Motorola SG2-DRT-3X Operating instructions

STARLINE®
SG2440
Telecommunications Optical Node
Installation and Operation Manual
4
2
6
IN
7
Caution
These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that
contained in the Installation and Troubleshooting Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel.
Special Symbols That Might Appear on the Equipment
DANGER
INVISIBLE LASER RADIATION
AVOID DIRECT EXPOSURE TO BEAM
PEAK POWER 5.0mW
WAVELENGTH 1300nm
CLASS IIIb LASER PRODUCT
THIS PRODUCT COMPLIES WITH 21CFR
CHAPTER 1 SUBCHAPTER J
This is a class 1 product that contains a class IIIb laser and is intended for operation in a closed environment with
fiber attached. Do not look into the optical connector of the transmitter with power applied. Laser output is invisible,
and eye damage can result. Do not defeat safety features that prevent looking into optical connector.
This product contains a class IIIb laser and is intended for operation in a closed environment with fiber attached. Do
not look into the optical connector of the transmitter with power applied. Laser output is invisible, and eye damage
can result. Do not defeat safety features that prevent looking into optical connector.
This symbol indicates that dangerous voltage levels are present within the equipment. These voltages are not
insulated and may be of sufficient strength to cause serious bodily injury when touched. The symbol may also appear
on schematics.
The exclamation point, within an equilateral triangle, is intended to alert the user to the presence of important
installation, servicing, and operating instructions in the documents accompanying the equipment.
For continued protection against fire, replace all fuses only with fuses having the same electrical ratings marked at
the location of the fuse.
FCC Compliance
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 and, if not installed and used in accordance with the Installation Manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will
be required to correct the interference at his/her own expense. Any changes or modifications not expressly approved by Motorola could void the user’s
authority to operate this equipment under the rules and regulations of the FCC.
Canadian Compliance
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respects toutes les exigences du Règlement sur le matériel brouilleur du Canada.
Declaration of Conformity
We
Motorola, Inc.
101 Tournament Drive
Horsham, PA 19044, U.S.A.
declare under our sole responsibility that the
STARLINE®
Model SG2440
to which this declaration relates is in conformity with one or more of the following standards:
EMC Standards
EN55022
EN55024
EN50083-2
CISPR-22
CISPR-24
EN60825
EN60950
IEC 60950 + A1: 1992 + A2: 1993 + A3: 1995 + A4: 1996
Safety Standards
EN60065
following the provisions of the Directive(s) of the Council of the European Union:
EMC Directive 89/336/EEC
Low Voltage Directive 73/23/EEC
Copyright © 2002 by Motorola, Inc.
All rights reserved. No part of this publication may be reproduced in any form or by any means or used to make any derivative work (such as translation,
transformation or adaptation) without written permission from Motorola, Inc.
Motorola reserves the right to revise this publication and to make changes in content from time to time without obligation on the part of Motorola to
provide notification of such revision or change. Motorola provides this guide without warranty of any kind, either implied or expressed, including, but not
limited to, the implied warranties of merchantability and fitness for a particular purpose. Motorola may make improvements or changes in the product(s)
described in this manual at any time.
MOTOROLA, the Stylized M Logo, and STARLINE are registered in the US Patent & Trademark Office. LIFELINE is a trademark of Motorola, Inc. All other
product or service names are the property of their respective owners. © Motorola, Inc. 2002
Contents
Section 1
Introduction
Using this Manual ............................................................................................................................................................................ 1-3
Related Documentation................................................................................................................................................................... 1-3
Document Conventions................................................................................................................................................................... 1-4
If You Need Help............................................................................................................................................................................... 1-4
Calling for Repairs ........................................................................................................................................................................... 1-4
Section 2
Overview
Housing............................................................................................................................................................................................. 2-2
Mounting Holes ....................................................................................................................................................................... 2-2
Port Locations ......................................................................................................................................................................... 2-3
Gaskets .................................................................................................................................................................................... 2-4
Network Monitoring ......................................................................................................................................................................... 2-5
Options and Accessories................................................................................................................................................................ 2-5
Electronics Package ........................................................................................................................................................................ 2-6
Forward Band .......................................................................................................................................................................... 2-6
Return Band............................................................................................................................................................................. 2-7
Configuration.................................................................................................................................................................................... 2-9
Bandpass Frequencies (SG2440-*)...................................................................................................................................... 2-10
Bandpass Frequency Splits (SG2440-X*) ........................................................................................................................... 2-11
Station Tilt (SG2440-XX*)...................................................................................................................................................... 2-11
Tilt Selection .......................................................................................................................................................................... 2-11
RF Configuration (SG2440-XXX-*) ....................................................................................................................................... 2-13
Gain and Hybrid Technologies (SG2440-XXX-X*) .............................................................................................................. 2-13
Forward Path Padding .......................................................................................................................................................... 2-14
Level Control (SG2440-XXX-XX*)......................................................................................................................................... 2-15
Surge Protection and Powering Options (SG2440-XXX-XXX*) ......................................................................................... 2-15
Section 3
Bench Setup and Operation
Forward Path Configuration............................................................................................................................................................ 3-2
Standard Forward.................................................................................................................................................................... 3-3
Standard Forward Redundant................................................................................................................................................ 3-5
Forward Segmented................................................................................................................................................................ 3-7
Frequency Band Split and Frequency Band Split with Redundancy................................................................................. 3-9
Return Path Configuration ............................................................................................................................................................ 3-11
SG2440 Installation and Operation Manual
ii
Contents
Single Combined and Redundant Single Combined Return.............................................................................................3-12
Split Return with Analog and 1X Digital Transmitters .......................................................................................................3-14
Split Return with a 2X TDM Digital Transmitter ..................................................................................................................3-15
Split Redundant Return with 2X Digital Transmitters ........................................................................................................3-17
Segmented Return with 2X Digital Transmitters ................................................................................................................3-19
Powering the Node .........................................................................................................................................................................3-21
Power Supply Settings..........................................................................................................................................................3-23
Single Power Supply or Commonly Powered Redundant Supplies.................................................................................3-24
Individually Powered Supplies.............................................................................................................................................3-24
Manual Gain Control and Thermal Control ..................................................................................................................................3-25
Manual Gain Control..............................................................................................................................................................3-25
