Comtech EF Data DT-4500 DT-4503, DT-4503C, DT-4503D, DT-4503E, DT-4510, DT-4510D, DT-4511, DT-4512, DT-4512E, DT-4513, DT-4513E Down Converter Installation and Operation Manual
Below you will find brief information for DT-4500 DT-4503, DT-4500 DT-4503C, DT-4500 DT-4503D, DT-4500 DT-4503E, DT-4500 DT-4510, DT-4500 DT-4510D, DT-4500 DT-4511, DT-4500 DT-4512. These down converters are designed for use in communication systems or in satellite downlink data systems for the transmission of SCPC, DAMA, and TDMA communication signals. The Down Converters can also be used in communications system applications with full transponder HDTV and analog TV.
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DT-4500 Series
Down Converters
Installation and Operation Manual
Part Number MN/DT4500.IOM
Revision 1
Errata A
Subject:
Date:
Document:
Added A.1.1 Configure Mute Mode
December 16, 2005
DT-4500 Series, Down Converters, Installation and Operation
Part Number:
Manual, Revision 1, dated June 15, 2005
MN/DT4500.EA1
Collating Instructions:
Attach this page to page A-1
Comments:
Comtech EF Data Documentation Update
Add paragraph A.1.1 to read:
Change Specifics:
A.1.1 Configure Mute Mode
Turns the mute mode ON or OFF. When mute mode is OFF (default), the unit will mute upon changing RF frequency. When mute mode is ON, the unit will remain whatever its mute state upon changing RF frequency.
Command Details
Config. Mute Mode: <DEV/CMM_xxx'cr' xxx = ON or OFF
Confirmation: >DEV/CMM_xxx'cr''lf']
Mute Mode Status: <DEV/CMM_'cr'
Confirmation: >DEV/CMM_xxx'cr''lf']
Filename: T_ERRATA
1
Errata B
Subject:
Date:
Document:
Added A.1.1.1 Packed Configuration Status
December 16, 2005
DT-4500 Series, Down Converters, Installation and Operation
Part Number:
Manual, Revision 1, dated June 15, 2005
MN/DT4500.EB1
Collating Instructions:
Attach this page to page 41
Comments:
Comtech EF Data Documentation Update
Add paragraph A.1.1.1 to read:
Change Specifics:
A.1.1.1 Packed Configuration Status
Status:
>DEV/PACRCS_aaaabbbcdeffgghijkl'cr''lf']
where: aaaa = # of 125kHz steps above base frequency
1 bbb = # of 0.25 dB steps above 0.00 dB c = 1 if Transmitter ON, 0 if OFF, 2 if Cold d = 1 if unit ONLINE, 0 if OFFLINE
2 e = 1 if Redundancy ON, else 0 ff = converter # (01-12,BU or 00 if e = 0) gg = 00 if 'ff' is 00 (redundancy OFF) gg = chain length (01-12) if 'ff' is BU gg = XX if 'ff' = 01 - 12 h = A if Auto Mode, M if Manual
3
I = 1 if Cold Start Enabled, else 0 j = 1 if Auto recovery enabled, else 0
K = 1 if an Ext. Ref is present, else 0 l = 1 if Remote Mode, 0 if Local Mode
Notes: 1
If the converter is 1 kHz step size, this will be the number of 1 kHz steps above the base frequency. Also, this will be 5 bytes(aaaaa) long for model 4513X converters with 125 KHz frequency step size. This will be 7 bytes(aaaaaaa) long for all 1KHz step size converters.
2
If the converter is 0.1 -dB step size, this will be the number of 0.1 -dB steps above the base frequency
3
If it is a backup Converter, it is always ‘A’.
4
If it is the primary converter, gg = P1 or P2 (single or dual polarity system.
Filename: T_ERRATA
1
DT-4500 Series
Comtech EF Data is an ISO
9001 Registered Company
Down Converters
Installation and Operation Manual
Part Number MN/DT4500.IOM
Revision 1
June 15, 2005
Copyright © Comtech EF Data, 2001. 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.
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
C
USTOMER
S
UPPORT
Contact the Comtech EF Data Customer Support Department for:
Product support or training
Information on upgrading or returning a product
Reporting comments or suggestions concerning manuals
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)
480.333.2161 FAX or, E-Mail can be sent to the Customer Support Department at: [email protected]
Contact us via the web at www.comtechefdata.com
.
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or replacement:
1. Request a Return Material Authorization (RMA) number from the
Comtech EF Data Customer Support Department.
2. Be prepared to supply the Customer Support representative with the model number, serial number, and a description of the problem.
3. To ensure that the product is not damaged during shipping, pack the product in its original shipping carton/packaging.
4. Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.)
For more information regarding the warranty policies, see Warranty Policy, p. xii. ii
Errata C
Subject:
Date:
Document:
Added Dual IF Rack Mount Converters
August 28, 2006
DT-4500 Series, Down Converters, Installation and Operation
Part Number:
Manual, Revision 1, dated June 15, 2005
MN/DT4500.EC1
Collating Instructions:
Attach this page to page 25
Comments:
Comtech EF Data Documentation Update
Add the attached procedure to System Operation
Change Specifics:
Filename: T_ERRATA
1
Dual IF Rack Mount Converters
Comtech EF Data offers converters with the ability to switch the output IF frequency (Downconverters) and/or the input IF frequency (Upconverters) from 70 MHz to 140 MHz or vice versa. The actual IF bandwidth is maintained as the standard
± 18 MHz (± 20 MHz) of the 70 MHz configurations.
The software modification required for the implementation of the IF frequency switching are:
1. A front panel command to allow the output IF to switch from 70MHz to 140. a. The new selection is located in the “Configuration” menu tree. The “normal”
FREQ/ATT/MUT menu is split into two. First menu screen now has “RF FRE= XXXXX
MHz on top line, with “IF FRE= XXX MHz” and “Rx= XXX” on second line. A second menu screen contains the attenuator setting. b. Mute behavior after changing the IF frequency is the same as the normal mute behavior after changing the RF frequency.
2. A new remote command is implemented to accomplish the identical operation as in (1). a. Command structure similar to the RF frequency selection.
The default is 70 MHz
Command Details
Set IF Frequency: <DEV/IFF_xxx'cr' (where xxx is either 140 or 70 without requiring leading zero.
Confirmation: >DEV/IFF_ xxx'cr''lf'] (where xxx is either 140 or 70 without requiring leading zero.
Retrieve Frequency: <DEV/IFF_'cr'
Confirmation: >DEV/IFF_ xxx'cr''lf'] (where xxx is either 140 or 70 without requiring leading zero.
Mute behavior after changing the IF frequency would be the same as the mute behavior after changing the RF frequency.
Redundant operation
The customer can not “mix” dual IF converters with standard converters in a redundant system
Filename: T_ERRATA
2
Table of Contents
Customer Support......................................................................................................................... ii
FIGURES ......................................................................................................................VII
TABLES.......................................................................................................................VIII
About this Manual ....................................................................................................................... ix
Conventions and References ....................................................................................................... ix
Metric Conversion ....................................................................................................................... ix
Trademarks .................................................................................................................................. ix
EMC Compliance......................................................................................................................... ix
Federal Communications Commission (FCC) ........................................................................... x
Safety Compliance ....................................................................................................................... xi
EN 60950 ....................................................................................................................................... xi
Warranty Policy.......................................................................................................................... xii
CHAPTER 1. INTRODUCTION.................................................................................... 1
1.1 Overview .................................................................................................................................. 1
1.2 Functional Description ........................................................................................................... 2
1.3 Specifications ........................................................................................................................... 4
1.4 Physical Configuration ......................................................................................................... 15
1.5 Front Panel Display .............................................................................................................. 16
1.6 Front Panel Test Point Samples........................................................................................... 16
1.7 Prime Power Switch.............................................................................................................. 16
iii
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
CHAPTER 2. INSTALLATION................................................................................... 19
2.1 Unpacking and Inspection.................................................................................................... 19
2.2 Rack Mount Installation....................................................................................................... 19
2.3 Prime Power Connection...................................................................................................... 19
2.4 Cable Connections ................................................................................................................ 20
2.4.1 Rear Panel Connections ................................................................................................... 20
2.4.2 RS-485/RS-232C Interface (COM 1), Connector J1 ....................................................... 21
2.4.3 High Speed Bus (HSB), Connector J3............................................................................. 22
2.4.4 Summary Fault Output (RELAY), Connector P1............................................................ 22
2.4.5 Cable Connections For Non-Redundant System Operation ............................................ 23
2.4.6 Cable Connections For Redundant System Operation..................................................... 23
CHAPTER 3. SYSTEM OPERATION ........................................................................ 25
3.1 Overview ................................................................................................................................ 25
3.2 Switching Power ON............................................................................................................. 27
3.3 Operation ............................................................................................................................... 27
3.3.1 Converter Commands ...................................................................................................... 35
3.3.2 Configuration Functions Menu........................................................................................ 36
3.3.3 Pre-select Function Menu ................................................................................................ 36
3.3.4 Monitor Status Function Menu ........................................................................................ 37
3.3.5 Current Faults Function Menu......................................................................................... 37
3.3.6 Stored Faults .................................................................................................................... 38
3.3.7 Utility Function Menu...................................................................................................... 39
APPENDIX A. REDUNDANT SYSTEM OPERATION ............................................... 41
A.1 Overview ............................................................................................................................... 41
A.2 Backup Converter ................................................................................................................ 42
A.2.1 High Speed Bus (HSB) ................................................................................................... 42
A.2.2 Detachable Modules........................................................................................................ 42
A.3 Redundant Configurations.................................................................................................. 43
A.4 Redundant System Configuration ...................................................................................... 49
A.4.1 Initial Configuration........................................................................................................ 49
A.4.2 Automatic Configuration Verification ............................................................................ 50
A.4.3 Manual Configuration/Verification................................................................................. 52
A.4.4 Offset Adjustment ........................................................................................................... 54 iv
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
A.4.5 Redundancy Systems - Converter Removal.................................................................... 54
APPENDIX B. REMOTE CONTROL.......................................................................... 57
B.1 General .................................................................................................................................. 57
B.2 Protocol ................................................................................................................................. 58
B.2.1 Transmission Mode ......................................................................................................... 58
B.2.2 Baud Rate ........................................................................................................................ 58
B.2.3 Format ............................................................................................................................. 58
B.2.4 Character Set ................................................................................................................... 58
B.2.5 Response Timeout ........................................................................................................... 58
B.2.6 Bus Inactivity Requirement............................................................................................. 58
B.3 Access Methods..................................................................................................................... 59
B.3.1 Direct Access................................................................................................................... 59
B.3.2 Indirect Access ................................................................................................................ 59
B.4 Addresses............................................................................................................................... 60
B.4.1 Physical Address ............................................................................................................. 60
B.4.2 Virtual Address ............................................................................................................... 60
B.5 Message Structure................................................................................................................ 61
B.5.1 Start Character................................................................................................................. 61
B.5.2 Device Address ............................................................................................................... 61
B.5.3 Command ........................................................................................................................ 61
B.5.4 Confirmation Response ................................................................................................... 61
B.5.5 Error Response ................................................................................................................ 62
B.5.6 End Of Message .............................................................................................................. 62
B.6 Command/Response Pairs................................................................................................... 63
B.6.1 Utility Commands ........................................................................................................... 63
B.6.2 Configuration Commands ............................................................................................... 66
B.6.3 Modes .............................................................................................................................. 69
B.6.4 Status Commands............................................................................................................ 71
B.6.5 Stored Alarm ................................................................................................................... 75
B.7 Error Processing................................................................................................................... 77
B.7.1 General Errors ................................................................................................................. 77
B.7.2 Configuration Errors ....................................................................................................... 77
B.7.3 Mode Errors..................................................................................................................... 77
B.7.4 Time-Outs........................................................................................................................ 77
B.8 Converter Remote Command Summary ........................................................................... 78
v
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
APPENDIX C. THEORY OF OPERATION................................................................. 81
C.1 Applications .......................................................................................................................... 81
C.2 RF Signal Conversion .......................................................................................................... 82
C.3 Monitor & Control............................................................................................................... 84
C.4 Installation, Operation and Maintenance.......................................................................... 84
APPENDIX D. MAINTENANCE AND TROUBLESHOOTING ................................... 85
D.1 Overview ............................................................................................................................... 85
D.2 Maintenance Testing............................................................................................................ 86
D.2.1 Test Point Samples.......................................................................................................... 86
D.2.2 Troubleshooting .............................................................................................................. 87
D.2.3 Converter Faults.............................................................................................................. 87
D.2.4 Converter I/O Modules ................................................................................................... 89
D.3 Spares .................................................................................................................................... 89
INDEX ........................................................................................................................... 91 vi
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
Figures
Figure 1. Front Panel (Model UT-4511 shown) ............................................................................ 2
Figure 2. Rear Panel (shown with RSM Module).......................................................................... 2
Figure 3. Typical Functional Block Diagram (Model DT-4512 shown) ....................................... 3
Figure 4. UT-4511 Dimensional Envelope.................................................................................. 14
Figure 5. Physical Configuration - Down Converter ................................................................... 15
Figure 6. Cable Interconnect Diagram......................................................................................... 23
Figure 7. Non-Redundant Converter Configuration .................................................................... 24
Figure 8. Non-Redundant Converter Configuration With Receive Switch Module ................... 24
Figure 9. Front Panel (Model DT-4511 shown) .......................................................................... 25
Figure 10. Rear Panel (with RSM Module) ................................................................................. 25
Figure 11. Keypad........................................................................................................................ 27
Figure 12. Converter Operating Command Functions................................................................. 28
Figure 13. Configuration Menu Commands - Redundancy OFF. ............................................... 29
Figure 14. Configuration Menu Commands - Redundancy ON, Backup Unit Not Selected ...... 30
Figure 15. Configuration Menu Commands - Redundancy ON and Backup Unit Selected ...... 31
Figure 16. Pre-Select Menu Commands ...................................................................................... 32
Figure 17. Monitor Status Menu Commands............................................................................... 32
Figure 18. Current Faults Menu Commands................................................................................ 33
Figure 19. Stored Faults Menu Commands ................................................................................. 33
Figure 20. Utility Function Menu Commands............................................................................. 34
Figure 21. 1:1 Redundant Configuration .................................................................................... 44
Figure 22. 1:1 Redundant Configuration Diagram ..................................................................... 44
Figure 23. 1:1 Redundant Configuration Diagram ..................................................................... 45
Figure 24. 1:1 Redundant Configuration - Dual Source IF Input ................................................ 46
Figure 25 1:1 Redundant Configuration Diagram .................................................................... 46
Figure 26. Dual Source1:N Redundant Configuration with PSM-XX and RSM-XX Installed .. 47
Figure 27. Dual Source 1:N Redundant ...................................................................................... 48
Figure 28. 1:3 Front Panel Displays ............................................................................................ 49
Figure 29. 1:3 System in AUTO Redundant Mode ..................................................................... 50
Figure 30. Converter #1 Being Backed Up.................................................................................. 51
Figure 31. Converter #1 in MANUAL, Others in AUTO............................................................ 52
Figure 32. Forced BU of Converter #1 ........................................................................................ 53
Figure 33. Typical Converter Functional Block Diagram (Model UT-4512 shown) .................. 83
Figure 34. Converter Signal and Interconnecting Cable Diagra.................................................. 86 vii
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
Tables
Table 1. DT-4503 C-Band Down Converter Specifications.......................................................... 4
Table 2. DT-4503/E C-Band Down Converter Specifications ...................................................... 6
Table 3. DT-4503/X C-Band Down Converter Specifications...................................................... 8
Table 4. DT-451X Ku-Band Down Converter Specifications..................................................... 10
Table 5. DT-4513 and UT-4513/E Ku-Band Down Converter Specifications............................ 12
Table 6. Rear Panel Connectors................................................................................................... 20
Table 7. J1, 2 Wire RS-485 Interface Pin-Out............................................................................. 21
Table 8. J1, 4 Wire RS-485 Interface Pin-Out............................................................................. 21
Table 9. J1, RS-232C Interface Pin-Out ..................................................................................... 21
Table 10. J3, High Speed Bus Connector Pin-Out....................................................................... 22
Table 11. P1, Summary Fault Connector Pin-Out ....................................................................... 22
Table 12. Operating Functions – Front Panel .............................................................................. 26
Table 13. 4500 Series Down Converter Configurations.............................................................. 43
Table 14. Remote Command Summary....................................................................................... 78 viii
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
A
BOUT THIS
M
ANUAL
This manual provides installation and operation information for the Comtech EF Data
DT4500 Series Down Converters. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the DT4500 Series Down Converters.
