminated when RTS went inactive
Call terminated by NMS
Call term by the maximum call duration timer
No bandwidth available
No power is available
Commands sent out of sequence
Pre-empted to free resources for high-priority call
No power and no bandwidth available
Attempt to mix G.728 + G.729 voice circuit
Calling side PPTREQ # not equal PTTASSIGN #
VFDU Card rejected DAC Command
MPDRequest, target node/chan not a member
MPDRequest, action not allowed for this member
MPDRequest, call member is busy with a request
MPDRequest, cannot add node/chan already in call
MPDRequest, return off attempt with no return active
Cause and Subcause Codes Generated By NMS
The list of Cause and corresponding Subcause codes, which are generated by the NMS,
is given below. These are used to give the maximum level of detail possible in describing
why a call terminated. It is used primarily for diagnostic purposes. Note that each Cause
code has its own list of Subcause definitions; a Subcause from one Cause cannot be used
with another, unless it is also defined under that Cause. Some Cause values have no
Subcause list; these would always use subcause_Unknown, which is defined with a
value of 0. Even where sub causes are listed, subcause_Unknown is still valid.
A–31
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Remote Control Operation
Revision 3
MN/SNM1000.IOM
Example
Name
Status
cause_NodeChanBusy
term_Busy
subcause_CannotCallSelf
cause_HuntGrpBusy
term_Busy
Description
Calling or called node/Ch is busy
Calling party attempted to call themselves
All numbers in hunt group are busy
cause_IncompType
subcause_VoiceDataConf
term_Invalid
Incompatible modem types; voice/data, voice/ISDN
Attempt to connect voice and data modems
0x09
cause_NotInCircuit
term_Invalid
The specified node/chan is not part of the circuit
0x0A
cause_InvalidNum
term_Invalid
Number has invalid length, characters or is not
defined
A node/channel cannot call itself
The number is not in the database
Cause
0x01
Subcause
0x07
0x02
0x08
0x05
0x07
0x0F
subcause_CannotCallSelf
subcause_NotDefined
cause_DoesNotExist
subcause_ChanError
subcause_NodeError
subcause_CircuitError
term_Invalid
0x01
0x02
0x03
The specified node/channel/circuit is not in database
Channel is not in database
Node is not in database
Circuit is not in database
cause_NotOnLine
subcause_ChanError
subcause_NodeError
term_Invalid
0x01
0x02
Node is not responding to the NMS
Channel is not online
Node is not online
cause_NotEnabled
subcause_ChanError
subcause_NodeError
subcause_AccessTime
term_Invalid
0x01
0x02
0x04
The specified node/channel/circuit is not enabled
Channel is not enabled
Node is not enabled
Channel is not available, outside its access time
0x11
cause_NMSOperator
term_Normal
Call terminated by NMS
0x13
cause_NoBandwidth
term_NetworkBusy
No bandwidth available
cause_NoPower
subcause_NoPowerAtSite
subcause_NoPowerAtSat
term_NetworkBusy
0x03
0x04
No power is available
No power at the site
No power at the site
cause_SequenceError
subcause_NoPathStatus
subcause_InvalidMsg
term_Invalid
0x0D
0x0E
Messages sent out of sequence by node
Path status not received from one or both nodes
An invalid message received during call sequence
cause_PreEmption
term_FailureRetry
Pre-empted to free resources for high-priority call
cause_NoPowerNoBW
subcause_NoPowerAtSite
subcause_NoPowerAtSat
term_NetworkBusy
No power and no bandwidth available
No power at the site
No power at satellite
cause_NotInCall
term_FailureRetry
The specified node/chan is not part of the call
cause_InvalidMember
subcause_Chairman
subcause_Forward
subcause_Return
term_FailureRetry
Request not legal for this call member
Request not legal for the call Chairman
Request not legal for the forward transmitter
Request not legal for the return transmitter
0x1D
cause_RequestInProg
term_FailureRetry
This member already has a request pending
0x1E
cause_AlreadyInCall
term_FailureRetry
Attempt to add a member already in the call
0x1F
cause_NoReturn
term_FailureRetry
Attempt to turn off return, with no return active
0x0B
0x0C
0x0D
0x14
0x15
0x16
0x17
0x03
0x04
0x1B
0x1C
0x20
0x21
0x22
A–32
SNM-1000 Node Control Modem
Remote Control Operation
A.9.4
Cause
0x00
0x01
0x04
0x05
0x06
Subcause
0x00-0x0D
0x0E
0x0F-0xFF
0x07
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x30
0x31
0x18
0x19
0x1A
0x03
Revision 3
MN/SNM1000.IOM
Cause and Subcause Codes Generated By Node
Name
cause_Unknown
cause_NodeChanBusy
cause_NoCarrier
cause_CarrierLost