Thermal Control, Model TCU ................................................................................................................................................3-25
Section 4
Optical Modules
SG2440 Optical Modules..................................................................................................................................................................4-1
Installing SG2440 Optical Modules........................................................................................................................................4-1
Removing SG2440 Optical Modules ......................................................................................................................................4-2
Cleaning the Optical Connector .............................................................................................................................................4-2
SG2-R/* Optical Receiver .................................................................................................................................................................4-3
SG2-FPT Optical Transmitter ..........................................................................................................................................................4-7
SG2-EIFPT Optical Transmitter .......................................................................................................................................................4-8
SG2-DFBT Optical Transmitter........................................................................................................................................................4-9
SG2-DFBT/3 Optical Transmitter...................................................................................................................................................4-10
DS-SG2-DRT/A Digital Return Transmitter...................................................................................................................................4-11
DS-SG2-DRT-2X/A Digital Return Transmitter.............................................................................................................................4-13
Status Monitoring ...........................................................................................................................................................................4-16
Manual Control Board ....................................................................................................................................................................4-17
Ingress Control ...............................................................................................................................................................................4-19
Section 5
Installation
Splicing Fiber....................................................................................................................................................................................5-1
Strand Wire Mounting ......................................................................................................................................................................5-3
Coaxial Cables ..................................................................................................................................................................................5-5
Fiber Cables ......................................................................................................................................................................................5-5
SG2440 Installation and Operation Manual
Contents
iii
Appendix A
Specifications
Appendix B
Torque Specifications
Abbreviations and Acronyms
Figures
Figure 1-1 SG2440 — closed.......................................................................................................................................................... 1-1
Figure 1-2 SG2440 — open............................................................................................................................................................. 1-2
Figure 2-1 SG2440 housing dimensions — front and side view ................................................................................................ 2-2
Figure 2-2 Housing port locations................................................................................................................................................. 2-3
Figure 2-3 Housing gaskets ........................................................................................................................................................... 2-4
Figure 2-4 Signal flow diagram...................................................................................................................................................... 2-8
Figure 2-5 Configuration notation ................................................................................................................................................. 2-9
Figure 2-6 Forward bandpass-specific components................................................................................................................. 2-10
Figure 2-7 Relative level dB versus 750 MHz slope................................................................................................................... 2-12
Figure 2-8 Relative level dB versus 870 MHz slope.................................................................................................................... 2-12
Figure 2-9 Optical input versus RF output ................................................................................................................................. 2-13
Figure 2-10 SG2-PS power supply .............................................................................................................................................. 2-16
Figure 3-1 SG2440 RF chassis and major components.............................................................................................................. 3-1
Figure 3-2 SG2440 lid showing major forward-path components ............................................................................................. 3-2
Figure 3-3 Standard forward configuration block diagram ........................................................................................................ 3-3
Figure 3-4 Standard-forward, single-receiver board ................................................................................................................... 3-4
Figure 3-5 Standard forward-redundant configuration block diagram...................................................................................... 3-5
Figure 3-6 Standard forward-redundant board ............................................................................................................................ 3-5
Figure 3-7 JP2 jumper..................................................................................................................................................................... 3-6
Figure 3-8 Forward-segmented, two-receiver configuration block diagram ............................................................................ 3-7
Figure 3-9 Forward segmented board........................................................................................................................................... 3-7
Figure 3-10 Frequency band split block diagram ........................................................................................................................ 3-9
Figure 3-11 Frequency band split board....................................................................................................................................... 3-9
Figure 3-12 SG2440 lid showing major return-path components ............................................................................................ 3-11
Figure 3-13 Single combined return, redundant option configuration block diagram .......................................................... 3-12
Figure 3-14 Single return with redundant option board............................................................................................................ 3-13
Figure 3-15 Split return configuration block diagram ............................................................................................................... 3-14
Figure 3-16 Split return board...................................................................................................................................................... 3-14
Figure 3-17 DS-SG2-DRT-2X/A cable connector........................................................................................................................ 3-15
SG2440 Installation and Operation Manual
iv
Contents
Figure 3-18 DS-SG2-DRT-2X/A cable connector ........................................................................................................................3-16
Figure 3-19 Split return with redundancy configuration block diagram..................................................................................3-17
Figure 3-20 Split return with redundancy board ........................................................................................................................3-17
Figure 3-21 Split return with redundancy option – configuration and cabling .......................................................................3-18
Figure 3-22 Segmented return configuration .............................................................................................................................3-19
Figure 3-23 Segmented return board...........................................................................................................................................3-19
Figure 3-24 Fuse locations ...........................................................................................................................................................3-21
Figure 3-25 Fuse configuration....................................................................................................................................................3-22
Figure 3-26 SG2-PS power supply...............................................................................................................................................3-23
Figure 3-27 JP1 common-powered single or redundant power configuration .......................................................................3-24
Figure 3-28 JP1 split-powered redundant power supply configuration ..................................................................................3-24
Figure 4-1 SG2-R/* block diagram..................................................................................................................................................4-3
Figure 4-2 SG2-R/* ...........................................................................................................................................................................4-4
Figure 4-3 Wavelength selection jumper.......................................................................................................................................4-5
Figure 4-4 Test-point voltage versus optical power ....................................................................................................................4-6