C
ONVENTIONS AND
R
EFERENCES
C
AUTIONS AND
W
ARNINGS
IMPORTANT
Indicates information critical for proper equipment function.
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.
M
ETRIC
C
ONVERSION
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.
T
RADEMARKS
All product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.
R
EPORTING
C
OMMENTS OR
S
UGGESTIONS
C
ONCERNING THIS
M
ANUAL
Comments and suggestions regarding the content and design of this manual will be appreciated. To submit comments, please contact the Comtech EF Data Customer
Support Department.
EMC C
OMPLIANCE
This is a Class A product. In a domestic environment, it may cause radio interference that requires the user to take adequate protection measures. ix
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
EN55022 C
OMPLIANCE
This equipment meets the radio disturbance characteristic specifications for information technology equipment as defined in EN55022.
EN50082-1 C
OMPLIANCE
This equipment meets the electromagnetic compatibility/generic immunity standard as defined in EN50082-1.
F
EDERAL
C
OMMUNICATIONS
C
OMMISSION
(FCC)
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy. If not installed and used in accordance with the instruction manual, it may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference; in which case, users are required to correct the interference at their own expense.
Note: To ensure compliance, properly shielded cables for DATA I/O shall be used. More specifically, these cables shall be shielded from end to end, ensuring a continuous shield. x
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
S
AFETY
C
OMPLIANCE
EN 60950
Applicable testing is routinely performed as a condition of manufacturing on all units to ensure compliance with safety requirements of EN60950.
This equipment meets the Safety of Information Technology Equipment specification as defined in EN60950.
L
OW
V
OLTAGE
D
IRECTIVE
(LVD)
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:
Symbol Definition Definition
Alternating Current.
Fuse.
Protective Earth.
Chassis Ground.
Note: For additional symbols, refer to “Cautions” listed earlier in this preface. xi
DT4500 Series Down Converters
Preface
MN/DT4500.IOM
Revision 1
W
ARRANTY
P
OLICY
This Comtech EF Data product is warranted against defects in material and workmanship for a period of two years 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.
L
IMITATIONS OF
W
ARRANTY
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.
E
XCLUSIVE
R
EMEDIES
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.
D
ISCLAIMER
Comtech EF Data has reviewed this manual thoroughly to provide an easy-to-use 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 the equipment or the information in this manual, please contact the Comtech EF Data Customer Support Department. xii
Chapter 1. Introduction
DT-4500
Series
Down
Converter
1.1 O
VERVIEW
This manual provides instructions on the installation, operation and maintenance of the
DT-4500 Series Down Converters manufactured by Comtech EF Data Corp.
DT-4503
DT-4503C
DT-4503D
DT-4503E
DT-4510
DT-4510D
DT-4511
DT-4512
DT-4512E
DT-4513
DT-4513E
Individual specifications for each model are included in this section.
1
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
1.2 F
UNCTIONAL
D
ESCRIPTION
The DT-4500 Series Down Converters are designed for use in communication systems, or in satellite downlink data systems, for the transmission of SCPC, DAMA and TDMA communication signals. The Down Converters can also be used in communications system applications with full transponder HDTV and analog TV.
The converter is designed to be hard mounted in a standard 19-inch (48.26 cm) rack or cabinet, or to be rack mounted using slide mechanisms provided with the converter to allow it to be serviced without its removal from the rack. An internally mounted exhaust fan for cooling is mounted on the rear of the chassis. An AC power connector, with an on/off switch, is also located on the rear on the chassis. A six-foot AC power cord is supplied with the converter.
All operator controls, indicators and displays for local and remote operation are located on the front panel of the converter. Connectors for the external interface connections are located on the rear of the converter chassis.
Figure 1. Front Panel (Model DT-4511 shown)
J4 J6 J8 J5
P1 RELAY
J1 COM 1
EXT REF
J2A IN
EXT REF
J2B OUT
J3 HSB IF LP IN LP OUT RF
Figure 2. Rear Panel (shown with RSM Module)
2
DT4500 Series Down Converters
Introduction
RF INPUT
(12200-12750 MHz)
I/O MODULE
MN/DT4500.IOM
Revision 1
IF OUTPUT
(70 or 140 MHz)
MONITOR
&
CONTROL
OSC
CONVERTER
SIGNAL PATH
MODULE
SYNTHESIZER
OSC.
5/10 MHz
REF. OSC.
POWER SUPPLY
Figure 3. Typical Functional Block Diagram (Model DT-4512 shown)
3
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
1.3 S
PECIFICATIONS
Note: Contact CEFD with specific requirements.
Table 1. DT-4503 C-Band Down Converter Specifications
Characteristic
Frequency Range
DT-4503/C
Conversion
Stability Over Time
Stability Over Temp
RF Input
Noise Figure
Level
Impedance
IF Output
Output Level
Range
Intermodulation
Non–carrier Spurious
Carrier Spurious
Return Loss
Impedance
Transfer
Gain
Attenuation Adjust
Gain Stability
Ripple: 70MHz IFCF
140 MHz IFCF
Slope
AM to PM
IF
External Ref.
Specification
3400 to 4200 MHz
Dual, No Inversion
125 kHz standard, 1kHz optional
32 Frequencies
± 1 x 10
-9
/Day
± 1 x 10
-8
0 to 50°C (32 to 122°F)
11 dB Maximum at 0 dB Attenuation
-45 dBm Typical
50
Ω
20 dB Min. with RF/IF connector module
+20 dBm at 1 dB Compression
52 to 88 or 104 to 176 MHz), optional 50 to 80
MHz or 100 to 180 MHz, (see Note)
-60 dBc @ 0 dBm Output SCL
-80 dBm
-65 dBc @ 0 dBm Output
23 dB Minimum
50 or 75
Ω
45 dB ± 2 dB
0 to 20 in 0.25 dB Steps
0.1 dB Steps Optional
± 0.25 dB/Day
± 0.25 dB (± 18 MHz), optional ± 20 MHz,
(see Note)
0.75 dB (± 36 MHz), optional ± 40 MHz,
(see Note)
0.05 dB/MHz
-80 dB Inband
0.1
o
. / dB for Output up to –5 dBm
36 or 72 MHz), optional 40 or 80 MHz,
(see Note)
Input 5 or 10 MHz @ +3 dBm
Optional 10 MHz Rear Panel Reference Output
4
DT4500 Series Down Converters
Introduction
Characteristic
Group Delay
Linear Group Delay
Parabolic Delay
Group Delay Ripple
Phase Noise
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
Remote Control (Rear Panel)
Indicators (Front Panel)
Receive
Remote
Fault
Test Points (Front Panel)
Optional L.O. Sample
Power
Voltage
Frequency
Dissipation
Environmental
Temperature
Altitude
Humidity
Physical
Width
Height
Depth
Weight
MTBF
Summary Alarm
Relay Closure
MN/DT4500.IOM
Revision 1
Specification
0.03 ns/MHz
0.01 ns/MHz
2
1.0 ns Peak-to-Peak
Limit (dBc/Hz)
-80
-89
-95
-105
-120
Typical (dBc/Hz)
-83
-92
-97
-109
-124
Comm Port RS-485 or RS-232
Green LED
Yellow LED
Yellow LED
Yellow LED
Red LED
Red LED
SMA, -20 dBc Nominal
BNC, -20 dBc Nominal
90 to 250 Vac
47 to 63 Hz
60 Watts
-48 Vdc
0 to 50° C (32 to 122° F)
10,000 Feet MSL
0 to 95 % Relative
19 Inches (48.26 cm)
1.75 Inches (4.44 cm)
22 Inches (55.88 cm)
25 Pounds (11.40 kg)
49,740 hrs. (calculated)
>100,000 hrs. (field experience)
Form C
5
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
Table 2. DT-4503/E C-Band Down Converter Specifications
Characteristic
Frequency Range
DT-4503/E
Conversion
Stability Over Time
Stability Over Temp
RF Input
Noise Figure
Level
Impedance
IF Output
Output Level
Range
Transfer
Gain
Intermodulation
Non–carrier Spurious
Carrier Spurious
Return Loss
Impedance
Attenuation Adjust
Gain Stability
Ripple: 70 MHz IFCF
140 MHz IFCF
Slope
AM to PM
IF
External Ref.
Group Delay
Linear Group Delay
Parabolic Delay
Group Delay Ripple
Specification
4500 to 4800 MHz
Dual, No Inversion
125 kHz standard, 1kHz optional
32 Frequencies
± 1 x 10
-9
/Day
± 1 x 10
-8
/Day 0 to 50
°C ( 32 to 122 °F)
11 dB Maximum at 0 dB Attenuation
-45 dBm Typical
50
Ω
20 dB Min. with RF/IF Connector Module
+20 dBm at 1 dB Compression
52 to 88 or 104 to 176 MHz), optional 50 to 80
MHz or 100 to 180 MHz (see Note)
-60 dBc @ 0 dBm Output SCL
-80 dBm
-65 dBc @ +3 dBm Output
23 dB Minimum with RF/IF connector module
50 or 75
Ω
45 dB ± 2 dB
0 to 20 in 0.25 dB Steps
0.1 dB Steps Optional
± 0.25 dB/Day
± 0.25 dB (± 18 MHz), optional ± 20 MHz,
(see Note)
0.75 dB (± 36 MHz), optional ± 40 MHz,
(see Note)
0.05 dB/MHz
-80 dB Inband
0.1
o
./ dB for Output up to –5 dBm
36 or 72 MHz), optional 40 or 80 MHz,
(see Note)
Input 5 or 10 MHz @ +3dBm
Optional 10 MHz Rear Panel Reference Output
0.03 ns/MHz
0.01 ns/MHz
2
1.0 ns Peak-to-Peak
6
DT4500 Series Down Converters
Introduction
Characteristic
Phase Noise
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
Remote Control (Rear Panel)
Indicators (Front Panel)
Receive
Remote
Fault
Test Points (Front Panel)
Power
Optional L.O. Sample
Voltage
Frequency
Dissipation
Environmental
Temperature
Altitude
Humidity
Physical
Width
Height
Depth
Weight
MTBF
Summary Alarm
Relay Closure
MN/DT4500.IOM
Revision 1
Specification
Limit (dBc/Hz)
-80
-89
-95
-105
-120
Typical (dBc/Hz)
-83
-92
-97
-109
-124
Comm Port RS-485 or RS-232
Green LED
Yellow LED
Yellow LED
Yellow LED
Red LED
Red LED
SMA, -20 dBc Nominal
BNC, -20 dBc Nominal
90 to 250 Vac, Autoranging, optional –48 VDC
47 to 63 Hz
60 Watts
-48 Vdc
0 to 50°C (32 to 122° F)
10,000 Feet MSL
0 to 95 % Relative
19 Inches (48.26 cm)
1.75 Inches (4.44 cm)
22 Inches (55.88 cm)
15 Pounds (7.00 kg)
49,740 hrs. (calculated)
>100,000 hrs. (field experience)
Form C
7
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
RF Input
Noise Figure
Level
Impedance
IF Output
Output Level
Range
Table 3. DT-4503/X C-Band Down Converter Specifications
Characteristic
Frequency Range
DT-4503
DT-4503/D
DT-4503/E
Conversion
Stability Over Time
Stability Over Temp
Intermodulation
AM to PM
IF
Non–carrier Spurious
Carrier Spurious
Impedance
Transfer
Gain
Attenuation Adjust
Gain Stability
Ripple: 70 MHz IFCF
140 MHz IFCF
Slope
Specification
3625 to 4200 MHz
3400 to 3700 MHz
Refer to Table 2.
Dual, No Inversion
125 kHz standard, 1kHz optional
32 Frequencies and Gains
± 1 x 10
-9
± 1 x 10
-8
/Day
0 to 50°C (32 to 122 o
F)
11 dB Maximum at 0 dB Attenuation
-45 dBm Typical
50
Ω
20 dB Min. with RF/IF Connector Module
+20 dBm at 1 dB Compression
52 to 88 or 104 to 176 MHz), optional 50 to 80
MHz or 100 to 180 MHz, (see Note)
-60 dBc @ 0 dBm Output SCL
-80 dBm
-65 dBc @ +3 dBm Output
50 or 75
Ω
23 dB Min. with RF/IF connector module or SW Module
45 dB ± 2 dB
0 to 20 in 0.25 dB Steps
0.1 dB Steps Optional
± 0.25 dB/Day
± 0.25 dB (± 18 MHz), optional ± 20 MHz,
0.75 dB (± 36 MHz), optional ± 40 MHz, (see
Note) 10.05 dB/MHz
0.05 dB/MHz
-80 dB Inband
0.1
o
./ dB for Output up to –5 dBm
36 or 72 MHz), optional 40 or 80 MHz,
External Ref.
Input 5 or 10 MHz @ +3dBm
Optional 10 MHz Rear Panel Reference Output
8
DT4500 Series Down Converters
Introduction
Characteristic
Group Delay
Linear Group Delay
Parabolic Delay
Group Delay Ripple
Phase Noise
100 Hz
1 KHz
10 KHz
100 KHz
1 MHz
Remote Control (Rear Panel)
Indicators (Front Panel)
Mute
Remote
Fault
Test Points (Front Panel)
Optional L.O. Sample
Power
Voltage
Frequency
Dissipation
Environmental
Temperature
Altitude
Humidity
Physical
Width
Height
Depth
Weight
MTBF
Summary Alarm
Relay Closure
MN/DT4500.IOM
Revision 1
Specification
0.03 ns/MHz
0.01 ns/MHz
2
1.0 ns Peak-to-Peak
Limit (dBc/Hz)
-80
-89
-95
-105
-120
Typical (dBc/Hz)
-83
-92
-97
-109
-124
Comm Port RS-485 or RS-232
Green LED
Yellow LED
Yellow LED
Yellow LED
Red LED
Red LED
SMA, -20 dBc Nominal
BNC, -20 dBc Nominal
90 to 250 Vac Autoranging
47 to 63 Hz
60 Watts
-48 Vdc
0 to 50° C (32 to 122° F)
10,000 Feet MSL
0 to 95 % Relative
19 Inches (48.26 cm)
1.75 Inches (4.44 cm)
22 Inches (55.88 cm)
15 Pounds (7.00 kg)
49,740 hrs. (calculated)
>100,000 hrs. (field experience)
Form C
9
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
Characteristic
Frequency Range
DT-4510
DT-4510/D
DT-4511
DT-4512
DT-4512/E
Conversion
Stability Over Time
Stability Over Temp
RF Input
Table 4. DT-451X Ku-Band Down Converter Specifications
Level
Return Loss
Impedance
Noise
IF Output
Level
Range
Intermodulation
Non–carrier Spurious
Carrier Spurious
Impedance
Transfer
Gain
Attenuation Adjust
Gain Stability
AM to PM
External Ref.