cause_ISDNFault
reserved
subcause_InvalidRate
reserved
cause_ModemProg
subcause_Unknown
subcause_InvalidOpCode
subcause_OpCodeFault
subcause_InvalidResponseBuffer
subcause_InvalidParm
subcause_InvalidChan
subcause_AccessDenied
subcause_ChannelOffline
subcause_InvalidRequestBuffer
subcause_InvalidNodeStartupCode
subcause_InvalidNodeDisableOption
subcause_InvalidNodeStatusOption
subcause_InvalidTxFreq
subcause_InvalidRxFreq
subcause_InvalidRate
subcause_InvalidPower
subcause_InvalidTxClock
subcause_ChannelLocked
subcause_ModemFault
subcause_NoCarrier
subcause_InvalidParmBuffer
subcause_CallNotActive
subcause_ModemNotPresent
subcause_ModemFaultDetected
subcause_InvalidEncoderType
subcause_InvalidDecoderType
subcause_InvalidBus
subcause_InvalidSweep
subcause_NoBufferAvail
subcause_InvalidDEncoder
subcause_InvalidDDecoder
subcause_ChannelNotInitialized
subcause_ InvalidTransmitMode
subcause_ InvalidBuffersize
subcause_ InvalidAupcOption
subcause_ InvalidAupcNominalPower
subcause_ InvalidAupcMax
subcause_ InvalidAupcMin
subcause_ InvalidAupcSP
subcause_ InvalidAupcMaxRate
subcause_ InvalidLocalAction
subcause_ InvalidRemoteAction
subcause_ InvalidModemType
subcause_ InvalidFramingType
cause_IncompVoiceCap
cause_IncompPhNum
cause_InvalidVfduCmd
cause_NoAnsTimer
Example
Status
term_PathOk
term_Busy
term_FailureRet
term_FailureRet
term_FailureRet
Description
Called node/channel is busy
Carrier lock was never achieved
Carrier lock was achieved, but then lost
ISDN faults to be defined
Invalid data rate for ISDN call
term_FailureRet
term_FailureRet
term_FailureRet
term_FailureRet
term_Normal
A–33
General Modem Programming failure
Generic subcause code
Internal error code
Internal error code
Internal error code
Internal error code
Channel number out of range
Channel access denied
Channel went offline
Internal error code
Internal error code
Internal error code
Internal error code
Invalid transmit frequency
Invalid receive frequency
Invalid Modulation ,code rate, data rate selection
Invalid power level
Invalid transmit clock selection
Channel already processing call
Channel not responding to periodic status request
Carrier Not Detected
Internal error code
Call not in progress
Internal error code
Modem offline
Invalid Encoder Selection
Invalid Decoder Selection
Channel not defined on specific bus
Invalid demodulator sweep rate range
Internal error code
Invalid differential encoder selection
Invalid differential decoder selection
Internal error code
Invalid Transmit Mode selection
Invalid Modem buffer size
Invalid Aupc Option
Invalid Aupc Nominal Power
Invalid Aupc Max Power
Invalid Aupc Min Power
Invalid Aupc Set Point
Invalid Aupc Max Rate
Invalid Aupc Local Action
Invalid Aupc Remote Action
Internal error code
Invalid Framing Selection
Attempt to mix G.728 + G.729 voice circuit
Calling side PPTREQ # not equal PTTASSIGN #
VFDU Card rejected DAC Command
No answer timer expired without going offhook
SNM-1000 Node Control Modem
Remote Control Operation
Cause
0x0E
0x0F
0x10
0x12
Subcause
Revision 3
MN/SNM1000.IOM
Name
cause_UserHangUp
cause_NodeHangUp
cause_RTSDrop
cause_CallTimer
Example
Status
term_Normal
term_Normal
term_Normal
term_Normal
A–34
Description
User went on hook
Call terminated from user port on remote node
Call terminated when RTS went inactive
Call term by the maximum call duration timer
METRIC CONVERSIONS
Units of Length
Unit
Centimeter
Inch
Foot
Yard
Mile
Meter
Kilometer
Millimeter
1 centimeter
—
0.3937
0.03281
0.01094
6.214 x 10-6
0.01
—
—
1 inch
2.540
—
0.08333
0.2778
1.578 x 10-5
0.254
—
25.4
1 foot
30.480
12.0
—
0.3333
1.893 x 10-4
0.3048
—
—
1 yard
91.44
36.0
3.0
—
5.679 x 10-4
0.9144
—
—
1 meter
100.0
39.37
3.281
1.094
6.214 x 10-4
—
—
—
1 mile
1.609 x 105
6.336 x 104
5.280 x 103
1.760 x 103
—
1.609 x 103
1.609
—
1 mm
—
0.03937
—
—
—
—
—
—
1 kilometer
—
—
—
—
0.621
—
—
—
Temperature Conversions
° Fahrenheit
Unit
° Centigrade
Formulas
0
—
C = (F - 32) * 0.555
(water freezes)
32° Fahrenheit
100
—
F = (C * 1.8) + 32
(water boils)
212° Fahrenheit
273.1
—
(absolute 0)
-459.6° Fahrenheit
Units of Weight
Gram
Ounce
Avoirdupois
Ounce
Troy
Pound
Avoir.
Pound
Troy
Kilogram
—
0.03527
0.03215
0.002205
0.002679
0.001
1 oz. avoir.
28.35
—
0.9115
0.0625
0.07595
0.02835
1 oz. troy
31.10
1.097
—
0.06857
0.08333
0.03110
1 lb. avoir.
453.6
16.0
14.58
—
1.215
0.4536
1 lb. Troy
373.2
13.17
12.0
0.8229
—
0.3732
1 kilogram
1.0 x 103
35.27
32.15
2.205
2.679
—
Unit
1 gram
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