Figure 4-5 SG2-FPT .........................................................................................................................................................................4-7
Figure 4-6 SG2-EIFPT......................................................................................................................................................................4-8
Figure 4-7 SG2-DFBT ......................................................................................................................................................................4-9
Figure 4-8 SG2-DFBT/3 .................................................................................................................................................................4-10
Figure 4-9 DS-SG2-DRT/A.............................................................................................................................................................4-11
Figure 4-10 DS-SG2-DRT/A...........................................................................................................................................................4-11
Figure 4-11 DS-SG2-DRT-2X/A .....................................................................................................................................................4-13
Figure 4-12 DS-SG2-DRT-2X/A .....................................................................................................................................................4-13
Figure 4-13 DS-SG2-DRT-2X/A installed in SG2440 ...................................................................................................................4-15
Figure 4-14 MCB board .................................................................................................................................................................4-18
Figure 5-1 Service cable connection and compression fitting ...................................................................................................5-1
Figure 5-2 Mounting bracket-front view ........................................................................................................................................5-3
Figure 5-3 Mounting bracket-rear and side views........................................................................................................................5-4
Figure 5-4 Center conductor length...............................................................................................................................................5-5
Figure 5-5 Housing lid and fiber spool tray ..................................................................................................................................5-6
Figure 5-6 Fiber spool tray .............................................................................................................................................................5-6
Tables
Table 2-1 Options and accessories ...............................................................................................................................................2-5
Table 2-2 SG2440 pad chart-standard gain.................................................................................................................................2-14
Table 3-1 AC fuses..........................................................................................................................................................................3-23
Table 4-1 SG2-R/* features..............................................................................................................................................................4-4
Table 4-2 SG2-R/* minimum output levels ....................................................................................................................................4-5
Table 4-3 SG2-FPT features............................................................................................................................................................4-7
SG2440 Installation and Operation Manual
Contents
v
Table 4-4 SG2-EIFPT features........................................................................................................................................................ 4-8
Table 4-5 SG2-DFBT features ........................................................................................................................................................ 4-9
Table 4-6 SG2-DFBT/3 features ................................................................................................................................................... 4-10
Table 4-7 DS-SG2-DRT/A features............................................................................................................................................... 4-12
Table 4-8 DS-SG2-DRT-2X/A features ......................................................................................................................................... 4-14
Table 4-9 Reporting and control provisions............................................................................................................................... 4-16
Table 4-10 MCB user-interface settings...................................................................................................................................... 4-17
Table A-1 SG2440 optical receiver characteristics......................................................................................................................A-1
Table A-2 Station RF characteristics ............................................................................................................................................A-1
Table A-3 SG2440 general characteristics ...................................................................................................................................A-2
Table A-4 Current requirements ....................................................................................................................................................A-2
Table A-5 SG2440 performance, with 77 channels......................................................................................................................A-2
Table A-6 SG2-FPT RF specifications...........................................................................................................................................A-3
Table A-7 SG2-DFBT RF specifications ........................................................................................................................................A-3
Table A-8 SG2-DFBT/3 RF specifications .....................................................................................................................................A-3
Table A-9 SG2-EIFPT RF specifications .......................................................................................................................................A-4
Table A-10 SG2-DRT/A RF specifications.....................................................................................................................................A-4
Table A-11 SG2-DRT-2X/A RF specifications...............................................................................................................................A-5
Table A-12 Optical output power vs. wavelength for DS-SG2-DRT*/A transmitters ................................................................A-5
SG2440 Installation and Operation Manual
Section 1
Introduction
®
Motorola’s STARLINE SG2440 scaleable optical node is the successor to the popular fouroutput SG2000 platform. The optical node performs light wave-to-RF and RF-to-light wave
signal conversions in an optical transmission link. The SG2440 enables the system operator to
independently and incrementally segment the downstream and upstream sections of the node
without discarding the initial platform. This product is designed to support a wide variety of
advanced hybrid-fiber/coaxial network topologies.
As broadband communication systems continue to evolve, the demand increases for optical links
that carry the signal further into the transport system. These systems require additional
features and functionality such as digital compression and alternate access at significantly lower
costs. Fully configured, the SG2440 supports these next-generation telecommunication
networks. It also supports a variety of single and two-way broadband network applications such
as broadcast video, interactive video, telephony, and data.
Figure 1-1 illustrates a closed SG2440 telecommunications optical node:
Figure 1-1
SG2440 — closed
6
2
4
7
8
3
1
5
SG2440 Installation and Operation Manual
1-2
Introduction
Figure 1-2 illustrates an open SG2440 telecommunications optical node:
Figure 1-2
SG2440 — open
STATUS
MONITOR
-20dB
-20dB
PORT
1
H
PORT
2
H
FWD EQ
FWD EQ
JXP
L
L
JXP
JXP
JXP
SG2440-
-20dB
-20dB
CAUT ION:
CONT AINS PART S
AND ASSEMBL IES
SUSCEPT IBL E TO
I
C
S
FTEC
DAM AGE BY
ELECT ROSTAT IC
L
P
F
DISCHARGE ( ESD )
STATUS
MONITOR
L
P
F
I
C
S
FTEC
RP2
RP1
STATUS MONITOR
-20dB
REF ER TO
M ANUAL F OR
F USE VAL UES
JXP
JXP
-20dB
JXP
RESP
I
C
S
L
P
F
RESP
L
P
F
RP4
RP3
PORT
3
FP1
INP UT
MAN
FP2
INP UT
I
C
S
JXP
L
TCU
H
MAN
FWD EQ
+5V
+24V
FWD EQ
PORT
4
L
H
AUTO
-20dB
-20dB
EM BLED IN MEXICO
Base
Lid
SG2440 features include:
Standard, redundant, segmented, and frequency band split with redundant option for
750 MHz and 870 MHz forward passband using up to three optical receivers
Single, redundant, and split standard 40 MHz return using up to two analog or 1X digital
return optical transmitters.
Split, split redundant, and segmented standard 40 MHz return passband using up to two 2X
digital return optical transmitters
Four independent RF outputs
Ingress switching capability through manual or headend control
Redundant powering capability without the need for additional interconnect cable
15 Amp power passing
SG2440 Installation and Operation Manual
Introduction
1-3
™
Optional LIFELINE status monitoring
User-friendly fiber management
60/90 volt, 50/60 MHz powering with split powering feature
Digital return capability
Modular plug-in diplex filters and equalizers
Custom configuration for unique system requirements
Using this Manual
The following sections provide information and instructions to install, configure, and operate the
SG2440:
Section 1
Introduction provides a brief description of the product, identifies the information contained
in this manual, and gives the help line telephone number and repair return information.
Section 2
Overview provides a list of the options and accessories, housing, and configuration
information for the SG2440. It also discusses the multiple receiver and transmitter
combinations available to meet split band or redundancy requirements. Configuration of the
node begins in this section and is completed in Section 3. Basic station options are
presented in the same sequence as they appear in the configured model number.
Section 3
Bench Setup and Operation provides instructions to complete configuration of the node
and set-up the options. It also describes the bench testing procedures that are
recommended before installation. Operational information governing the use of various
options and applications required by your system is also presented.