Ripple: 70 MHz IFCF
140 MHz IFCF
Slope
Specification
10.95 to 11.70 GHz
10.70 to 11.70 GHz
11.70 to 12.20 GHz
12.20 to 12.75 GHz
12.50 to 12.80 GHz
Dual, No Inversion
125 kHz standard, 1kHz optional
32 Frequencies and Gains
± 1 x 10
-9
/Day
± 1 x 10
-8
0 to 50°C (32 to 122 o
F)
-45 dBm Typical
20 dB Min. with IO Module
50
Ω
11 dB Maximum at 0 dB Attenuation
+20 dBm at 1 dB Compression
52 to 88 or 104 to 176 MHz
-60 dBc @ 0 dBm Output SCL
-80 dBm
-65 dBc @ 0 dBm Output
50 or 75
Ω
23 dB Min. with IO Module
45 dB ± 2 dB
0 to 20 in 0.25 dB Steps
0.1 dB Steps Optional
± 0.25 dB/Day
± 0.25 dB (± 18 MHz)
0.75 dB (± 36 MHz)
0.05 dB/MHz
-80 dB Inband
0.1
o
./ dB for Output up to –5 dBm
Input 5 or 10 MHz @ +3dBm
Optional 10 MHz Rear Panel Reference Output
10
DT4500 Series Down Converters
Introduction
Characteristic
Group Delay
Linear Group Delay
Parabolic Delay
Group Delay Ripple
Phase Noise
100 Hz
1 KHz
10 KHz
100 KHz
1 MHz
Remote Control (Rear Panel)
Indicators (Front Panel)
Mute
Remote
Fault
Test Points (Front Panel)
Optional L.O. Sample
Power
Voltage
Frequency
Dissipation
Environmental
Temperature
Altitude
Humidity
Physical
Width
Height
Depth
Weight
MTBF
Summary Alarm
Relay Closure
MN/DT4500.IOM
Revision 1
Specification
0.03 ns/MHz
0.01 ns/MHz
2
1.0 ns Peak-to-Peak
Limit (dBc/Hz)
-72
-79
-89
-98
-110
Typical (dBc/Hz)
-79
-82
-92
-101
-114
Comm Port RS-485 or RS-232
Green LED
Yellow LED
Yellow LED
Yellow LED
Red LED
Red LED
SMA, -20 dBc Nominal
BNC, -20 dBc Nominal
90 to 250 Vac Autoranging
47 to 63 Hz
60 Watts
-48 Vdc
0 to 50° C (32 to 122° F)
10,000 Feet MSL
0 to 95 % Relative
19 Inches (48.26 cm)
1.75 Inches (4.44 cm)
22 Inches (55.88 cm)
15 Pounds (7.00 kg)
49,740 hrs. (calculated)
>100,000 hrs. (field experience)
Form C
11
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
Table 5. DT-4513/E Ku-Band Down Converter Specifications
Characteristic
Frequency Range
DT-4513
DT-4513/E
Conversion
Stability Over Time
Stability Over Temp
RF Input
Level
Return Loss
Impedance
Noise
IF Output
Level
Range
Intermodulation
Non–carrier Spurious
Carrier Spurious
Impedance
Transfer
Gain
Attenuation Adjust
Gain Stability
Ripple: 70 MHz IFCF
140 MHz IFCF
Slope
AM to PM
External Ref.
Group Delay
Linear Group Delay
Parabolic Delay
Group Delay Ripple
Specification
10.95 to 12.75 GHz
10.70 to 12.75 GHz
Dual, No Inversion
125 kHz standard, 1kHz optional
32 Frequencies
± 1 x 10
-9
/Day
± 1 x 10
-8
0 to 50°C (32 to 122 o
F)
-45 dBm Typical
20 dB Min. with RF/IF Connector Module
50
Ω
11 dB Maximum at 0 dB Attenuation
+20 dBm at 1 dB Compression
52 to 88 or 104 to 176 MHz
-60 dBc @ 0 dBm Output SCL
-80 dBm
-65 dBc @ 0 dBm Output
50 or 75
Ω
23 dB Min. with IO Module
45 dB ± 2 dB
0 to 20 in 0.25 dB Steps
0.1 dB Steps Optional
± 0.25 dB/Day
± 0.25 dB (± 18 MHz)
0.75 dB (± 36 MHz)
0.05 dB/MHz
-80 dB Inband
0.1
o
./ dB for Output up to –5 dBm
Input 5 or 10 MHz @ +3dBm
Optional 10 MHz Rear Panel Reference Output
0.03 ns/MHz
0.01 ns/MHz
2
1.0 ns Peak-to-Peak
12
DT4500 Series Down Converters
Introduction
Characteristic
Phase Noise
100 Hz
1 KHz
10 KHz
100 KHz
1 MHz
Remote Control (Rear Panel)
Indicators (Front Panel)
Receive
Remote
Fault
Test Points (Front Panel)
Optional L.O. Sample
Power
Voltage
Frequency
Dissipation
Environmental
Temperature
Altitude
Humidity
Physical
Width
Height
Depth
Weight
MTBF
Summary Alarm
Relay Closure
MN/DT4500.IOM
Revision 1
Specification
Limit (dBc/Hz)
-66
-76
-86
-96
-106
Typical (dBc/Hz)
-69
-79
-89
-99
-109
Comm Port RS-485 or RS-232
Green LED
Yellow LED
Yellow LED
Yellow LED
Red LED
Red LED
SMA, -20 dBc Nominal
BNC, -20 dBc Nominal
90 to 250 Vac Autoranging
47 to 63 Hz
60 Watts
-48 Vdc
0 to 50° C (32 to 122° F)
10,000 Feet MSL
0 to 95 % Relative
19 Inches (48.26 cm)
1.75 Inches (4.44 cm)
22 Inches (55.88 cm)
15 Pounds (7.00 kg)
49,740 hrs. (calculated)
>100,000 hrs. (field experience)
Form C
13
DT4500 Series Down Converters
Introduction
1.3.1 D
IMENSIONAL
E
NVELOPE
(DT-4500)
Dimensions are shown in both inches and centimeters.
17.00
(432)
MN/DT4500.IOM
Revision 1
22.00
(55.9)
1.75”
(4.45)
SAMPLE
RF IF
POWER ON
TRANSMIT
REMOTE
STATUS
ON LINE
FAULT
STORED FAULT
18.25
(46.35)
19.0
(48.3)
Figure 4. Dimensional Envelope
14
ENT
CLR
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
1.4 P
HYSICAL
C
ONFIGURATION
Figure 5 is a top view layout of a DT-4500 Series Down Converter chassis with the cover removed. Major chassis components are shown in Figure 5. The major module assemblies shown in the layout are:
Signal Path Module
Step Loop Module
Monitor & Control Assembly
Transmit I/O Switch Module
Reference Oscillator Assembly
Sum Loop Module
Power Supply Assembly
Monitor
& Control
Board
Switch
Module
Signal
Path
Sum Module
Power Supply
Reference
Oscillator
Filter
Module
Step
Module
Figure 5. Physical Configuration - Down Converter
15
DT4500 Series Down Converters
Introduction
MN/DT4500.IOM
Revision 1
1.5 F
RONT
P
ANEL
D
ISPLAY
The front panel display is a two line, 24-character, LCD display. Each configuration function, or operating mode, is shown on the display when the operator enters a command into the keypad on the front panel.
1.6 F
RONT
P
ANEL
T
EST
P
OINT
S
AMPLES
Two test point connections are located on the front panel for monitoring the RF input and the IF output. An SMA connector is provided for the RF input, and a BNC connector is provided for the IF output. There is also an optional RF LO monitor available that replaces the RF monitor.
1.7 P
RIME
P
OWER
S
WITCH
The on/off prime power switch is located on the rear of the chassis adjacent to the prime power input connector. The power switch contains a filter and dual fuse. The dual fuse is rated for 2 Amps.
1.8 N
EW IN THIS
M
ANUAL
Incorporated Errata’s A though E
Incorporated new figure for TSEQM Connector Locations.
16
DT4500 Series Down Converters
Introduction
NOTES:
17
MN/DT4500.IOM
Revision 1
Chapter 2. Installation
2.1 U
NPACKING AND
I
NSPECTION
Inspect the shipping container for damage. If the shipping containers are damaged, keep them until the contents of the shipment have been carefully inspected and checked for normal operation.
Remove the packing list from the outside of the shipping carton. Open the carton and remove the contents, checking the contents against the packing list. Verify completeness of the shipment and that the unit functions correctly. If damage is evident, contact the carrier and Comtech EF Data immediately and submit a damage report.
If the unit needs to be returned to Comtech EF Data, please use the original shipping container.
2.2 R
ACK
M
OUNT
I
NSTALLATION
The DT-4500 Series Down Converters are designed for installation in a standard 19 inch rack cabinet or enclosure. The converter chassis requires 1-3/4 inches of panel height space. Adequate air ventilation should be provided on both sides of the rack-mounted equipment.
If the converter is to be mounted on slides, the slides must be the Comtech EF Data rack slides provided with the converter. Mount the slides on the sides of the converter chassis with the mounting hardware provided. Then, install the slide rails in the rack cabinet enclosure.
Slide the converter into the front of the rack cabinet until the rear of the front panel contacts the mounting surface of the cabinet. Secure the converter to the rack cabinet with four screws inserted through the converter’s front panel slotted holes.
2.3 P
RIME
P
OWER
C
ONNECTION
The detachable power cord mates with the AC Prime power receptacle on the rear of the converter chassis. A power cord for connection to 90 to 125 Vac, or 205 to 240 Vac, power sources is provided with the converter.
19
DT4500 Series Down Converters
Installation
MN/DT4500.IOM
Revision 1
2.4 C
ABLE
C
ONNECTIONS
Connect the signal cables to the connectors on the rear panel as shown in Figure 6. The cable signal functions are listed in Table 6.
2.4.1 R
EAR
P
ANEL
C
ONNECTIONS
Table 6. Rear Panel Connectors
Connector Description
Prime Power AC Prime Power Input (AC POWER), Optional –48 Vdc
J1: Serial Communications Interface for RS-485 or RS-232 COMM links (COM 1).
J2:
J3:
J4:
External Reference Oscillator Input
High Speed Bus (HSB)
Converter IF Input (IF).
J5:
J6:
J7:
J8:
J9:
P1:
Converter RF Output (RF).
IF TSM Switching Loop Input (LP IN).
RF TSM Switching Loop Input (LP IN).
IF TSM Switching Loop Output (LP OUT).
RF TSM Switching Loop Output (LP OUT).
Summary Fault Output (RELAY).
20
DT4500 Series Down Converters
Installation
MN/DT4500.IOM
Revision 1
2.4.2 RS-485/RS-232C I
NTERFACE
(COM 1), C
ONNECTOR
J1
The RS-485/RS-232C Interface connector, J1, is 9 pin "D" type DB9F connector socket.
The pin-out specifications for RS-485 are contained in Table 7 and Table 8. The specification for RS-232 is contained in Table 9. The mating connector is a DB9M.
Table 7. J1, 2 Wire RS-485 Interface Pin-Out Table 8. J1, 4 Wire RS-485 Interface Pin-Out
Pin # Description Pin # Description
2
3
2
3
5 -RX/TX; Signal Complement
6
7
9 -RX/TX; Signal Complement
Note: Pins 8 & 9 are the loop to the next converter.
5 -TX; Signal Complement
6
7
9 -RX; Signal Complement
Table 9. J1, RS-232C Interface Pin-Out
Pin # Description
1
3 RD; Receive Data
4
6 DSR; Unit Ready - always high.
7
8
RTS; Request to Send. Looped to CTS.
CTS; Clear to Send
9
21
DT4500 Series Down Converters
Installation
MN/DT4500.IOM
Revision 1
2.4.3 H
IGH
S
PEED
B
US
(HSB), C
ONNECTOR
J3
The High Speed Bus connector, J3, is 25-pin "D" type DB25F connector socket. The pin-out specifications are contained in Table 10. The mating connector is a DB25M.
Note: This is not a “straight through” cable assembly. Contact Comtech EF Data for detailed wire drawings when cabling between converters.
Table 10. J3, High Speed Bus Connector Pin-Out
Pin # Description Pin # Description Pin # Description
13 21 +14V
2.4.4 S
UMMARY
F
AULT
O
UTPUT
(RELAY), C
ONNECTOR
P1
The summary fault output connector, P1, is 9-pin "D" type DB9F connector. The pin-out specifications are contained in Table 11. The mating connector is a DB9M.
Table 11. P1, Summary Fault Connector Pin-Out
Pin # Description
1 Summary Fault NC
2 Summary Fault NO
3
4
5 Ground
6 Summary Fault Com
7 External Fault Input
8
9
Notes:
1
Pin 1 to Pin 6: Fault.
2
3
Pin 2 to Pin 6: No Fault.
Pin 7 to Pin 5: Forced Fault. Typically used with external group delay equalizers
22
DT4500 Series Down Converters
Installation
MN/DT4500.IOM
Revision 1
Prime Power Cord Input
5/10 MHz Ref. Osc. Input J2
Summary Fault Relay Output P1
Serial Comm. Interface
(EIA-485 / EIA-232C)- COM 1
J1
High Speed Bus (HSB) J3
Power
Supply
Reference
Oscillator
Monitor & Control Assembly
Fine
Step
Module
IF Output (IF)
IF Loop Input (LP IN)
IF Loop Output (LP OUT)
RF Input (RF)
(Not Used)
(Not Used)
J4
J6
J8
J5
J7
J9
Receive
I/O Switch
Module
RF Converter
Sum
Loop
Module
Figure 6. Cable Interconnect Diagram
2.4.5 C
ABLE
C
ONNECTIONS
F
OR
N
ON
-R
EDUNDANT
S
YSTEM
O
PERATION
In non-redundant converter configuration the converter has an Input/Output Module
(IOM-XX) for the RF input and the IF Output. A converter with a Transmit or Receive
Switch Module may be operated in a non-redundant configuration if an IOM is unavailable. Figure 7 is an illustration of the converter cable connections with an IOM installed. Figure 8 is an illustration of the converter cable connections with a TSM installed.
2.4.6 C
ABLE
C
ONNECTIONS
F
OR
R
EDUNDANT
S
YSTEM
O
PERATION
In subsystems where a redundant converter configuration is used, the backup Converter has an Input/Output Module (IOM-XX) and the online converters have Receive Switch
Modules (TSM-XX), which switch to the backup Converter when a fault is detected.
Redundant system operation is discussed in Appendix A, Redundant System Operation.
23
DT4500 Series Down Converters
Installation
IOM-XX
J4
J3 HSB IF
J5
RF
NO
CONNECTION
IF
OUTPUT
RF
INPUT
Figure 7. Non-Redundant Converter Configuration
RSM-XX
J4 J6 J8 J5
J3 HSB IF LP IN LP OUT RF
MN/DT4500.IOM
Revision 1
NO
CONNECTION
IF OUTPUT RF INPUT
DOWN CONVERTER - RSM
IF OUTPUT
RF INPUT
Figure 8. Non-Redundant Converter Configuration With Receive Switch Module (RSM-XX) Installed
24
Chapter 3. System Operation
3.1 O
VERVIEW
This chapter contains instructions for operating the converter. Illustrations of the front and rear panels are provided showing the keypad for operator input commands, LCD
Display, LED status indicators, and the connectors. Tables are provided to show the control and operating functions of the converter.
The front and rear panels are shown below. Table 12 lists of the operating functions for the keypad, LCD display, LED indicators and test sample connections on the front panel.
Figure 9. Front Panel (Model DT-4511 shown)
J4 J6 J8 J5
EXT REF
J2A IN
EXT REF
J2B OUT
P1 RELAY
J1 COM 1
J3 HSB IF LP IN LP OUT RF
Figure 10. Rear Panel (with RSM Module)
25
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
Table 12. Operating Functions – Front Panel
Item Reference Designation
Enter key
Functional Description
Enters commands into the converter.
ENT
CLR
Clear key Clears commands and data selected and not entered.
Right Arrow key Selects functions and the menu operating data.
Left Arrow key Selects functions and the menu operating data.
Up Arrow key Selects the operating menu and data values.
Down Arrow key Selects the operating menu and data values.
DT_4511-1
SW VER 4.06 SN45113513
Indicator
POWER ON
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
Item
RF SAMPLE
IF SAMPLE
Color
Green
Yellow
Yellow
Yellow
Red
Red
Reference
Designation
RF
IF
LCD Display Displays commands and data entered into the keypad.
Function
Prime power is applied when the light is on.
Transmit function operating when the light is on.
In Remote Control Mode when the light is on.
Operating on-line to transmit data when the light is on.
Fault condition exists when the light is on.
Faults stored and logged when the light is on.
Function
An SMA connector test point to sample RF.
A BNC connector test point to sample IF.
26
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.2 S
WITCHING
P
OWER
ON
Before turning the Prime Power Switch to the ON position, check to ensure that the installation is complete, and verify that the converter is connected to the proper prime power source, RF Input and IF Output.
Switch the ON/OFF Prime Power Switch on the rear panel to ON. Verify that the cooling fan is operating, and that the POWER ON LED STATUS indicator light is on.
After the AC power is switched on and before pressing the buttons on the keypad, the
LCD display message should be similar to:
DT-4512-X
SW VER 2.08 SN4513XXXX
3.3 O
PERATION
Local operation of the RF Down Converter is controlled by operator input commands initiated through the six-button keypad on the front panel shown in Figure 11. The keypad is the local operator's interface to control, configure and monitor the status of the converter. Operator inputs and commands entered into the keypad are displayed by the front panel 24-character, two line, LCD display. See Appendix B for Remote Control.
There are six operating command functions: Configuration, Pre-Select, Monitor Status,
Currents Faults, Stored Faults and Utility Functions. A flow-chart for selecting the commands, operating menus, and data inputs is shown in Figure 12 through Figure 20.