Section 4
Optical Modules provides detailed information on the features and use of forward and
return optical modules. It also provides information regarding their installation, removal, and
cleaning of the optical connectors.
Section 5
Installation provides instructions for installing the SG2440 in a distribution system.
Appendix A
Specifications provide technical specifications for the SG2440 node and major options.
Appendix B
Torque Specifications provides the appropriate torque specifications for the screws,
clamps, connectors, and bolts used in the SG2440.
Abbreviations
and Acronyms
The Abbreviations and Acronyms list contains the full spelling of the short forms used in
this manual.
Related Documentation
Although these documents provide information that may be of interest to you, they are not
required to install or operate the SG2440.
LL-CU LIFELINE Control Unit Installation and Operation Manual
LIFELINE for Windows Site Preparation Guide
LIFELINE for Windows Software Operations Manual
Return Path Level Selection, Setup, and Alignment Procedure Reference Guide
SG2440 Installation and Operation Manual
1-4
Introduction
Document Conventions
Before you begin to use the SG2440, familiarize yourself with the stylistic conventions used in
this manual:
Bold type
Indicates text that you must type exactly as it appears or indicates a default value
SMALL CAPS
Denotes silk screening on the equipment, typically representing front and rear-panel
controls, I/O connections and indicators (LEDs).
* (Asterisk)
Indicates that there are several versions of the same model number and the information
applies to all models. When the information applies to a specific model, the complete
model number is given.
Italic type
Denotes a displayed variable, a variable that you must type, or is used for emphasis
If You Need Help
If you need assistance while working with the SG2440, contact the Motorola Technical Response
Center (TRC):
Inside the U.S.: 1-888-944-HELP (1-888-944-4357)
Outside the U.S.: 215-323-0044
Online: http://www.motorola.com/broadband, click HTML/Modem Version, click
Customer Support, then click Web Support.
The TRC is open from 8:00 AM to 7:00 PM Eastern Time, Monday through Friday and 10:00 AM
to 6:00 PM Eastern Time, Saturday. When the TRC is closed, emergency service only is
available on a call-back basis. Web Support offers a searchable solutions database, technical
documentation, and low priority issue creation/tracking 24 hours per day, 7 days per week.
Calling for Repairs
If repair is necessary, call the Motorola Repair Facility at 1-800-642-0442 for a Return for
Service Authorization (RSA) number before sending the unit. The RSA number must be
prominently displayed on all equipment cartons. The Repair Facility is open from 7:00 AM to
4:00 PM Pacific Time, Monday through Friday.
When calling from outside the United States, use the appropriate international access code, and
then call 52-631-311-1100 to contact the Repair Facility.
When shipping equipment for repair, follow these steps:
1
Pack the unit securely.
2
Enclose a note describing the exact problem.
3
Enclose a copy of the invoice that verifies the warranty status.
SG2440 Installation and Operation Manual
Introduction
4
1-5
Ship the unit PREPAID to the following address:
Motorola, Inc.
Broadband Communications Sector
c/o Excel
Attn: RSA #_________
6908 East Century Park Drive
Suite 100
Tucson, AZ 85706
SG2440 Installation and Operation Manual
Section 2
Overview
The SG2440 is a major upgrade of the capabilities of the SG2000 telecommunications optical
node. It includes the development of a new electronics package, lid motherboard, and broadcast
receiver.
This section provides an overview of the multiple receiver and transmitter combinations
available to satisfy split band or redundancy requirements. It also presents and describes the
configuration options in the same sequence as they are appear in the configuration notation.
To accommodate unique system criteria, the SG2440 is shipped as a configured product.
Hundreds of variations are available with configurations designed to address numerous system
requirements that include:
Forward bandwidth to 750 MHz or 870 MHz
Band splits S, J, A, K, E, and M
Forward slope options A, B, L, M, H, and U
Silicon technology with thermal RF output level control
Surge protection for split powering schemes
Multiple forward and return path options
Optional hardware features include:
Analog and digital return transmitter options
Service cable with six or eight fibers
SC/APC or FC/APC optical connectors
Network monitoring
Ingress switching
SG2440 Installation and Operation Manual
2-2
Overview
Housing
The SG2440 optical node is furnished in an aluminum housing that protects the electronics from
weather and dissipates internally generated heat.
Figure 2-1 illustrates the SG2440 housing and provides its dimensions:
Figure 2-1
SG2440 housing dimensions — front and side view
2
4
OUT
6
12.25
8
3
4
7
3
1
21.60
5
10.99
Coaxial cable connections to the housing are made using conventional 5/8 inch × 24 threads per
inch, stinger-type connectors. For strand mounting, the optional bracket must be used. If the
node is configured for strand mounting, the bracket is installed on the node at the factory. The
bracket provides two clamps, located 16 and 7/8 inches apart, that secure the strand with
5/16 × 20 stainless steel bolts.
Mounting Holes
Two threaded holes are located on the horizontal center-line on the rear of the housing. These
5/16 × 18 × 3/4 holes are separated by eleven inches center-to-center and can be used for
pedestal or surface mounting.
SG2440 Installation and Operation Manual
Overview
2-3
Port Locations
Six housing ports provide connection for coaxial cables. Housing Port 2 and Port 4 are used only
for connection to an external 60 Vac or 90 Vac power supply. Side-by-side connector fittings are
limited to .750 inches at ports one and two and/or ports three and four. All ports are protected
by factory-inserted threaded plugs or plastic cap plugs. Discard these plugs when you install the
cable connectors.
Figure 2-2 illustrates the housing port locations:
Figure 2-2
Housing port locations
6
2
4
7
8
OUT
Lid
5
Port 2
4
1
Port 3
2
ac port
IN
Port 1
1
ac port
3
3
Port 4
Options:
Second connector
Bulkhead “F” connector
Fiber connector
Standard fiber entry
SG2440 Installation and Operation Manual
2-4
Overview
Gaskets
Each housing is equipped with a woven-wire RF gasket and a silicone-rubber gasket to provide a
seal between the housing base and lid. These gaskets provide efficient ground continuity, RF
shielding, and weather protection. Both gaskets must be in place and in good condition to
ensure proper operation and protection of the station. The weather gasket should be lightly
coated with silicone grease each time the node is opened. Replace this gasket if it becomes
damaged or deformed.