ENT
CLR
Figure 11. Keypad
27
DT4500 Series Down Converters
System Operation
--------DT-4513--------
-SOFTWARE VERSION-1.00-
---------SELECT---------
----CONFIGURATION-MENU--
---------SELECT---------
MN/DT4500.IOM
Revision 1
---------SELECT---------
--MONITOR-STATUS-MENU---
---------SELECT---------
--CURRENT-FAULTS-MENU---
---------SELECT---------
---STORED-FAULTS-MENU---
LEGEND
KEY-PAD
ENT
---------SELECT---------
-UTILITY-FUNCTIONS-MENU-
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 12. Converter Operating Command Functions
28
DT4500 Series Down Converters
System Operation
---------SELECT---------
----CONFIGURATION-MENU--
ENTER
FREQ= 12XXX.XXX-MHz-----
ATTN=-10.00-DB---Rx=OFF-
----EXTERNAL-5-MHz------
--REFERENCE-PRESENT-----
* Displayed only when there is
a 5/10 MHz reference input.
--ENTRY-MODE-=-REMOTE---
-COLD-START-=-DISABLED--
MN/DT4500.IOM
Revision 1
FAULT RECOVERY:-MANUAL--
------------------------
LEGEND KEY-PAD
ENT
REDUNDANCY-CONFIG?-OFF--
------------------------
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 13. Configuration Menu Commands - Redundancy OFF.
29
DT4500 Series Down Converters
System Operation
---------SELECT---------
----CONFIGURATION-MENU--
ENTER
FREQ= 12XXX.XXX-MHz-----
ATTN=-10.00-DB---Rx=OFF-
** Manual when “Redundancy
Config ON” and not in “BU”
----EXTERNAL-5-MHz------
--REFERENCE-PRESENT-----
* Displayed only when there is
a 5/10 MHz reference input.
--ENTRY-MODE-=-REMOTE---
-COLD-START-=-DISABLED--
MN/DT4500.IOM
Revision 1
FAULT RECOVERY:-MANUAL--
------------------------
REDUNDANCY-CONFIG?-OFF--
------------------------
ENT + DOWN + ENT
CLR
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-XX---------
LEGEND KEY-PAD
ENT
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 14. Configuration Menu Commands - Redundancy ON, Backup Unit Not Selected
30
DT4500 Series Down Converters
System Operation
---------SELECT---------
----CONFIGURATION-MENU--
ENTER
FREQ= 12XXX.XXX-MHz-----
ATTN=-10.00-DB---Rx=OFF-
----EXTERNAL-5-MHz------
--REFERENCE-PRESENT-----
* Displayed only
when there is
a 5/10 MHz
reference input.
--ENTRY-MODE-=-REMOTE---
-COLD-START-=-DISABLED--
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-01---------
ENT + RIGHT+UP . . . +UP + ENT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-BU---1:03--
FAULT RECOVERY:-MANUAL--
------------------------
-CONVERTER-123456789ABC-
-AUTO/MAN--AAM----------
REDUNDANCY-CONFIG?-OFF--
------------------------
ENT + DOWN + ENT
ENT + UP + ENT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-XX---------
ENT + RIGHT+UP + ENT
CONV-01-OFFSET=+00.00-DB
--ACTIVATE-BACKUP:-NO---
-CONV-#03-FRQ=XXXXX.XXX-
-ATEN=10.00---MANUAL-OK-
LEGEND KEY-PAD
ENT
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 15. Configuration Menu Commands -
Redundancy ON and Backup Unit Selected
MN/DT4500.IOM
Revision 1
31
DT4500 Series Down Converters
System Operation
---------SELECT---------
-----PRE-SELECT-MENU----
ENTER
-DISPLAY-PRE-SELECT-XX--
XXXXX.XXX-MHz--XX.XX--DB
-CONFIGURE-CONVERTER-TO-
-----PRE-SELECT?-XX-----
-PROGRAM-PRE-SELECT-XX--
XXXX.XXX-MHZ---XX.XX-DB-
LEGEND KEY-PAD
ENT
----CLEAR-DATA-FROM-----
-----PRE-SELECT?-XX-----
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 16. Pre-Select Menu Commands
---------SELECT---------
---MONITOR-STATUS-MENU--
ENTER
15VDC=-15.6--14VDC=-14.0
-VCC-=5.0---5VDis-=-4.0-
--CONVERTER-TEMP-=-+50C-
--IFLO-TUNING-=-X.X-V---
LEGEND
KEY-PAD
ENT
SYNTH.-TUNING-=-X.X-V---
--COARSE=X.XX-FINE=X.XX-
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 17. Monitor Status Menu Commands
MN/DT4500.IOM
Revision 1
32
DT4500 Series Down Converters
System Operation
---------SELECT---------
---CURRENT-FAULTS-MENU--
ENTER
------POWER-FAULTS------
15VDC=OK-14VDC-OK-VCC=OK
-INFO-LOCK-DETECT-=-OK--
REFERENCE-LOCK-DET-=-OK-
SYNTH-FAULTS:-SUM-LD=OK-
FINE-LD=OK--COARSE-LD=OK
LEGEND
KEY-PAD
ENT
-CONV-TEMPERATURE-=-OK--
--HIGH-SPEED-BUS-=-OK---
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 18. Current Faults Menu Commands
MN/DT4500.IOM
Revision 1
---------SELECT---------
---STORED-FAULTS-MENU---
ENTER
LEGEND KEY-PAD
ENT
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
TOTAL-FAULTS-STORED:--XX
LAST-19:20:05---05/19/02
----CLEAR-ALL-STORED----
-------FAULTS?-NO-------
ENT + UP to scroll thru
Stored Faults
ST-FAULT-XX-----19:20:05
OK-FINE-LOCK----05/19/02
CLR to return
Figure 19. Stored Faults Menu Commands
33
DT4500 Series Down Converters
System Operation
---------SELECT---------
-UTILITY-FUNCTIONS-MENU-
ENTER
----TIME:-10:22:05AM----
-----DATE:-05/19/02-----
---SERIAL-MODE=EIA232C--
ADDR=XXX-BAUD=YYYY-P=ZZ-
-DISPLAY-CONTRAST-=-XX--
DISPLAY-BRIGHTNESS-=-XX-
--REFERENCE-FREQUENCY---
----ADJUSTMENT-=-XXX----
---CONVERTER-SLOPE------
----ADJUSTMENT-=-X.X----
LEGEND
KEY-PAD
ENT
-------LAMP-TEST--------
-----------OFF----------
CLR
DISPLAY
---------SELECT---------
--MONITOR-STATUS-MENU---
Figure 20. Utility Function Menu Commands
MN/DT4500.IOM
Revision 1
34
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.3.1 C
ONVERTER
C
OMMANDS
The converter commands are in a tree structured menu format designed for access and execution of all control functions, and to prevent the execution of an invalid entry by the operator. When the prime power is turned on, the LCD display will contain a message indicating the converter model number and the version number of the firmware installed in the converter.
To select a Command Function press the "ENT" button on the keypad. The LCD display will indicate:
SELECT
CONFIGURATION MENU
This will provide the local operator access to the Command Function Menus, which is the top-level structure to start the selection of Command Function Menus to input into the converter. To sequence to the next Command Function Menu press a "DOWN" or "UP" arrow button on the keypad. The converter will step to the next Command Function
Menu each time a "DOWN" or "UP" arrow button is pressed. The current Command
Function Menu will be displayed on the LCD display. The Command Function Menus are shown in Figure 12.
To select a specific Command Function Menu press the "ENT" keypad button. If a function is selected in error, press the clear ("CLR") button, which will return the converter to the main command menus to allow the selection of another function. Any one of the six Command Function Menus can be selected using this procedure.
Once a Command Function has been selected, use the "RIGHT" or "LEFT" arrow keypad buttons to sequence through the Operating Mode Commands. Each of the modes will be displayed on the LCD display. A specific operating mode is selected by pressing the
"ENT" button. If an mode is selected in error, press the clear ("CLR") button, which will return the converter to the operating menus to allow the selection of another mode.
When an operating mode is selected, a parameter or a digit within the parameter will be flashing on the LCD display. Use the "RIGHT" and "LEFT" arrows buttons to sequence through the parameters or digits to select the next parameter or digit. A specific parameter or value is selected by pressing the "ENT" button. If a parameter or value is selected in error, press the clear ("CLR") button, which will return the converter to the original parameter or value to allow another selection.
After selecting a parameter or digit, use the "UP" or "DOWN" arrow buttons to select the next parameter, or to increment or decrement the value of a digit. A specific new parameter or new value is selected by pressing the "ENT" button. If a parameter or value is selected in error, press the clear ("CLR") button, which will return the converter to the original parameter or value to allow another selection.
Each time the clear ("CLR") button is pressed, the converter will return to the menu level prior to the last "ENT" command.
35
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.3.2 C
ONFIGURATION
F
UNCTIONS
M
ENU
The Configuration Functions are as follows:
3.3.2.1 F
REQUENCY
O
PERATING
M
ODE
Frequency (FREQ):
Displays the current converter frequency in MHz, and allows the selection of a new frequency channel between RF
Low
to RF
High
MHz (e.g.; 10950.000 to
12750.000 MHz for Model DT-4513) in 125 KHz steps through keypad inputs.
Attenuation (ATTN):
Input and displays the converter attenuation setting which is selected between
0.00 to 20.00 in 0.25 dB steps. The default setting is 10.00 dB.
Rx:
The converter is ON or OFF. The default mode is OFF.
3.3.2.2 E
XTERNAL
R
EFERENCE
External Reference:
The External Reference is displayed only when the 5 or 10 MHz external reference input to the converter is present.
3.3.2.3 E
NTRY
M
ODE
/COLD S
TART
The entry mode is Local or Remote. The default is Remote.
COLD Start:
The COLD Start Mode, if enabled, mutes the converter output signal for a predetermined time, 15 minutes, after power is applied to the converter to ensure that the reference oscillator is stable. The default mode is Disabled. This function is disabled in redundant systems.
3.3.2.4 F
AULT
R
ECOVERY
Fault Recovery:
Fault Recovery is Manual or Auto. The default is Auto.
3.3.2.5 R
EDUNDANCY
M
ODE
Refer to Appendix A, Redundant System Operation.
3.3.3 P
RE
-
SELECT
F
UNCTION
M
ENU
3.3.3.1 D
ISPLAY
P
RE
-S
ELECT
Displays the frequency and attenuation pre-selects for the converter. One (1) to thirtytwo (32) frequencies can be pre-selected. If no frequencies have been pre-selected, the
LCD display will indicate "NONE".
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DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.3.3.2 C
ONFIGURE
C
ONVERTER
T
O
P
RE
-S
ELECT
This command allows the local operator to pre-select from one (1) to thirty-two (32) frequencies to pre-set a programmed frequency channel and attenuation setting.
3.3.3.3 C
LEAR
D
ATA
F
ROM
P
RE
-S
ELECT
This command allows the local operator to clear a pre-set frequency and attenuation setting from a pre-selected converter.
3.3.3.4 P
ROGRAM
P
RE
-S
ELECT
This command allows the local operator to input a pre-set frequency channel and attenuation settings into a converter.
3.3.4 M
ONITOR
S
TATUS
F
UNCTION
M
ENU
Monitors and displays the status of:
15 and 14 Vdc power supplies.
Converter internal temperature.
IFLO tuning voltage level.
Synthesizer Sum., Coarse and Fine Loop tuning.
3.3.5 C
URRENT
F
AULTS
F
UNCTION
M
ENU
Displays the status of the current fault conditions. The LCD display will indicate "FT" when a fault condition exists. The display will indicate "OK" when a fault has not occurred.
3.3.5.1 P
OWER
F
AULTS
Displays the DC voltage power supply faults.
15 Vdc Power Supply.
14 Vdc Power Supply.
VCC voltage.
3.3.5.2 C
ONVERTER
O
SCILLATOR
F
AULTS
Displays the converter oscillator faults:
IFLO Lock Detect.
Reference Oscillator Lock Detect (only present if external reference is detected.).
37
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.3.5.3 S
YNTHESIZER
F
AULTS
Displays the synthesizer faults:
Sum Loop Detect.
Coarse Loop Detect.
Fine Loop Detect.
3.3.5.4 C
ONVERTER
O
VER
T
EMPERATURE
F
AULT
Displays a converter temperature fault condition.
3.3.6 S
TORED
F
AULTS
The converter displays a total of one hundred (100) faults, which are date and time stamped and stored in memory as they occur. The stored faults remain in memory until a clear command is entered. When the number of faults reaches 100, the 100 th
fault will display ER.
3.3.6.1 T
OTAL
S
TORED
F
AULTS
Displays the total number of faults stored. The most recent fault stored is displayed on the LCD display.
3.3.6.2 C
LEAR
A
LL
S
TORED
F
AULTS
Input command to clear all faults. The command is "YES" or "NO' which is displayed on the LCD display.
3.3.6.3 D
ISPLAY
S
TORED
F
AULT
The local operator can sequence through the stored faults starting with the most recent fault. The fault number, time, description and date are displayed on the LCD display.
38
DT4500 Series Down Converters
System Operation
MN/DT4500.IOM
Revision 1
3.3.7 U
TILITY
F
UNCTION
M
ENU
The local operator can input commands to the following Utility Functions, which are displayed on the LCD display:
TIME. Military time is used in hours, minutes and seconds.
DATE. The date is displayed in month, day and year.
Serial MODE (communications link).
RS-485 or RS-232.
Physical Address. The default address starts from one (001).
BAUD (Rate). The default baud rate is 9600.
PARITY. Even, Odd or None.
Display Controls.
DISPLAY CONTRAST. The default is 15, with values from 0 - 30.
DISPLAY BRIGHTNESS. The default is 15, with values from 0 - 30.
REF Adjust.
REFERENCE FREQUENCY ADJUSTMENT. The default tuning adjustment is 87, with values from 0 – 255
39
DT4500 Series Down Converters
System Operation
NOTES:
40
MN/DT4500.IOM
Revision 1
Appendix A.
Redundant System Operation
Overview 41
Backup Converter 42
Redundant Configurations 43
A.1 O
VERVIEW
The Comtech EF Data DT-4500 Series Down Converters are configured for redundant system operation using distributed protection switching in an active "Daisy Chain" configuration. Comtech EF Data's Proprietary "Daisy Chain" configuration distributes the converter protection switching functions in the converters.
This provides a system capability to backup from 1 to 12 online converters. A High
Speed Bus (HSB) provides the communications interface between the backup and online converters to detect faults and reconfigure the subsystem to replace the failed converter.
When a faulted converter is removed from active operation, it is detached from the active converter chain by separating the converter from its switch module, leaving the active online converter chain intact through the switch module. The chain can be extended without affecting the online converter operation.
The active "chained" converters in a redundancy subsystem can also be indirectly controlled through the backup Converter using the remote serial communication link - this capability is discussed in Appendix B, Remote Control.
41
DT4500 Series Down Converters
Redundant System Operation
MN/DT4500.IOM
Revision 1
A.2 B
ACKUP
C
ONVERTER
The "Daisy Chain" terminates in the backup Converter. The backup Converter has a microprocessor, which performs fault detection, self-reconfiguration and the logical switching functions. If the backup Converter does not have a fault, it will assume the frequency and attenuation of the faulted converter and compensate for the chain losses.
This capability is accomplished through the operation of the High Speed Bus (HSB) and the online converter detachable switch modules.
A.2.1 H
IGH
S
PEED
B
US
(HSB)
In the "Daisy Chain" configuration, the backup Converter communicates with the online units through the high-speed interface bus (HSB). The backup Converter is able to detect faults and reconfigure itself to replace the faulted converter. The HSB interface is also used in the backup Converter to monitor configuration changes made to an online converter. Changes in frequency, gain, or polarity are immediately entered into the backup table as well as information from new online units. The high-speed bus does not interfere with the remote serial communication link access to any of the converters in the chain.
A.2.2 D
ETACHABLE
M
ODULES
Comtech EF Data's converters are designed with a detachable Input/Output Module
(IOM), which contain the signal path connectors. The IOM is utilized for single thread operation, or for testing of the unit.
For redundant "Daisy Chain" operations, the on-line Down Converters are provided with a detachable Receive Switch Module (RSM) replacing the IOM.
A.2.2.1 D
OWN
C
ONVERTER
S
WITCHING
The RSM contains IF switches for input/output looping of the signal. Options for the
RSM include SMA connectors for the RF Input signal, and 50 or 75
Ω BNC connectors for the IF.
42
DT4500 Series Down Converters
Redundant System Operation
MN/DT4500.IOM
Revision 1
R
EDUNDANT
C
ONFIGURATIONS
Comtech EF Data DT-4500 Series Down Converters can be configured in several different redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of a communication system. These configurations include:
Table 13. 4500 Series Down Converter Configurations
1:1 Redundant Subsystems
Single Source IF Output Configuration
The online converter uses an IF transfer switch to switch the IF signal. A single switched IF output is provided to and from the online converter. The transfer switches are contained in the Receive Switch Module (RSM) installed in the online converter. When a fault occurs in the online converter, the RSM is de-activated to switch out the online converter, and switch the IF output to the backup Converter.
Figure 21 is an illustration of the cable connections between the converters.
Figure 22 is a block diagram of this 1:1 redundant converter configuration.
Dual Source IF Output Configuration
Two IF outputs, IF output #1 (priority) and IF output #2, are switched in the
Receive Switch Module (RSM) to provide redundant operation of the converters.
The converters provide two switched IF outputs, IF output #1 (priority) and IF output #2. If converter #1 faults, converter #2 backs up the priority channel and IF signal #2 is not operational. Figure 25 is an illustration of the cable connections between the converters. Figure 26 is a block diagram of the 1:1 redundant, dual source RF input, converter configuration.
1:N Redundant Subsystems
An IF switch in the RSM is used to switch the IF output of a faulted online converter to the backup Converter. Figure 27 is an illustration of the cable connections between the converters.
Figure 28 is a block diagram of this 1:N redundant "Daisy Chain" converter configuration.
43
DT4500 Series Down Converters
Redundant System Operation
MN/DT4500.IOM
Revision 1
IOM-XX
J4 J5
IF
J4 J6 J8
RF
J5
J9
J3 HSB
IF
LP IN LP OUT RF LP OUT
CUSTOMER
SUPPLIED
RF DIVIDER
IF
OUTPUT
Figure 21. 1:1 Redundant Configuration - Single Source IF Output w/IOM and RSM-XX Installed
RF INPUT
DOW N CO NVERTER - IOM
(BACKUP UNIT)
IF
LOAD
Customer
Supplied
RF Divider
DOW N CO NVERTER - RSM
IF OUTPUT
Figure 22. 1:1 Redundant Configuration Diagram - Single Source IF Output w/IOM and RSM-XX Installed
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DT4500 Series Down Converters
Redundant System Operation
IF
Load
MN/DT4500.IOM
Revision 1
BU EQ
IF Out
LP Out
Down Converter - IOM
(Backup Unit)
RF In
LP In
LP In
Down Converter - TSEQM
(On line)
P1 - Pin 7
LP Out
EQ
Out
EQ
In
IF Out RF In
EQ
NO
(Closed When
EQ Faults)
Figure 23. 1:1 Redundant Configuration Diagram -
Single Source RF Input with IOM-XX and TSEQM-XX Installed
RF
Load
J3 HSB
J4
IF
J6 J8 J10 J11
J7
LP IN LP OUT EQ OUT EQ IN
J5
LP IN
RF OUT
J9
LP OUT
Figure 24. TSEQM Connection Locations
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DT4500 Series Down Converters
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MN/DT4500.IOM
Revision 1
IOM-XX
J4 J5
IF
J4 J6 J8
RF
J5
J9
IF
OUTPUT
#2
J3 HSB
IF
LP IN LP OUT RF LP OUT
CUSTOMER
SUPPLIED
RF DIVIDER
IF
OUTPUT
#1
IF
OUTPUT
#2
Figure 25. 1:1 Redundant Configuration - Dual Source IF Input
RF INPUT
DOWN CONVERTER - IOM
(BACKUP UNIT)
Customer
Supplied
RF Divider
DOWN CONVERTER - RSM
IF
OUTPUT
#1
Figure 26 1:1 Redundant Configuration Diagram
Dual Source IF Output with IOM-XX and RSM-XX Installed.
46
DT4500 Series Down Converters
Redundant System Operation
RF
INPUT
#1
POL = 1
IOM-XX
J4
BACKUP CONVERTER (BU)
J5 J?
RF
INPUT
#2
POL = 2
IF
RF RF
CUSTOMER
SUPPLIED
RF DIVIDER
CONVERTER No. 1
J4 J6
J8
J5
CUSTOMER
SUPPLIED
RF DIVIDER
IF
LP IN
LP OUT
RF
POL = 1
IF
OUTPUT
#1
J4 J6 J8 J5
IF
LP IN
LP OUT
RF
TO
CONN. J3 ON
CVTR. #3
IF
OUTPUT
#2
TO
CONN. J6
ON
CVTR. #3
TO
CONN. J3 ON
CVTR. #(N-1)
TO
CONN. J8 ON
CVTR. #(N-1)
J3 HSB IF
IF
OUTPUT
#3
J4 J6 J8
IF
LOAD
LP IN LP OUT
J5
RF
CONVERTER No. 2
POL = 2
CONVERTER No. N
POL = 1
Figure 27. Dual Source1:N Redundant Configuration with PSM-XX and RSM-XX Installed
47
MN/DT4500.IOM
Revision 1
DT4500 Series Down Converters
Redundant System Operation
RF INPUT
DOWN CONVERTER - PSM
(BACKUP UNIT)
DOWN CONVERTER - RSM #1
IF
OUTPUT
#1
IF
OUTPUT
#2
DOWN CONVERTER - RSM #2
DOWN CONVERTER - RSM #3
Customer
Supplied
RF Divider
IF
OUTPUT
#3
TO CONVERTER #4 IF
(LP IN) CONN. J6
TO CONVERTER #N-1 IF
(LP OUT) CONN. J8
IF
LOAD
DOWN CONVERTER - RSM #N
IF OUTPUT #N
Figure 28. Dual Source 1:N Redundant Configuration Diagram with PSM-XX and RSM-XX Installed
MN/DT4500.IOM
Revision 1
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MN/DT4500.IOM
Revision 1
A.3 R
EDUNDANT
S
YSTEM
C
ONFIGURATION
A.3.1 I
NITIAL
C
ONFIGURATION
Redundant system configuration is controlled from the converter’s front panel configuration menu. Each online unit is assigned a redundancy configuration address.
This address is dependent on the location of the online converter with reference to the backup. The unit closest to the backup must be converter # 1. The next unit down must be converter # 2. Figure 29 shows the appropriate entries for a 1:3 system
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-BU---1:03--
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-01----POL-1
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-02----POL-1
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-03----POL-1
Figure 29. 1:3 Front Panel Displays
Configure the online units first, and then configure the backup unit. Redundant polling starts when the backup is configured. If this polling starts before the online units are configured, a high-speed bus fault will result. This fault should clear when configuration is completed. At this point, control of the redundant system is performed from the backup
Converter.
49
DT4500 Series Down Converters
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Revision 1
In a single polarity system set “POL=1” on all online units. In a dual polarity system, where the BU has a Polarity Switch Module (PSM) installed, configure each unit to represent the RF feed it is connected to POL=1 or POL=2. See Figure 27.
A.3.2 A
UTOMATIC
C
ONFIGURATION
V
ERIFICATION
The backup Converter has a menu that allows the operator to choose, on a converter-byconverter basis, manual (M) or automatic (A) operating mode.
Figure 30 shows the system configured for automatic (A) operation. In this mode, failure of an online converter will automatically cause a switchover to the redundant unit to occur. In the field, the simplest way to test this mode is to turn off an online unit. The
AUTO/MANUAL selection is made in the converter. The online units will report their status as show in Figure 30.
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
-CONVERTER-123456789ABC-
-AUTO/MAN--AAA-----------
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
Figure 30. 1:3 System in AUTO Redundant Mode
50
DT4500 Series Down Converters
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Revision 1
Figure 31 depicts the front panel displays after power has been turned off on converter
#1. Note the on line LED is illuminated on the backup Converter. This indicates that the backup is now providing the frequency translation in place of the online unit. As soon as power is restored, converter #1 will come back online.
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
CONV-01-OFFSET=+00.00-DB
-ACTIVATE-BACKUP:-ACTIVE-
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-02---------
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-03---------
Figure 31. Converter #1 Being Backed Up
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Revision 1
A.3.3 M
ANUAL
C
ONFIGURATION
/V
ERIFICATION
Figure 32 shows the system with converter #1 configured for manual(M) operation. In this mode, the backup Converter can force switchover of an online unit. This mode also overrides fault status detection of the online units performed by the backup Converter. If an online unit is configured to manual mode and this unit faults, no switchover will occur.
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
-CONVERTER-123456789ABC-
-AUTO/MAN-MAA-----------
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
FREQ= 12XXX.XXX-MHz-MAN-
ATTN= 10.00-DB---Tx=ON--
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
Figure 32. Converter #1 in MANUAL, Others in AUTO
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Figure 33 shows the front panel displays after the backup has forced converter 1 offline.
Note the online LED allows the user to tell whether the backup is currently active and which converter is being by passed.
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
CONV-01-OFFSET=+00.00-DB
-ACTIVATE-BACKUP:-FORCED-
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-01---------
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-02---------
POWER ON
STATUS
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
REDUNDANCY-CONFIG?-ON---
-CONVERTER-#-03---------
Figure 33. Forced BU of Converter #1
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A.3.4 O
FFSET
A
DJUSTMENT
The offset is used to compensate for cable and switch losses. When the system is initially set up and tested, each converter needs to be forced to backup and the offset adjusted to minimize gain mismatch between the normal and bypassed mode. This offset will be different for each converter and is stored in a table in the backup unit.
Set the offset as follows:
1
Connect a signal source to the input and a power meter or spectrum analyzer to the output of the first online converter. Record the output power.
2
Force a backup of the first online unit and adjust the offset until the output power matches what was recorded in step one.
3
Restore the online unit and repeat for the other online units.
A.3.5 R
EDUNDANCY
S
YSTEMS
- C
ONVERTER
R
EMOVAL
In a redundancy system, to remove an “inline” converter for repair the following procedure must be used:
1
Force backup of faulted unit.
2
Turn the power switch on the inline converter rear panel to OFF, and remove the power cord from the converter. DO NOT disconnect the RF and IF cables from the RSM
Module.
3
Unscrew the mounting screws on the RSM Module first, and then unscrew the rack mounting screws on the front panel of the converter.
4
From the rear of the inline converter, hold the RSM Module and push the converter to the front of the rack until RSM Module is free of the converter chassis.
5
Remove the inline converter from the front of the rack.
To install the replacement unit, the following procedure must be used:
1
Power up the new unit on the bench.
2
Configure the new unit for the correct redundancy settings (Redundant = ON, Address = match old unit) and correct frequency and attenuation.
3
Power off the new unit.
4
Remove existing personality module from the new unit.
5
Carefully install the new unit into the rack. The existing module in the rack will be plugged into the new unit.
6
Power up the new unit and un-force the backup.
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To remove a “Backup” converter for repair the following procedure must be used:
1
Turn the power switch on the backup Converter rear panel to OFF, and remove the power cord from the converter. Disconnect the RF and IF cables from the IOM Module.
2
Unscrew the rack mounting screws on the front panel of the backup Converter.
3
Remove the backup Converter from the front of the rack.
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NOTES:
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Appendix B.
Remote Control
General 57
Protocol 58
Access Methods 59
Addresses 60
Message Structure
Command/Response Pairs
61
63
Error Processing 77
B.1 G
ENERAL
Each Comtech EF Data series Down Converter can be remotely controlled through a serial port. Primary (chained) converters in a redundancy subsystem can also be indirectly controlled through the backup Converter using virtual addressing. Comtech EF
Data’s simplified Command/Response protocol is easily invoked by either a monitor and control computer, a non-intelligent ASCII terminal or a laptop computer operating in terminal emulation mode. All converter configuration parameters as well as all monitor and status information is available via the remote port.
The Comtech EF Data converter family has been designed specifically to reduce the cost and complexity associated with operating in redundancy subsystem configurations. The backup Converter in the redundancy subsystem automatically monitors the configuration and status for each of the primary (chained) converters. This information is communicated via the High Speed Bus interface is updated at a polling rate of 1.95 milliseconds per primary converter. If a primary converter fails, the backup detects this event and automatically reconfigures itself to the proper frequency and attenuation setting providing minimal loss of traffic on the failed channel.
The result of this design is to greatly reduce the throughput requirements (i.e. polling rate) of earth station monitor and control systems. The backup Converter handles all of the ‘time critical’ tasks allowing the earth station monitor and control system to focus on less intelligent subsystems. This document specifies the remote control capabilities of the converter including hardware configuration and software command structure.
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B.2 P
ROTOCOL
B.2.1 T
RANSMISSION
M
ODE
The transmission mode is half duplex implemented in Command/Response convention.
This method requires the external system monitor and control unit to initiate all communications by command and all converters to respond with either confirmation or an error message. The confirmation may contain status information.
B.2.2 B
AUD
R
ATE
The default serial port Baud Rate is 9600. Baud rates of 1200, 2400, 4800, 19200, and
38400 are also supported.
B.2.3 F
ORMAT
The following parameters are the default character format.
1 Start Bit
8 Data Bits
No Parity Bit
1 Stop Bit
B.2.4 C
HARACTER
S
ET
The character set implemented is ASCII.
B.2.5 R
ESPONSE
T
IMEOUT
A minimum of 500 milliseconds should be provided before declaring a ‘no response’ instance, at which time the command should be re-transmitted.
B.2.6 B
US
I
NACTIVITY
R
EQUIREMENT
Comtech EF Data recommends that a minimum of 50 milliseconds bus inactivity be provided by the user between the receipt of a response from an addressed converter and issuing the next command on the serial bus.
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B.3 A
CCESS
M
ETHODS
Converters may be accessed directly by using a physical address or indirectly through a backup Converter by using a virtual address.
B.3.1 D
IRECT
A
CCESS
Converters may be directly accessed by the RS-232C interface or by the RS-485 interface in a bus configuration.
B.3.1.1 RS-485
In this control network, all converters including the backup Converter are paralleled on a common RS-485 cable. Both up and down converters can be mixed on the cable as long as each converter has a unique physical address. Only one RS-485 port is required on the system's monitor and control computer. If a change is initiated directly to a converter in a redundancy subsystem, the backup Converter will detect the change via the High Speed
Bus and update its backup tables.
B.3.1.2 RS-232
For RS-232 control, a direct RS-232 cable connection is made to each converter to be accessed. If an external Monitor and Control Computer is used, one RS-232 port per converter is required. This mode is commonly used with an ASCII terminal for bench testing.
B.3.2 I
NDIRECT
A
CCESS
Converters in Redundancy Mode may be addressed indirectly by adding a virtual address to the backup Converter's physical address. The virtual address corresponds to converter's position in the redundant subsystem. The backup Converter recognizes the virtual address and executes the command via the high-speed bus.
B.3.2.1 RS-485
To control by using the RS-485 interface, one or more backup Converters are connected to a system's monitor and control computer or ASCII terminal with a common RS-485 bus cable. Both up and down backup Converters may be mixed on the cable as long as each has a unique device address. In order to indirectly address an online converter in the subsystem, a virtual address must be provided. The virtual address corresponds to the converter's position in the chain beginning with number 1. Virtual addressing is only recognized by a backup Converter. Only one RS-485 port is required on the monitor and control computer.
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B.3.2.2 RS-232
To control by using the RS-232 interface, one RS-232 port on the monitor and control computer is required for each backup Converter. Virtual addressing must be established by command. All converters including the backup Converter must be in the Redundancy
Mode.
B.4 A
DDRESSES
All converters are addressed in a command by the Device Address. The Device Address consists of a physical address or a physical address plus a virtual address.
B.4.1 P
HYSICAL
A
DDRESS
Each converter in the system must have a unique physical address regardless of the access method used. The physical address consists of a string of 1, 2 or 3 numbers from
1 to 255. The physical address is entered into a converter via the front panel. For Direct
Access, the physical address is the only address required to command a converter. A backup Converter or a stand-a-lone converter can only be accessed with a physical address.
B.4.2 V
IRTUAL
A
DDRESS
In order to access a converter controlled by a backup Converter indirectly, a virtual address is required. A virtual address is appended to the physical address of the backup
Converter with a "V". The virtual address is a number from 1 to 12, corresponds to the position of the active converter from the backup Converter, and is assigned by a configuration command.
Example: 10V3 Addresses the third converter controlled by the backup converter whose physical address is 10.