Figure 2-3 illustrates the housing gaskets:
Figure 2-3
Housing gaskets
Weather gasket
(silicone rubber)
STATUS
MONITOR
-20dB
-20dB
PORT
1
H
PORT
2
H
FWD EQ
FWD EQ
JXP
L
L
JXP
JXP
JXP
SG2440-
-20dB
CAUT ION:
-20dB
CONT AINS PART S
AND ASSEMBL IES
SUSCEPT IBL E TO
I
C
S
FTEC
DAM AGE BY
ELECT ROSTAT IC
DISCHARGE ( ESD )
STATUS
MONITOR
L
P
F
L
P
F
RP1
I
C
S
FTEC
RP2
STATUS MONITOR
-20dB
REF ER TO
M ANUAL F OR
F USE VAL UES
JXP
JXP
-20dB
JXP
RESP
I
C
S
L
P
F
RESP
L
P
F
RP4
RP3
PORT
3
FP1
INP UT
MAN
FP2
INP UT
I
C
S
JXP
L
TCU
H
MAN
FWD EQ
+5V
FWD EQ
+24V
PORT
4
L
H
AUTO
-20dB
-20dB
EM BLED IN MEXICO
RF gasket
(woven wire)
SG2440 Installation and Operation Manual
Overview
2-5
Network Monitoring
The optional LIFELINE Status Monitoring System enables you to monitor the SG2440 from a
headend or a remote location. The transponder (LL-SG2) consists of a plug-in module mounted
on the main RF board. If you do not employ status monitoring and use redundant receivers
and/or transmitters, a manual control board (MCB) occupies the same position on the main RF
board.
The entire LIFELINE system includes:
LL-CU control units
Are connected to the system at the headend and interrogate each SG2440 field
transponder with FM outbound and inbound transmissions. A variety of outbound
and inbound frequencies can be selected depending on the configuration of the
system. The control unit reports this information to the status monitor computer.
Status Monitor
Computer and Software
Includes an IBM-compatible computer that is connected to the control unit (CU)
through an RS-232 link. LIFELINE software enables the operator to view
measurements taken by the transponders.
LL-SG2-* Field Installed
Transponders
Installed in individual field components, this unit interfaces with the CU at the
headend. It reports such parameters as: forward amplifier dc current draw, ac
and dc voltage, temperature, automatic drive unit (ADU-*) drive voltage,
management and control of RF ingress switching, and tamper status.
Options and Accessories
Table 2-1 provides a list of options and accessories for the SG2440:
Table 2-1
Options and accessories
Model
Description
Function
TCU
Thermal control
unit
The TCU controls amplifier gain for changes in hybrid gain at the
sensed temperature.
JXP-*A
Fixed attenuator
Attenuator pads are used to adjust amplifier levels and are available
in 1 dB steps from 1 through 24 dB. The appropriate value must be
installed.
JXP-ZX
0 dB attenuator
This attenuator is used in place of JXP-*A pads when no attenuation
is needed.
FTEC
Crowbar
overvoltage
protection
The FTEC is an electronic crowbar/surge protector that can be used
to replace the existing 230 volt gas discharge surge protector.
LL-SG2
LIFELINE
module
This mopdule enables the system operator to monitor the SG2440
from a remote location. See Section 3 “Bench Setup and Operation”
for parameters monitored. Several frequencies are available. See the
product catalog for additional information.
GFAL
Test probe
This probe is used to evaluate node performance.
F/JXP
Injection probe
This probe is used to inject a signal for test purposes.
SG2-MCB
Manual control
board
This board locally controls the ingress switch and receiver/transmitter
A/B redundant switching if the node is not equipped with status
monitoring.
SG2-SB/*
Strand bracket
Bracket for hanging a strand mounted node.
SG2440 Installation and Operation Manual
2-6
Overview
Model
Description
Function
SG2-PS
Power supply
Provides the +24 V and +5 V dc supply to the station. It has an
extended voltage range and is power-factor corrected.
SG2SERCAB/*
Service cable
A 6- or 8-fiber service cable that is available with SC/APC or FC/APC
connectors.
SG2-LME*/750
Forward
equalizers
Used to increase output tilt of RF ports in a 750 MHz system. They
are available in 1 dB increments from 2 dB through 8 dB.
SG2-LME*/870
Forward
equalizers
Used to increase output tilt of RF ports in an 870 MHz system. They
are available in 1 dB increments from 2 dB through 8 dB.
SG2-IS
Ingress switch
This switch enables the operator to troubleshoot without shutting
down the return path. It requires the use of either the LL-SG2/* or the
SG2-MCB.
SG2-R/*
Lightwave
receiver
This receiver converts the received optical signal to broadband RF.
SG2-*
Analog return
transmitters
Refer to the list provided in Section 4, “Optical Modules.”
DS-SG2-DRT*
Digital return
transmitter
Refer to the list provided in Section 4, “Optical Modules.”
Electronics Package
The electronics package (E-pack) is divided into two pairs of RF outputs that can be driven by
multiple combinations of receivers, transmitters, and plug-in configuration boards.
Forward Band
Forward band configurations utilize up to three optical receivers in the following combinations:
Standard
Four common RF outputs are served by a single SG2-R/* receiver.
Standard, redundant
Four common RF outputs are served by either of two SG2-R/* receivers.
Segmented
Two SG2-R/*receivers each drive one pair of RF outputs.
Frequency band split
(2 SG2-R/* receivers)
Four common RF broadcast outputs are served by one SG2-R/* receiver.
Four common RF narrowcast outputs are served by one SG2-R/* receiver
Frequency band split
redundant
(3 SG2-R/* receivers)
Four common broadcast RF outputs are served by one SG2-R/* receiver.
Four common narrowcast RF outputs are served by either remaining SG2-R/*
receiver.
Additional configurations are possible with the dual narrowcast receiver that supplies digital
narrowcast signals to two ports independent of the forward configuration boards.
SG2440 Installation and Operation Manual
Overview
2-7
Return Band
Return band configurations utilize up to two optical transmitters in the following combinations:
Analog or 1X digital
Single
Single redundant
Split
All four RF returns are combined and are input to a single return transmitter.
All four RF returns are combined and are input to two return transmitters.
Each pair of RF returns are combined and are input to separate return
transmitters.
Digital 2X TDM
Split
Split redundant
Segmented
Each pair of RF returns are input to a single 2X time division multiplexing (TDM)
digital transmitter.
Each pair of RF returns are input to two 2X TDM digital transmitters.
Each RF return is input separately to two 2X TDM digital transmitters.
SG2440 Installation and Operation Manual
2-8
Overview
Figure 2-4 provides a diagram of the signal flow-path through the SG2440:
Figure 2-4
Signal flow diagram
Temp
sensor
TC curve
generator
Lid
Driver
E-pack
TP
-1.0
dB (-20 dB)
16.2 dBmV at -3 dBmV input 1550 nm,
4% peak OMI per channel
FP 1
Optical input
(-3 dBm to +2 dBm)
TP
(-20 dB)
TC
C
-4 dB
JXP
SG2-R
Optical input
(-3 dBm to +2 dBm)
-0.5 dB
0.0 dB -0.6 dB
B
Optical input
(-3 dBm to +2 dBm)
A
FEQ
H
JXP
-1.5 dB
JXP
27 dB
-4.0 dB
TP
(-20 dB)
FEQ
-0.75 dB 20.5 dB
-0.75 dB 20.5 dB
Slope
0.0 dB -0.6 dB
0.0 dB -0.6 dB
JXP
FEQ
Parasitics
-1.4 dB
-4 dB
-1.0 dB
-0.5 dB
Port 1 power
TP
-1.0
dB (-20 dB)
JXP
SG2-R or dual receiver
-1.0 dB
0.0 dB
Port 1
L
-0.5
dB
FEQ
-4
-4 dB
dB
FP 2
TC
JXP
-0.75 dB 20.5 dB
-0.75 dB 20.5 dB
27 dB
JXP
SG2-R or dual receiver
-4.0 dB
Slope
-4 dB
TP
(-20 dB)
TC
-1.5 dB
H
-1.0 dB
-1.0 dB
0.0 dB
Port 3
L
-0.5
dB
-1.0 dB
-0.5 dB
Port 3 power
TP
SM (-20 dB)
FWD
INJ.
-0.5 dB
Forward configurations
Return configurations
-1.0
dB
TP
(-20 dB)
-4 dB
JXP
-0.3
dB
Tx
A
DRT 1
-2.0 dB
Port 2
-4 dB
L
-4 dB
-0.5
dB
TP
(-20 dB)
-0.3
dB
Port 2 power
RP1
2.5 dB
SM
LPF
-2 dB
0.0 dB
ICS
JXP
-4 dB
JXP
-0.3
dB
-2.0 dB
-4 dB
RP3
-4 dB
2.5 dB
-2 dB
0.0 dB
LPF
ICS
JXP
RP2
JXP
-2.0 dB
15 dBmV nominal total input power
at the transmitter RF input port.
Retain electrical and mechanical
interface compatibility with SG2
optical transmitter modules
SG2440 Installation and Operation Manual
2.5 dB -2 dB
LPF
ICS
RP4
H
-1.0 dB
0.0 dB
Port 4
L
0.0 dB
JXP
TP
(-20 dB)
-0.3 dB
-8 dB
-1.0
TP
dB (-20 dB)
-0.3 dB
TP
(-20 dB)
TP
(-20 dB)
-0.3
dB
TP
(-20 dB)
-0.3 dB
-0.3 dB
DRT 2
2X TDMA
transmitter
TP
(-20 dB)
-2.0 dB
TP
(-20 dB)
Tx
B
-1.0 dB
-0.5 dB
-4 dB
JXP
2X TDMA
transmitter
-1.0 dB
0.0 dB
H
-4 dB
2.5 dB
-2 dB
0.0 dB
LPF
ICS
JXP
-0.3 dB
-0.5
dB
-1.0 dB
-0.5 dB
Port 4 power
+47 dBmV virtual output at each port
at 870 MHz, -3 dBm input, 1550 nm,
4% peak OMI per channel, with 904’s.
28 dBmV total return input power
(all ports combined) for low band return
power diplexer loss is 0.5 dB.
Overview
2-9
Configuration
You can order the SG2440 in a number of configurations to suit system requirements. The
shipped configuration is noted in a label on the RF chassis cover. Figure 2-5 illustrates a sample
model using the configuration notation:
Figure 2-5
Configuration notation
Key 1
Bandpass
75
87
Kex 3
750 MHz
870 MHz
Key 2
Bandpass Split
S
5-40 MHz/52-870 MHz
J
5-55 MHz/70-870 MHz
5-65 MHz/85-870 MHz
A
6 dB
8 dB
L
S
10 dB
12.5 dB
H
U
14 dB
16 dB
Key 5
S
G
Hybrid Technology
Silicon
GaAs
5-42 MHz/54-870 MHz
5-30 MHz/47-870 MHz
Key 4
M*
5-80 MHz/108-870 MHz
D
Key 10
Digital Return Path transmitters*
X
No Transmitter
01
DS-SG2-DRT-2x/A-1310-FP/SC
02
DS-SG2-DRT-2x/A-1310-DFB/SC
Key 6
Control
03
DS-SG2-DRT-2x/A-1550-DFB/SC
T
Thermal Compensation
Unit (TCU)
04
DS-SG2-DRT-2x/A-1510c-DFB/SC
05
DS-SG2-DRT-2x/A-1530c-DFB/SC
06
DS-SG2-DRT-2x/A-1550c-DFB/SC
07
DS-SG2-DRT-2x/A-1570c-DFB/SC
DS-SG2-DRT-2x/A-1470c-DFB/SC
Key 7
X
K
E
Key 8
Tilt
A
B
RF Configurations
4 Bridger
Surge Protection
Surge Arrestors
F
1 FTEC Crowbar
30
19
G
2 FTEC Crowbars for
dual ac powering
20
21
No. of
receivers
Forward Path Configuration, including required SG2/R receiver(s)
DS-SG2-DRT-2x/A-1490c-DFB/SC
DS-SG2-DRT-2x/A-1590c-DFB/SC
DS-SG2-DRT-2x/A-1610c-DFB/SC
10
11
DS-SG2-DRT/A-1310-FP/SC
DS-SG2-DRT/A-1310-DFB/SC
12
DS-SG2-DRT/A-1550-DFB/SC
13
DS-SG2-DRT/A-1510c-DFB/SC
14
DS-SG2-DRT/A-1530c-DFB/SC
DS-SG2-DRT/A-1550c-DFB/SC
N
None; available only when “E-pack Only” option is selected; no receiver
0
X
Standard forward board; used with a single receiver to provide 4 common RF outputs
15
A
Redundant standard forward board; used with 2 receivers to provide 4 common RF outputs
1
2
16
DS-SG2-DRT/A-1570c-DFB/SC
B
Forward segment board; used with 2 receivers, each receiver drives a pair of RF outputs
2
D
Frequency band split (450 MHz); 2 receivers; 1 broadcast; 1 narrowcast above 450 MHz,
combine to provide 4 common RF outputs
2
22
23
DS-SG2-DRT/A-1470c-DFB/SC
DS-SG2-DRT/A-1490c-DFB/SC
24
E