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B.5 M
ESSAGE
S
TRUCTURE
The structure of a Command, Response or Error Message is as follows:
Start Character.
Device Address.
Command or Response.
End of Message String.
B.5.1 S
TART
C
HARACTER
The Start Character begins each message:
Example: < Start of a user Command.
> Start of a converter response.
B.5.2 D
EVICE
A
DDRESS
The Device Address consists of a Physical Address or a Physical Address and an appended Virtual Address. For this document, DEV is used for the generic case examples.
Example: <3V12
B.5.3 C
OMMAND
A Command is a variable length character string beginning with a / and containing either an instruction or an instruction and data for a converter to act upon. If data is passed by command, it is appended to the instruction by an underscore (_). If data is retrieved by, command underscore follows the instruction flagging the converter to supply data in a response. In this document /COM is used for the generic case examples.
Example: <DEV/COM_xxx'cr' Sends data to a converter.
Example: <DEV/COM_'cr' Requests information from a converter.
B.5.4 C
ONFIRMATION
R
ESPONSE
A confirmation will change the start character, and echo the Device Address and
Command. Any requested data will be appended to the Command.
Example: >DEV/COM_xxx'cr''lf']
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B.5.5 E
RROR
R
ESPONSE
If a converter cannot execute a Command or detects a protocol violation, an error response is generated. An error is flagged by changing the "/" command designator in the response to a "?". Following the "?" error symbol are two characters which are unique error symbols useful for computer analysis. The two error symbols are followed by a text string explaining the error for the convenience of a human operator. For this document,
ER is used for the generic case examples response.
Example: >DEV?COM ER Error Message 'cr''lf']
B.5.6 E
ND
O
F
M
ESSAGE
End of message strings were devised in such a way that an orderly screen presentation would result when converters are controlled by simple ASCII terminals.
B.5.6.1 C
OMMAND
E
NDING
The end of message for a command is a carriage return. For this document, 'cr' is used for the carriage return.
Example: <DEV/COM_'cr'
B.5.6.2 R
ESPONSE
E
NDING
End of message for a response is a carriage return, line feed and a bracket: 'cr''lf'].
Example: >DEV/COM_'cr''lf']
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B.6 C
OMMAND
/R
ESPONSE
P
AIRS
B.6.1 U
TILITY
C
OMMANDS
B.6.1.1 T
IME
Command
Set Time:
Details
<DEV/TIM_hh:mm:ss'cr'
Confirmation: >DEV/TIM_hh:mm:ss'cr''lf']
Retrieve Time: <DEV/TIM_'cr'
Confirmation: >DEV/TIM_hh:mm:ss'cr''lf'] hh = Hour* mm = Minutes ss = Seconds
* 24 hour military time is used.
B.6.1.2 D
ATE
Command
Set Date:
Confirmation:
Retrieve Date:
Details
<DEV/DAT_mm/dd/yy'cr'
>DEV/DAT_mm/dd/yy'cr'lf']
<DEV/DAT_'cr' mm = Month dd = Day
Confirmation: >DEV/DAT_mm/dd/yy'cr''lf'] yy = Year
B.6.1.3 P
HYSICAL
A
DDRESS
The default Physical Address from is 1.
Command
Set Physical Address:
Details
<DEV/SPA_xxx'cr' xxx = 1 to 255
Confirmation: >DEV/SPA_xxx'cr''lf']
Retrieve Phys. Addr: <DEV/SPA_'cr'
Confirmation: >DEV/SPA_xxx'cr''lf']
B.6.1.4 B
AUD
R
ATE
The default baud rate is 9600.
Command
Set Baud Rate:
Details
<DEV/SBR_xxxx'cr' xxxx = 1200, 2400, 4800, 9600, 19K2, or 38K4
Confirmation: >DEV/SBR_xxxx'cr''lf']
Retrieve Baud Rate: <DEV/SBR_xxxx'cr'
Confirmation: >DEV/SBR_xxxx'cr''lf']
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B.6.1.5 LCD C
ONTRAST
The default is 15.
Command Details
Set Contrast: <DEV/CON_xx'cr'
Confirmation: >DEV/CON_xx'cr''lf']
xx = 0 to 30
Retrieve Contrast: <DEV/CON_'cr'
Confirmation: >DEV/CON_xx'cr''lf']
B.6.1.6 LCD B
RIGHTNESS
The default is 15.
Command
Set Brightness
Details
<DEV/LCD_xx'cr' xx = 0 to 30
Confirmation: >DEV/LCD_xx'cr''lf']
Retrieve Brightness: <DEV/LCD_'cr'
Confirmation: >DEV/LCD_xx'cr''lf']
B.6.1.7 R
EFERENCE
O
SCILLATOR
T
UNING
The default is 87.
Command
Set Oscillator:
Details
<DEV/SRO_xxx'cr' xxx = 0 to 255
Confirmation: >DEV/SRO_xxx'cr''lf']
Retrieve Tuning: <DEV/SRO_'cr'
Confirmation: >DEV/SRO_xxx'cr''lf']
B.6.1.8 C
ONVERTER
S
LOPE
A
DJUSTMENT
The default is 0.3.
Command Details
Set Slope Adjust: <DEV/SSA_xxx'cr' xxx = 0.0 to 1.0
Confirmation: >DEV/SSA_xxx'cr''lf']
Retrieve Slope Adjust: <DEV/SSA_'cr'
Confirmation: >DEV/SSA_xxx'cr''lf']
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B.6.1.9 E
QUIPMENT
T
YPE
Equipment Type is a command that retrieves the model number and software version of the equipment. The information cannot be changed by command.
Command Details
Retrieve Equipment Type: <DEV/RET_'cr'
Confirmation: >DEV/RET_xxxxxxxxxx yyyyyyy'cr’’lf'] xxxxxxxxxx = Model Number yyyyyyy = Software Version.
B.6.1.10 F
IRMWARE
I
NFORMATION
Retrieves the firmware information of the unit.
Command
Retrieve Firmware
Information:
Details
<DEV/FRW_’cr’
Confirmation: >DEV/FRW_’cr’
BULK= FWnnnn-nr Ver=x.xx’cr’
M&C = FWnnnn-nr Ver=x.xx’cr’
FPGA= FWnnnn-nr Ver=x.xx’cr’’if’]
Where: nnnn-n firmware number r firmware
Note: BULK, M&C, and FPGA have different firmware numbers, revisions, and versions among each other.
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B.6.1.11 A
PPLICATION
I
DENTIFICATION
The Application Identification (AID) command allows a free form message to be created.
It is intended to identify the satellite, either transponder, beam, destination or other aspects of the application that may be significant to operations.
The message length corresponds to capability of the LCD and is 48 characters in total.
The second line begins at character 25, therefore, blanks must be used after line 1 information in order to space to line 2. A carriage return ends the command. Trailing blanks will be generated to fill the LCD field. The AID display will alternate with the
Equipment type display by use of the clear function key on the front panel. The default is
"AID MESSAGE".
Command
Application ID:
Details
<DEV/AID_xxxxxxx ... xxxxx'cr'
Confirmation: >DEV/AID_'cr'
xxxxxxxxxxxxxxxxxxxxxxxx'cr'
xxxxxxxxxxxxxxxxxxxxxxxx'cr''lf']
Retrieve ID: <DEV/AID_'cr'
Confirmation: >DEV/AID_'cr'
xxxxxxxxxxxxxxxxxxxxxxxx'cr'
xxxxxxxxxxxxxxxxxxxxxxxx'cr''lf']
Note: xxxxxxx ... xxxxx = Your message, maximum 48 characters.
B.6.2 C
ONFIGURATION
C
OMMANDS
B.6.2.1 F
REQUENCY
The default is RF
Low
MHz (e.g.; 14000.000 MHz for Model UT-4514).
Command
Set Frequency:
Details
<DEV/FRE_xxxxx.xxx'cr'
Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf']
Retrieve Frequency: <DEV/FRE_'cr'
Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf']
Note: For example, xxxx.xxx = 14000.000 to 14500.000 MHz in 125 KHz steps for Model UT-
4514.
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B.6.2.2 A
TTENUATOR
The default is 10 dB.
Command
Set Attenuator:
Details
<DEV/ATT_ yy.yy'cr'
Confirmation: >DEV/ATT_yy.yy'cr'lf']
Retrieve Attenuator: <DEV/ATT_'cr'
Note: yy.yy = 0.0 to 25.00 dB in 0.25 steps.
B.6.2.3 C
OLD
S
TART
The cold start function, if enabled, mutes the output signal for a predetermined time following Power-Up to ensure a stable reference oscillator (15 minutes). The default is
OFF. This command is disabled in redundant systems (i.e. COMMAND NOT
AVAILABLE).
Command
Set Cold Start:
Details
<DEV/CLD_xxx'cr'
Confirmation: >DEV/CLD_xxx'cr''lf'] xxx = ON or OFF
Retrieve Status: <DEV/CLD_'cr'
Confirmation: >DEV/CLD_xxx'cr''lf']
B.6.2.4 M
UTE
The default is ON.
Command
Mute Output:
Details
<DEV/MUT_xxx'cr'
Confirmation: >DEV/MUT_xxx'cr''lf']
Retrieve Mute
Status:
<DEV/MUT_'cr' xxx = ON or OFF
Confirmation: >DEV/MUT_yyy'cr''lf'] yyy = ON/OFF/COLD
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B.6.2.5 A
UTO
F
AULT
R
ECOVERY
The converter output is automatically muted in the event of a detected fault. Auto Fault
Recovery, if enabled, will cause the output signal to go active (unmuted) if all faults clear. If disabled, the output will remain muted even after all faults clear until a
MUT_OFF command is received (see 4.8.2.4). If Auto Fault Recovery is enabled and the converter detects the same fault, more than five times in a five minute interval (ex: multiple IFLO lock detect faults) the function reverts to DISABLED and the converter remains muted. The default is ON.
Command Details
Set Fault Recovery: <DEV/AFR_xxx'cr'
Confirmation: >DEV/AFR_xxx'cr''lf']
Retrieve Status: <DEV/AFR_'cr' xxx = ON or 0FF
Confirmation: >DEV/AFR_xxx'cr''lf']
B.6.2.6 P
ROGRAM
P
RESET
This command is used to stores up to 32 preset frequency and attenuation settings.
Command
Program Preset:
Details
<DEV/PGM_nn_xxxxx.xxx_yy.yy'cr'
Confirmation: >DEV/PGM_nn_xxxxx.xxx_yy.yy'cr''lf']
Note: nn = Preset Number = 01 to 32. xxxx.xxx = Frequency = RF
Model UT-4513).
Low
to RF
High
(for example, 10950.000 to 12750.000 MHz for yy.yy = Attenuator = 00.00 to 25.00.
B.6.2.7 D
ISPLAY ALL
P
RESETS
This command is used to display all programmed preset numbers.
Command
Display Presets:
Details
<DEV/DPS_'cr'
Confirmation: >DEV/DPS_'cr'
P01 xxxxx.xxx yy.yy'cr'
to
P32 xxxxx.xxx yy.yy'cr''lf']
Where: xxxxx.xxx Frequency
yy.yy= Attenuator
Note: Only programmed preset numbers are returned. If no preset(s) is programmed, “No Pre-
Selects Programmed” is returned.
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B.6.2.8 C
LEAR
P
RESET
This command is used to clear a preset number.
Command Details
Clear a Preset: <DEV/CLR_nn'cr'
Confirmation: >DEV/CLR_nn_Cleared'cr''lf']
Note: nn = Preset Number = 01 to 32.
B.6.2.9 S
ELECT A
P
RESET
This command is used to configure the converter to the frequency and attenuation data assigned to a given preset number.
Command
Select Preset:
Details
<DEV/SEL_nn'cr'
Confirmation: >DEV/SEL_nn_Selected'cr''lf']
Note: nn = Preset Number = 01 to 32.
Only programmed preset numbers are available.
B.6.3 M
ODES
There are two modes of operation that may intersect: Redundant Mode and Automatic
Mode.
B.6.3.1 R
EDUNDANCY
M
ODE
Since the default mode is OFF, each converter including the backup Converter must be commanded into the Redundancy Mode.
Polling on the high-speed bus will not begin until the position assignments are made.
Command Details
Redundancy Mode: <DEV/RED_xxx'cr'
Confirmation: >DEV/RED_xxx'cr''lf']
Redundancy Status: <DEV/RED_'cr' xxx = ON or OFF
Confirmation: >DEV/RED_xxx'cr''lf']
Each converter's chain position must be initialized including the backup Converter. The following redundancy initialization command is only allowed if Redundancy Mode has been selected.
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Command Details
Initialize Command: <DEV/ICT_xx_yy'cr'
Confirmation: >DEV/ICT_xx_yy'cr''lf']
Initialize Status: <DEV/ICT_'cr'
Confirmation: >DEV/ICT_xx_yy'cr''lf'] xx = chain position = 01 to 12, or BU. Where BUselects the converter as the backup. yy = chain length for xx = BU (i.e. Backup Converter) 01 to 12. yy = P1 or P2, single or dual polarity
Example 1: The following command assigns the converter chain position "1".
<DEV/ICT_01'cr'
>DEV/ICT_01'cr''lf']
Example 2: The following command assigns the receiving converter as the backup converter in a 1:8 system.
<DEV/ICT_BU_08'cr'
>DEV/ICT_BU_08'cr''lf']
It should be reiterated that only the converter physically located at the top of a redundant rack should be assigned as the Backup unit. Likewise, assignment of chain positions in a redundant rack should be made according to the physical allocation of each converter in the rack (i.e. The top converter should be the Backup, the second converter should be assigned chain position 1, the third converter position 2, etc.).
B.6.3.2 A
UTOMATIC
/M
ANUAL
M
ODE
This command provides for automatic switching by the backup Converter if both units are in the Redundancy Mode. This command is only accepted by the backup Converter.
If a chain converter is set in Manual Mode, the backup Converter will log the occurrence and not act upon further information from the converter until put into Automatic Mode.
The default is off.
Command Details
Automatic Mode: <DEV/SAM_xx_y'cr'
Confirmation: >DEV/SAM_xx_y'cr''lf']
Automatic Status: <DEV/SAM_xx_'cr'
Confirmation: >DEV/SAM_xx_y'cr''lf']
Where: xx = 01 to 12, converter number y = A for Auto; M for Manual
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B.6.3.3 B
ACKUP
M
ODE
This command allows the user to force a backup condition for maintenance and test purposes. This command must be sent to the converter designated as the backup
Converter (i.e., “BU”). When activated this command forces the backup Converter to assume the state of the specified chain converter and forces the chain converter offline.
Command
Initiate a Backup:
Details
<DEV/FBU_xx_y'cr'
Confirmation: >DEV/FBU_xx_y'cr''lf']
Where: xx = 01 to 12, converter number y = ‘F’ to force a backup ‘N’ to remove a backup
Retrieve Backup
Status:
<DEV/FBU_'cr'
Confirmation: >DEV/FBU_xx_zzzzz'cr''lf']
Where: xx = 01 to 12, converter number. If zzzzz = NONE, converter number is not displayed. zzzzz = ‘NONE’ if no backup active
= ‘ACTIVE’ if an automatic backup has occurred
= ‘FORCED’ if a forced backup is active
B.6.4 S
TATUS
C
OMMANDS
Status commands retrieve configuration, maintenance and alarm status in summary form.
B.6.4.1 C
ONFIGURATION
S
TATUS
Command Details
Configuration Status: <DEV/RCS_'cr'
Confirmation: >DEV/RCS_'cr'
FRE_xxxxx.xxx'cr'
Attenuator
ONL_nnn'cr'
RED_xx_yy_z'cr' See
CLD_nnn'cr'
Receive
-
Note
Cold Start - ON/OFF
AFR_nnn'cr'
EXT_xxx'cr''lf'] Ext. Ref. - YES/NO
Note: If Redundancy OFF, xx_yy_z = OFF. If Redundancy ON and converter selected as backup controller, xx_yy_z = BU_yy where yy is the number of converters in the chain
(i.e. 01 to 12). If Redundancy ON and converter is selected as a chain unit xx is the converter number (01 to 12), yy = P1 or P2 for single or dual polarity system, and z = A if
Auto Mode or M if Manual Mode.