Frequency band split (450 MHz) with redundant narrowcast; 3 receivers; 1 broadcast; 2 narrowcast
above 450 MHz, combine to provide 4 common RF outputs, requires s/m or MCB
3
DS-SG2-DRT/A-1590c-DFB/SC
DS-SG2-DRT/A-1610c-DFB/SC
Key 9
25
Return Path Configuration, does not include transmitters
X
None
A
Single combined return; 1 analog or 1X digital transmitter
B
Redundant single combined return; 2 analog or 2 1X digital transmitters of the same wavelength
C
Redundant single combined return; 2 1X digital transmitters with adjacent wavelengths
D
Split return; 2 analog or 2 1X digital transmitters of the same wavelength
E
F
Key 10
Digital Return Adjacent Wavelength pairs*
Split return; 2 1X digital transmitters with adjacent wavelengths
08
09
26
DS-SG2-DRT-2x/A-1510c and 1530c-DFB/SC
DS-SG2-DRT-2x/A-1550c and 1570c-DFB/SC
DS-SG2-DRT-2x/A-1470c and 1490c-DFB/SC
G
Split return; 1 2X TDM digital transmitter
Split redundant return; 2 2X TDM digital transmitters of the same wavelengths
27
17
DS-SG2-DRT-2x/A-1590c and 1610c-DFB/SC
DS-SG2-DRT/A-1510c and 1530c-DFB/SC
H
Split redundant return; 2 2X TDM digital transmitters with adjacent wavelengths
18
DS-SG2-DRT/A-1550c and 1570c-DFB/SC
J
4 separate returns; 2 2X TDM only with the same wavelengths
DS-SG2-DRT/A-1470c and 1490c-DFB/SC
K
4 separate returns; 2 2X TDM only with adjacent wavelengths
28
29
SG2440
1
2
3
4
Key 11 Analog Return Path Transmitters
5
6
7
8
9
10
11
Key 13
12
13
14
Service Cable
None
X
B
No Transmitter
SG2-DFBT/* (1mW)
X
06
C
D
SG2-DFBT3/* (2 mW)
SG2-FPT/* (0.4 mW)
08
8 Fiber Service Cable,
SC/APC only
E
SG2-EIFPT/* (1 mW)
Kex 14
Status Monitoring
Key 12
Connectorization
S
SC/APC
F
FC/APC
15
16
DS-SG2-DRT/A-1590c and 1610c-DFB/SC
17
18
X*
X*
Key 16
6 Fiber Service Cable
J
M
Kex 15
X
B
None
LL-AM-SG2 Freq Agile
LL-TG-SG2 Freq Agile
MCB w/SIC
Ingress Switch
None
Ingress switch
X*
X*
X*
Power Supply
N
X
None; E-pack only
Single
D
Dual
Key 17
X
H
X*
Housing Assembly & Finish
X
C
Standard, none
Standard, Chromate
E
Electronic Pack only
F
Housing lid w/ 2 fiber entries;
add/drop port option
G
Housing lid w/ 2 fiber entries;
add/drop port option; Chromate
Key 18
Mounting
N
None; E-pack only
X
Pedestal
Y
Strand
Key X* Reserved
X*
Reserved
Refer to the current Motorola catalog for option and feature availability.
SG2440 Installation and Operation Manual
2-10
Overview
The following subsections present the options in the same left-to-right sequence as the
construction of the configurator illustrated in Figure 2-5. Configuration of the SG2440 node
continues in Section 3, “Bench Setup and Operation.”
Bandpass Frequencies (SG2440-*)
The SG2440 scaleable optical node is available in forward bandpass frequencies of 750 MHz and
870 MHz. The frequency bandpass can be determined by reading the first two digits following
the model number, SG2440-75 (750 MHz) or SG2440-87 (870 MHz).
Key 1
Bandpass
75
750 MHz
87
870 MHz
Components that are forward bandpass specific include the SDR-* flatness board, active hybrids
and Linear Mid-stage Equalizers (LME’s). The SDR-* circuit board provides a fixed linear
equalizer for either 750 MHz or 870 MHz. The SDR-* board also compensates for the low
frequency roll-off inherent in plug-in diplex filters (DF). The SG2-R optical receiver forward
bandpass is 870 MHz. There are no limitations on forward frequencies passed on the lid
motherboard, however, there are forward-path plug-in configuration boards that perform
frequency band split functions that are explained later.
Figure 2-6 illustrates the location of forward bandpass-specific components on the RF amplifier:
Figure 2-6
Forward bandpass-specific components
RPLPF-V-*
Diplex
filter
Diplex
filter
RPLPF-V-*
LME
RPLPF-V-*
SG2440 Installation and Operation Manual
LME
SDR*
Diplex
filter
LME
LME
SDR*
Diplex
filter
RPLPF-V-*
Overview
2-11
Bandpass Frequency Splits (SG2440-X*)
The SG2440 is configured with sufficient frequency bandsplits to accommodate global
requirements. The bandpass split can be determined from the model number on the RF chassis
cover as indicated in the chart below:
Key 2
Bandpass Split (MHz)
S
5-40/52-870
J
5-55/70-870
A
5-65/85-870
K
5-42/54-870
E
5-30/47-870
M
5-80/108-870
Components that determine the bandpass frequency splits include the plug-in diplex filters and
the vertical return-path low pass filters (RPLPF-V-*). The DF provides the node crossover
isolation at each port and the return-path low pass filters suppress any additional forward
energy at the input to the return transmitters. The location of these components is illustrated in
Figure 2-6.