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B.6.4.2 M
AINTENANCE
S
TATUS
Command Details
Maintenance Status: <DEV/RMS_'cr'
Confirmation: >DEV/RMS_'cr'
P15_xx.x'cr' 15 Vdc Supply
P14_xx.x'cr' 14 Vdc Supply
VCC_x.x'cr'
TEM_xx'cr'
Supply
5VD_x.x'cr' Display 5 Vdc
Temperature
IFL_xx.x'cr'
SUM_xx.x'cr' Sum Loop Tuning
COR_xx.x'cr' Coarse Loop Tune
FIN_xx.x'cr''lf'] Fine Loop Tuning.
B.6.4.3 U
TILITY
S
TATUS
Command
Utility Status:
Details
<DEV/RUS_'cr'
Confirmation: >DEV/RUS_'cr'
COMM_aaaaaa'cr'
ADD_xxx'cr'
BR_nnnn'cr'
Address (001 to 255)
Baud Rate (1200, 2400, 4800, 9600,
19K2,
FMT_x-y-z’cr’ Data Format x=data, y=parity, z=stop
bit 7-O-2)
REF_xxx'cr'
SLP_x.x'cr'
Osc. Adjust (000 to 255)
Slope Adjust (0.0 to 1.0)
CON_xx'cr'
LCD_xx'cr''lf']
LCD Contrast (0 to 30)
LCD Brightness (0 to 30).
B.6.4.4 A
LARM
S
TATUS
Command
Alarm Status:
Details
<DEV/RAS_'cr'
Confirmation: >DEV/RAS_'cr'
P15_xx'cr'
P14_xx'cr'
15 Vdc Fault
14 Vdc Fault
5VD_xx'cr' 5VD
TEM_xx'cr'
IFL_xx'cr'
VCC
Fault
Fault
IFLO Lock Fault
SUM_xx'cr' Sum Lock Fault
COR_xx'cr' Coarse
FIN_xx'cr'
HSB_xx’cr’
Fault
Fine lock Fault
High Speed Bus Fault
*REF_xx'cr''lf'] Ref. Lock Fault xx = OK or FT
Note: REF_xx is only returned if an external reference is present.
72
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Revision 1
B.6.4.5 S
UMMARY
A
LARM
S
TATUS
Summary alarm is set to Fault (FT) if any of the items in Paragraph B.6.4.4 are faulted.
Command
Summary Alarm:
Details
<DEV/SAS_'cr' xx = OK or FLT
Confirmation: >DEV/SAS_xx'cr''lf']
B.6.4.6 T
ERMINAL
S
TATUS
C
HANGE
The TSC_ command can be used to determine if the status of the terminal has changed since it was last polled. If any of the parameters listed in the RCS or RUS commands have changed as a result of user front panel operations or remote operations or if any new fault condition occur the TSC_ command will return YES. The TSC_ command will then continue to return YES until any of the following commands are received: RCS_,
RUS_, RAS_, PACRCS_, PACRUS_, or PACRAS.
Configuration Status: <DEV/TSC_'cr'
B.6.4.7 P
ACKED
C
ONFIGURATION
S
TATUS
Configuration Status: <DEV/PACRCS_'cr'
>DEV/PACRCS_aaaabbbcdeffgghijkl'cr''lf']
where: aaaa = # of 125kHz steps above base frequency
1 bbb = # of 0.25 dB steps above 0.00 dB
2 c = 1 if Transmitter ON, 0 if OFF, 2 if Cold d = 1 if unit ONLINE, 0 if OFFLINE e = 1 if Redundancy ON, else 0 ff = converter # (01-12,BU or 00 if e = 0) gg = 00 if 'ff' is 00 (redundancy OFF) gg = chain length (01-12) if 'ff' is BU gg = XX if 'ff' = 01 - 12 h = A if Auto Mode, M if Manual
3
I = 1 if Cold Start Enabled, else 0 j = 1 if Auto recovery enabled, else 0
K = 1 if an Ext. Ref is present, else 0 l = 1 if Remote Mode, 0 if Local Mode
Notes: 1
If the converter is 1 kHz step size, this will be the number of 1 kHz steps above the base frequency
2
If the converter is 0.1 -dB step size, this will be the number of 0.1 -dB steps above the base frequency
3
If it is a backup Converter, it is always ‘A’.
4
If it is the primary converter, gg = P1 or P2 (single or dual polarity system.
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DT4500 Series Down Converters
Remote Control
MN/DT4500.IOM
Revision 1
B.6.4.8 P
ACKED
M
AINTENANCE
S
TATUS
Packed Maintenance Status: <DEV/PACRMS_'cr'
where: aa = V15 scaled 123mV per count (0x00 - 0xFF) bb = V14 scaled 123mV per count (0x00 - 0xFF) bc = VCC scaled 39mV per count (0x00 - 0xFF) dd = V5D scaled 39mV per count (0x00 - 0xFF) eee = signed Temperature in degrees C (-10 to +60) ff = IFLO tune scaled 67mV per count (0x00 - 0xFF) gg = SUM tune scaled 54mV per count (0x00 - 0xFF) hh = COARSE tune scaled 78mV per count(0x00 - 0xFF) ii = FINE tune scaled 89mV per count (0x00 - 0xFF)
B.6.4.9 P
ACKED
U
TILITY
S
TATUS
Packed Utility Status: <DEV/PACRUS_'cr'
>DEV/PACRUS_abbcdeeffghhii'cr''lf']
where: a = 0=RS-232, 1=RS-485 bb = Address in hex (01 to FF) c = 0 if Baud Rate 38400
= 1 if Baud rate 19200
= 2 if Baud rate 9600
= 3 if Baud rate 4800
= 4 if Baud rate 2400
= 5 if Baud rate 1200 d = 0 if Data Format 8-N-1
= 1 if Data Format 7-E-2
= 2 if Data Format 7-O-2 ee = Osc. Adjust in hex (00 to FF) ff = Slope Adjust times by 10 (00 to 10) g = Always 0, unused hh = LCD Contrast (0 to 30) ii = LCD Brightness (0 to 30)
74
DT4500 Series Down Converters
Remote Control
B.6.4.10 P
ACKED
A
LARM
S
TATUS
Packed Alarm Status: <DEV/PACRAS_'cr'
MN/DT4500.IOM
Revision 1
where: a = 1 if V15 Fault, else 0 b = 1 if V14 Fault, else 0 c = 1 if VCC Fault, else 0 d = 1 if V5D Fault, else 0 e = 1 if TEMP Fault, else 0 f = 1 if IFLO Fault, else 0 g = 1 if SUM Fault, else 0 h = 1 if COARSE Fault, else 0
I = 1 if FINE Fault, else 0 j = 1 if HSB Fault, else 0 k = 1 if EXT REF Fault, else 0
B.6.5 S
TORED
A
LARM
The 100 alarms are date/time stamped and stored in memory as they occur. The alarm entry is also updated with its date/time of clearance. The entry remains in memory until it is removed by command.
B.6.5.1 T
OTAL
S
TORED
A
LARMS
This command retrieves the total number of stored alarms and the time and date of the most recent alarm.
Retrieve Total Alarms: <DEV/TSA_'cr'
where: nn = 0 to 99; the 100 th
alarm will be ER hh.mm.ss = time in hour:minute:second mm/dd/yy = date in month/day/year
B.6.5.2 C
LEAR
A
LL
S
TORED
A
LARMS
75
DT4500 Series Down Converters
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MN/DT4500.IOM
Revision 1
B.6.5.3 L
IST
A
LL
A
LARMS
This command retrieves a list of the stored alarms. This command is currently unavailable when using virtual addressing mode.
List All Alarms: <DEV/LAA_'cr' xx yyyyyyyyyyy hh:mm:ss mm/dd/yy'cr'
" " " "
" " " " xxx yyyyyyyyyyy hh:mm:ss mm/dd/yy'cr''lf']
Where: xx = stored fault number yyyyyyyyyyy = fault description hh:mm:ss = fault time mm/dd/yy = fault date
76
DT4500 Series Down Converters
Remote Control
MN/DT4500.IOM
Revision 1
B.7 E
RROR
P
ROCESSING
B.7.1 G
ENERAL
E
RRORS
The following Error Responses may be generated by any command instead of a confirmation:
>DEV?COM CU CMD UNRECOGNIZED'cr''lf']
>DEV?COM IP INVALID PARAM'cr''lf']
>DEV?COM PE PARITY ERROR'cr''lf']
B.7.2 C
ONFIGURATION
E
RRORS
The following Error Responses may be generated by configuration commands:
>DEV?COM LO DEVICE IN LOCAL MODE'cr''lf']
B.7.3 M
ODE
E
RRORS
The following Error Responses may be generated by Mode selection:
>DEV?COM AE ONLY VALID WHEN BACKUP'cr''lf']
>DEV?COM OE OFFLINE NOT AVAILABLE'cr''lf']
>DEV?COM CN COMMAND NOT AVAILABLE'cr''lf']
B.7.4 T
IME
-O
UTS
A time-out should be assumed if there is no response in 500 milliseconds. The station monitor and control computer should try at least three times.
77
DT4500 Series Down Converters
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Revision 1
B.8 C
ONVERTER
R
EMOTE
C
OMMAND
S
UMMARY
Table 14. Remote Command Summary
Utility
Set Time
Set Date
Set Physical Address
Set Baud Rate
Set LCD Contrast
Set LCD Brightness
Set Reference Oscillator
Set Converter Slope Adj.
Commands
<DEV/TIM_hh:mm:ss'cr'
<DEV/DAT_mm/dd/yy'cr'
Paragraph
B.6.1.1
B.6.1.2
<DEV/SPA_xxx'cr'
<DEV/SBR_xxxx'cr'
<DEV/CON_xx'cr'
B.6.1.3
B.6.1.4
B.6.1.5
<DEV/LCD_xx'cr' B.6.1.6
<DEV/SRO_xxx'cr' B.6.1.7
<DEV/SSA_xxx'cr' B.6.1.8
Retrieve Equipment Type
Retrieve Firmware Information
Set Application ID Message
Configuration
<DEV/RET_'cr'
<DEV/FRW_'cr'
<DEV/AID_xxxxx...xxxxx'cr'
Commands
B.6.1.9
B.6.1.10
B.6.1.11
Paragraph
Set Frequency
Set Attenuation
Select Cold Start Mode
<DEV/FRE_xxxxx.xxx'cr' B.6.2.1
<DEV/ATT_xx.xx'cr' B.6.2.2
<DEV/CLD_xxx'cr' B.6.2.3
Mute/Unmute Converter <DEV/MUT_xxx'cr'
Select Auto Fault Recovery Mode <DEV/AFR_xxx'cr'
Program a Preset
B.6.2.4
B.6.2.5
<DEV/PGM_nn_xxxxx.xxx_yy.yy'cr' B.6.2.6
Display All Presets
Clear a Preset
<DEV/DPS_'cr'
<DEV/CLR_nn'cr'
B.6.2.7
B.6.2.8
Select a Preset
Redundancy Mode
<DEV/SEL_nn'cr'
Commands
Select Redundancy ON/OFF <DEV/RED_xxx’cr’
Configure Redundant Converter <DEV/ICT_xx_yy’cr’
Select Auto/Manual Mode <DEV/SAM_xx_y'cr'
Forced Backup Mode <DEV/FBU_xx_y'cr'
B.6.2.9
Paragraph
B.6.3.1
B.6.3.1
B.6.3.2
B.6.3.3
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Revision 1
Status
Retrieve Configuration Status
Retrieve Maintenance Status
Retrieve Utility Status
Retrieve Alarm Status
Summary Alarm Status
Commands
<DEV/RCS_'cr'
<DEV/RMS_'cr'
Paragraph
B.6.4.1
B.6.4.2
<DEV/RUS_'cr' B.6.4.3
<DEV/RAS_'cr' B.6.4.4
<DEV/SAS_'cr' B.6.4.5
Terminal Status Change <DEV/TSC_'cr'
Packed Configuration Status <DEV/PACRCS_'cr'
Packed Maintenance Status
B.6.4.6
B.6.4.7
<DEV/PACRMS_'cr' B.6.4.8
Packed Utility Status
Packed Alarm Status
<DEV/PACRUS_'cr' B.6.4.9
<DEV/PACRAS_'cr' B.6.4.10
Stored Alarm
Retrieve Total Stored Alarms
Clear All Stored Alarms
List All Stored Alarms
Commands
<DEV/TSA_'cr'
<DEV/CAA_YES'cr'
<DEV/LAA_'cr'
Paragraph
B.6.5.1
B.6.5.2
B.6.5.3
79
DT4500 Series Down Converters
Remote Control
NOTES:
80
MN/DT4500.IOM
Revision 1
Appendix C.
Theory of Operation
Applications 81
RF Signal Conversion 82
Monitor & Control 84
Installation, Operation and Maintenance 84
C.1 A
PPLICATIONS
This appendix contains a general description of the theory of operation for the Model DT-
4500 Series Down Converters. The DT-4500 Series Down Converters are used for
SCPC, DAMA AND TDMA, as well as for full transponder HDTV and analog TV, applications.
The converter operates over the RF frequency range with a typical gain of 35 dB. The
RF output level is +10 dBm at 1 dB compression allowing the capability for longer cable runs to compensate for splitting networks without adding options such as external line amplifiers.
The phase noise performance exceeds the Intelsat phase noise mask for IBS and IDR services by more than 9 dB. This allows high capacity earth stations to add more demodulators and still meet transmission standards. The close-in phase noise is also very low make the converter ideal for low bit rate digital circuits such as used in DAMA hub earth stations.
A selectable RS-232C or RS-485 remote control serial communications connector interface is provided on the rear of the converter. All configuration control, status retrieval and adjustments are available as ASCII commands through the serial interface, or as local operator input command to the converter.
A detachable Input/Output Module (IOM) can be mounted in the rear of the converter chassis for switching the RF output for single thread operations, or for testing the output of the unit. The connectors for the IOM are located on the rear panel.
In applications where converters are "Daisy Chained" together to provide distributed online protection switching to a backup Converter, the IOM is replaced with a detachable
Transmit Switch Module (TSM). The TSM contains RF and IF transfer switches. Type
N connectors are provided for the RF loop, and 50 or 75 ohms BNC connectors are provided for the IF loop.
81
DT4500 Series Down Converters
Theory of Operation
MN/DT4500.IOM
Revision 1
The "Daisy Chain" configuration is designed to chain the IF output of up to twelve (12) on-line converters together through RSM's terminating in a backup Converter. When a fault occurs in an on-line converter, the RSM in the converter with the fault is commanded to switch to the backup Converter. The backup Converter performs the fault detection, self-reconfiguration and the logical switching functions. If the backup
Converter has a fault, it will not attempt to perform the protection-switching task. If the backup Converter does not have a fault, it will assume the frequency and attenuation of the faulted on-line converter, and compensate for the chain losses.
The backup Converter in the "Daisy Chain" communicates with the on-line converters through a high speed (data interface) bus (HSB). When faults are detected, the backup
Converter re-configures itself to replace the on-line converter with the fault. The backup
Converter also uses the HSB to monitor configuration changes made to the on-line converters by either remote control or front panel command inputs. Changes in frequency, attenuation or polarity are entered into the backup table as they are made, as well as information from new on-line units. The HSB does not interfere with the remote control communications link for access to any of the converters in the "Daisy Chain".
The DT-4500 Series Down Converters are a standard 19 inch rack mounted units, 1.75 inches in height. The converter is 22 inches deep, and weighs 25 pounds. Prime power the converter can be either 100 to 125 Vac, or 205 to 240 Vac, at 47 to 63 Hz (or provided with an optional -48 Vdc prime power input). The power dissipation is 60 watts. The converter can operated in a temperature environment of 0 to 50 degrees C at
10,000 feet altitude in 0 to 95% relative humidity.
C.2 RF S
IGNAL
C
ONVERSION
As a typical example of the RF signal processing, the RF input to the DT-4512 Down
Converter is 12200 to 12750 MHZ at a typical level of -45 dBm. The RF is mixed in the first mixer with a 13280 to 13830 MHZ synthesizer signal from a multiplier, in 125 KHz fine tuning steps. The synthesizer is locked to a 5/10 MHZ reference oscillator. The first mixer is located in the converter Signal Path Module, and the synthesizer consists of a
Coarse/Fine Step Module and a Sum Loop Module.
The intermediate IF is 1080 MHZ which is mixed in the second mixer with the1150
MHZ IFLO providing a +20 dBm, at 1 dB compression, 70 MHZ IF output. The second mixer is also located in the converter Signal Path Assembly.
Figure 34 is a typical functional block diagram of the converter.
82
DT4500 Series Down Converters
Theory of Operation
RF INPUT
(12200-12750 MHz)
I/O MODULE
MN/DT4500.IOM
Revision 1
IF OUTPUT
(70 or 140 MHz)
MONITOR
&
CONTROL
OSC
CONVERTER
SIGNAL PATH
MODULE
SYNTHESIZER
OSC.
5/10 MHz
REF. OSC.
POWER SUPPLY
Figure 34. Typical Converter Functional Block Diagram (Model UT-4512 shown)
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MN/DT4500.IOM
Revision 1
C.3 M
ONITOR
& C
ONTROL
The Monitor & Control Assembly is designed to monitor the functions of the converter, and provide the control for remote and local command inputs to the converter. Remote control inputs are provided through the RS-232C or RS-485 communications port on the rear of the panel, or by local operator inputs through the keypad on the front panel. Local operator input commands and the status of the converter are displayed on the LCD display on the front panel.
A converter fault is indicated by the LED indicator on the front panel. Specific fault conditions are displayed on the LCD display through local keypad input commands.
C.4 I
NSTALLATION
, O
PERATION AND
M
AINTENANCE
Refer to Chapter 1 for a functional description of the converter interfaces.
Refer to Chapter 2 for converter installation and mounting instructions.
Refer to Chapter 3 for converter operating instructions and procedures.
Refer to Appendix A for redundant system operating instructions and procedures.
Refer to Appendix B for converter remote control operating instructions and procedures.
Refer to Appendix D for converter maintenance and troubleshooting procedures.
84
Appendix D.
Maintenance and Troubleshooting
Overview 85
Maintenance Testing 86
Spare 89
D.1 O
VERVIEW
This appendix is intended to provide procedures to assist operator and maintenance personnel in the checkout, maintenance and troubleshooting of the converter.
Comtech EF Data recommends that spare replacement converters be used to replace converters removed from the system for maintenance. Troubleshooting procedures are provided for fault isolation to the module level.
The input and output signals, the interconnecting cables and the location of the modules are as shown in Figure 35.
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MN/DT4500.IOM
Revision 1
Prime Power Cord Input
5/10 MHz Ref. Osc. Input J2
Summary Fault Relay Output P1
Serial Comm. Interface
(RS-485 / RS-232C)- COM 1
J1
High Speed Bus (HSB) J3
IF Input (IF)
IF Loop Input (LP IN)
IF Loop Output (LP OUT)
RF Output (RF)
RF Loop Input (LP IN)
RF Loop Output (LP OUT)
J4
J6
J8
J5
J7
J9
Power
Supply
Transmit
I/O Switch
Module
(TSM)
Reference
Oscillator
Monitor & Control Assembly
RF Converter
Fine
Step
Module
Sum
Loop
Module
Figure 35. Converter Signal and Interconnecting Cable Diagram
(with TSM Switching Module).
D.2 M
AINTENANCE
T
ESTING
Use the instructions in Chapter 2, Installation, for installing the converter for checkout, and the procedures in Chapter 3, System Operation, for operating the converter.
The converter is a Down Converter which translates the input RF frequency to an output
IF frequency. The RF input level is -45 dBm (typical), and the RF output level is 0 dBm
(typical).
D.2.1 T
EST
P
OINT
S
AMPLES
The IF output and RF input can be monitored at the RF Sample Test Points on the front panel. A BNC connector is provided for the IF sample, and an SMA connector is provided for the RF output. The RF sample output level is -20 dBc nominal, and the IF sample level is -20 dBc nominal.
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DT4500 Series Down Converters
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MN/DT4500.IOM
Revision 1
D.2.2 T
ROUBLESHOOTING
Converter operating problems can be identified by first observing the status indicators on the front panel. When a fault condition is indicated, the specific fault, or faults, can be identified in the Figure 18, which is accessed through the local operation keypad and displayed on the LCD display located on the front panel. The status of converter functions is displayed in the Figure 17. Refer to Paragraph 3.3, Operation, for a description of the converter command functions.
D.2.3 C
ONVERTER
F
AULTS
Check the Monitor Status Functions Menu for possible faults, or an indication of a marginal performance tolerance condition.
D.2.3.1 P
RIME
P
OWER
Check the dual fuses on the rear panel. The required prime power is 100 to 125 Vac, or
205 to 240 Vac, at 1 amp. The optional DC prime power is -48 Vdc.
D.2.3.2 DC P
OWER
S
UPPLY
M
ODULE
15 Vdc:
A fault ("FT") indicates a voltage level exceeding
± 10% of the power supply voltage. Check the output of the DC Power Supply Module. The typical current output level is 3.0 amps. Check all connections to make sure they are secure. If the voltage exceeds ± 10%, or the power supply module current is not approximately 3.0 amps, or the fault still exists, remove the power supply and return it to Comtech EF Data for repair.
14 Vdc:
A fault ("FT") indicates a voltage level exceeding ± 10% of the power supply voltage. The 14 Vdc is developed in the modules. Check the output of the 15
Vdc Power Supply Module, check for other module faults, and check all connections. If the fault still exists, remove the converter and return it to
Comtech EF Data for repair.
VCC (+5 Vdc):
A fault ("FT") indicates a voltage level exceeding ± 10% of the power supply voltage. The 5 Vdc is developed in the modules. Check the output of the 15 Vdc
Power Supply Module, check for other module faults, and check all connections.
If the fault still exists, remove the converter and return it to Comtech EF Data for repair.
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DT4500 Series Down Converters
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MN/DT4500.IOM
Revision 1
D.2.3.3 RF C
ONVERTER
M
ODULE
IFLO LOCK DETECT:
A fault (“FT”) indicates that the IFLO is not locked. Check all connections to the converter module to make sure they are secure. If the fault still exists, remove the
Converter Module and return it to Comtech EF Data for repair.
D.2.3.4 S
YNTHESIZER
S
UM
L
OOP
M
ODULE
SUM LOOP DETECT:
A fault (“FT”) indicates that the sum loop is not locked. Check all connections to the converter module to make sure they are secure. If the fault still exists, remove the Sum Loop Module and return it to Comtech EF Data for repair.
D.2.3.5 S
YNTHESIZER
F
INE
S
TEP
M
ODULE
COARSE LOOP DETECT:
A fault (“FT”) indicates that the coarse loop is not locked. Check all connections to the converter module to make sure they are secure. If the fault still exists, remove the Fine Step Module and return it to Comtech EF Data for repair.
FINE LOOP DETECT:
A fault (“FT”) indicates that the fine loop is not locked. Check all connections to the converter module to make sure they are secure. If the fault still exists, remove the Fine Step Module and return it to Comtech EF Data for repair.
D.2.3.6 R
EFERENCE
O
SCILLATOR
M
ODULE
REFERENCE LOCK DETECT:
A fault ("FT") indicates that the reference oscillator detected an external reference, but could not lock to it. Disconnect the external reference. If the fault still exists, remove the Reference Module and return it to Comtech EF Data for repair.
D.2.3.7 T
EMPERATURE
F
AULT
CONVERTER OVER TEMPERATURE FAULT:
A fault ("FT") indicates that the converter is over temperature. Turn the prime power switch off and return the converter to Comtech EF Data for repair.
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DT4500 Series Down Converters
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MN/DT4500.IOM
Revision 1
D.2.4 C
ONVERTER
I/O M
ODULES
The Converter I/O Modules (IOM, or TSM) are installed on the rear panel of the converter. The screws holding the I/O Module to the converter chassis are installed
“hand tight”.
IMPORTANT
When installing an I/O Module “DO NOT” use a screwdriver to tighten the module mounting screws - install screws “hand tight” only.
D.3 S
PARES
Comtech EF Data recommends sparing at the RF converter level. If sparing at a lower level is desired, please contact Comtech EF Data for the correct spares for your particular converter.
89
DT4500 Series Down Converters
Maintenance and Troubleshooting
NOTES:
90
MN/DT4500.IOM
Revision 1
A
Access Methods, 59
Addresses, 60
Alarm Status, 72
Applications, 81
Application Identification, 66
Attenuator, 67
Auto Fault Recovery, 68
Automatic Configuration Verification, 50
Automatic/Manual Mode, 70
B
Backup Converter, 42
Backup Mode, 71
Baud Rate, 58, 63
Bus Inactivity Requirement, 58
C
Cable Connections, 20
Cable Connections for Non-Redundant System
23
Cable Connections for Redundant System
23
Cable Interconnect Diagram, 23
Character Set, 58
Clear All Stored Alarms, 75
Clear All Stored Faults, 38
Clear Data From Pre-Select, 37
Clear Preset, 69
Cold Start, 67
Command, 61
Command Ending, 62
Command/Response Pairs, 63
Configure Converter to Pre-Select, 37
91
Index
Configuration Commands, 66
Configuration Errors, 77
Configuration Functions Menu, 36
Configuration Menu Commands – Redundancy
29
Configuration Menu Commands – Redundancy
ON, Backup Unit Not Selected, 30
Configuration Menu Commands – Redundancy
ON and Backup Unit Selected, 31
Configuration Status, 71
Confirmation Response, 61
Converter #1 Being Backed UP, 51
Converter #1 in MANUAL, others in AUTO, 52
Converter Commands, 35
Converter Faults, 87
Converter I/O Modules, 89
Converter Operating Command Functions, 28
Converter Oscillator Faults, 37
Converter Over Temperature Fault, 38
Converter Remote Command Summary, 78
Converter Slope Adjustment, 64
Current Faults Function Menu, 37
D
Date, 63
DC Power Supply Module, 87
Detachable Modules, 42
Device Address, 61
Dimensional Envelope, 14
Direct Access, 59
Display All Presets, 68
Display Pre-Select, 36
Display Stored Faults, 38
Down Converter Switching, 42
DT-4500 Series Down Converter, 1
DT4500 Series Down Converters
Index
DT-4503 C-Band Down Converter
3
DT-4503/E C-Band Down Converter
DT-4503/X C-Band Down Converter
8
DT-4513/E Ku-Band Down Converter
Specifications, 12
DT-451X Ku-Band Down Converter
10
Dual Source 1:N Redundant Configuration with
PSM-XX and RSM-XX Installed, 47
Dual Source 1:N Redundant Configuration
Diagram with PSM-XX and RSM-XX
Installed,
E
End of Message, 62
Entry Mode/COLD Start, 36
Error Processing, 77
Error Response, 62
Equipment Type, 65
External Reference, 36
F
Fault Recovery, 36
Firmware Information, 65
Forced BU of Converter #1, 53
Format, 58
Frequency, 66
Frequency Operating Mode, 36
Front Panel, 2, 25
1:3 Front Panel Displays, 49
Front Panel Display, 16
Front Panel Test Point Samples, 16
Functional Description, 2
92
MN/DT4500.IOM
Revision 1
G
General, 57
General Errors, 77
H
High Speed Bus (HSB), 42
High Speed Bus (HSB), Connector J3, 22
I
Indirect Access, 59
Initial Configuration, 49
Installation, Operation, Maintenance, 84
Introduction, 1
K
Keypad, 27
L
LCD Brightness, 64
LCD Contrast, 64
List All Alarms, 76
M
Maintenance and Troubleshooting, 85
Maintenance Status, 72
Maintenance Testing, 86
Manual Configuration/Verification, 52
Message Structure, 61
Mode Alarms, 77
Modes, 69
Monitor & Control, 84
Monitor Status Function Menu, 37
Monitor Status Menu Commands, 32
Mute, 67
DT4500 Series Down Converters
Index
N
New in the Manual, 16
Non-Redundant Converter Configuration, 24
Non-Redundant Converter Configuration with Rx
SW Module (RSM-xx) Installed, 24
O
Offset Adjustment, 54
Operating Functions – Front Panel, 26
Operation, 27
Overview, 1, 25, 41
P
Packed Alarm Status, 75
Packed Configuration Status, 73
Packed Maintenance Status, 74
Packed Utility Status, 74
Physical Addresses, 60, 63
Physical Configuration, 15
Power Faults, 37
Pre-Select Function Menu, 36
Prime Power, 87
Prime Power Connection, 19
Prime Power Switch, 16
Program Pre-Select, 37
Program Preset, 69
Protocol, 58
R
Rack Mount Installation, 19
Rear Panel, 2, 25
Rear Panel Connections, 20
Redundancy Mode, 36, 69
Redundancy Systems – Converter Removal, 54
Redundant Configurations, 43
Redundant Configuration – Dual Source IF
46
93
MN/DT4500.IOM
Revision 1
Redundant Configuration – Single Source IF
Output w/IOM and RSM-XX Installed, 44
Redundant Configuration Diagram – Single
Source IF Output w/IOM and RSM-XX
44
1:1 Redundant Configuration Diagram – Single
Source IF Output w/IOM and TSEQM-
XX Installed, 44
1:1 Redundant Configuration Diagram – Dual
Source IF Output with IOM-XX and
RSM-XX Installed, 46
Redundant System Configuration, 49
Redundant System Operation, 41
Reference Oscillator Module, 88
Reference Oscillator Tuning, 64
Remote Control, 57
Response Ending, 62
Response Timeout, 58
RF Converter Module, 88
RF Signal Conversion, 82
RS-232, 59
RS-485, 59,
RS-485/RS-232 Interface (COM 1),
Connector 1, 21
S
Select a Preset, 69
Spares, 89
Specifications, 4
Start Character, 61
Status Commands, 71
Stored Alarm, 75
Stored Faults, 38
Stored Faults Menu Commands, 33
Summary Alarm Status, 73
Summary Fault Output (RELAY),
Connector P1, 22
Switching Power ON, 27
Synthesizer Faults, 38
DT4500 Series Down Converters
Index
Synthesizer Fine Step Module, 88
Synthesizer Sum Loop Module, 88
1:3 System in AUTO Redundant Mode, 50
System Operation, 25
T
Temperature Fault, 88
Terminal Status Change, 73
Test Point Samples, 86
Theory of Operation, 81
Time, 63
Time-Outs, 77
Total Stored Alarms, 75
Total Stored Faults, 38
Transmission Mode, 58
Troubleshooting, 87
TSEQM Connection Locations, 45
Typical Converter Functional Block Diagram, 83
Typical Functional Block Diagram, 3
U
Unpacking and Inspection, 19
Utility Commands, 63
Utility Function Menu, 39
Utility Function Menu Commands, 34
Utility Status, 72
V
Virtual Address, 60
94
MN/DT4500.IOM
Revision 1
Unit
1 centimeter
Centimeter
—
Inch
0.3937
METRIC CONVERSIONS
Foot
Units of Length
Yard Mile
0.03281 0.01094
6.214 x 10
-6
Meter Kilometer Millimeter
0.01 — —
1 inch
1 foot
2.540
30.480
1.609 x 10
—
5
—
12.0
6.336
0.03937
4
0.08333
—
5.280
—
3
0.2778
0.3333
—
10 3
1.578 x 10 -5
1.893 x 10
-4
1 yard 91.44 36.0 3.0 — 5.679 x 10 -4
1 6.214 x 10 -4
1 mile
1 mm
—
—
0.254 — 25.4
0.3048 — —
0.9144 — —
— — —
1.609 x 10 3
—
1.609 —
— —
Unit
1 gram
Unit
32
° Fahrenheit
212
° Fahrenheit
-459.6
° Fahrenheit
Gram
—
° Fahrenheit
Temperature Conversions
° Centigrade
0
—
(water freezes)
100
—
—
Ounce
Avoirdupois
(water boils)
273.1
(absolute 0)
Units of Weight
Ounce
Troy
Pound
Avoir.
0.03527 0.03215 0.002205
Formulas
C = (F - 32) * 0.555
F = (C * 1.8) + 32
Pound
Troy
0.002679
Kilogram
0.001
1 oz. avoir.
1 oz. troy
1 lb. avoir.
1 lb. Troy
1 kilogram
28.35
31.10
453.6
373.2
1.0 x 10
3
—
1.097
0.9115
—
0.0625
0.06857
0.07595
0.08333
0.02835
0.03110
16.0
13.17
14.58
12.0
—
0.8229
1.215
—
0.4536
0.3732
35.27 32.15 2.205 2.679 —
2114 West 7th Street Tempe Arizona 85281 USA
480 • 333 • 2200 Phone
480 • 333 • 2161 FAX
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Key features
- Remote Control
- Redundant Operation
- Stability
- Preset Channels
- Output Level
- Attenuation Adjust
- IF Bandwidth
- External Ref