Station Tilt (SG2440-XX*)
The SG2440 is configured in six different station slopes for either 750 MHz or 870 MHz
bandwidth. The slope is defined as a straight line from Ffwdmin to Ffwdmax. The total station
tilt is a combination of the receiver output and the RF amplifier tilt. Launch amplifiers
measured apart from the station may not be representative of the entire station tilt.
Station tilts include:
Key 3
Tilt (dB)
A
6
B
8
L
10
S
12.5
H
14
U
16
Where SG2-R* receivers are used, the components that determine station slope include the
SDR-* flatness board and LME’s. The LME’s provide tilt to the individual forward RF output
ports.
Tilt Selection
The tilt selection charts (Figures 2-7 and 2-8) depict the virtual linear output slope of the
SG2440. Use the corresponding bandwidth chart to determine the preferred tilt. The SG2440 is
custom configured from the factory, and any changes in the slope should be completed on the
bench prior to installation. The LME’s may be replaced to affect the tilt at individual forward
RF output ports.
SG2440 Installation and Operation Manual
2-12
Overview
Figure 2-7 illustrates the tilt selection chart for 750 MHz bandwidth:
Relative level, dB
Figure 2-7
Relative level dB versus 750 MHz slope
SG2440 750 MHz straight line slope chart
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
6 dB tilt
8 dB tilt
10 dB tilt
12.5 dB tilt
14 dB tilt
16 dB tilt
55
150
250
350
450
550
Frequency, MHz
Digital loading is 6 dB below analog levels
650
750
Figure 2-8 illustrates the tilt selection chart for 870 MHz bandwidth:
Relative level, dB
Figure 2-8 Relative level dB versus 870 MHz slope
SG2440 870 MHz straight line slope chart
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
6 dB tilt
8 dB tilt
10 dB tilt
12.5 dB tilt
14 dB tilt
16 dB tilt
55
150
250
450
550
650
Frequency, MHz
Digital loading is 6 dB below analog levels
SG2440 Installation and Operation Manual
350
750
870
Overview
2-13
RF Configuration (SG2440-XXX-*)
The SG2440 is configured with four active RF outputs (Key 4, suffix code D – 4 Bridger) that can
be padded as required to achieve the required output for the network. The power interconnect
cable (PIC) distributes RF between the lid board and the RF amplifier. Each port connector is
clearly identified on the chassis cover and silk screened on the amplifier. In addition, the PIC
cable features individual labels on each RF connector.
Forward path FP1 distributes signals to output ports 1 and 3 while FP2 distributes signals to
output ports 2 and 4. Individual return-path signals have unique connectors and cables RP1,
RP2, RP3, and RP4 that distribute the upstream signals to the lid board.
Gain and Hybrid Technologies (SG2440-XXX-X*)
The SG2440 is configured with a standard-gain silicon hybrid (suffix S).
Hybrid technologies include:
Key 5
Hybrid
technologies
S
Silicon
G
GaAs
Figure 2-9 illustrates typical SG2440 output levels, without any attenuation, based on the two
different channel loading options and standard 12.5 dB station slope.
Figure 2-9
Optical input versus RF output
Optical input vs RF output level
2
1
Optical input dBm
0
110 Ch load
-1
79 Ch load
-2
-3
-4
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
Output level (dBmV) @ 547.25 MHz
SG2440 Installation and Operation Manual
2-14
Overview
Forward Path Padding
The pad values presented in Table 2-2 serve as a starting point reference for typical
installations. While this chart is prepared specifically for 77-channel loading and standard gain
option, the difference for 110-channel loading is approximately 1 to 2 dB less.
It may be necessary to select a JXP value 1 dB or 2 dB lower for the receiver output (amplifier
input) pad than is shown in Table 2-2. This allows the output level at the four outputs to be
balanced with the individual output stage pads.
If the optical levels are high, the transmitter’s optical modulation index (OMI) is higher than
specified, or if the target output is low, the output pad may already be a non-zero value. To
ensure that the target output level is reached on the lowest level output branch, select input
pads of at least 1 dB.
Pad values shown are minimun values expected. If more padding is needed, increase the
receiver pads to a maximum of 10 dB and place the rest of the required attenuation at the
interstage pad facility.
Table 2-2 illustrates the typical padding required for optimum performance with a 79 channel
load:
Table 2-2
SG2440 pad chart-standard gain
Input
dBm/mW
38
39
40
41
42
Output dBmV at 547.25 MHz
43
44
45
46
47
48
49
50
51
2.0/1.6
Receiver JXPs
Output JXPs
10
10
10
9
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
1.5/1.4
Receiver JXPs
Output JXPs
10
9
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
1.0/1.3
Receiver JXPs
Output JXPs
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
0.5/1.1
Receiver JXPs
Output JXPs
10
7
10
6
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
0.0/1.0
Receiver JXPs
Output JXPs
10
6
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
–0.5/0.9
Receiver JXPs
Output JXPs
10
5
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
–1.0/0.8
Receiver JXPs
Output JXPs
10
4
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
–1.5/0.7
Receiver JXPs
Output JXPs
10
3
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
–2.0/0.6
Receiver JXPs
Output JXPs
10
2
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
–2.5/0.6
Receiver JXPs
Output JXPs
10
1
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
–3.0/0.5
Receiver JXPs
Output JXPs
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
Output is the equivalent at the highest frequency.
Reserve gain set for 2 dB.
SG2440 Installation and Operation Manual
Overview
2-15
Level Control (SG2440-XXX-XX*)
The SG2440 is configured with a temperature compensation unit (TCU) (Key 6 - T).
The flexibility of the SG2440’s forward and return path offers the system operator several
options in providing targeted services and unique programming to smaller and smaller service
areas. As networks divide, the use of a single pilot carrier to control automatic drive units
(ADU’s) for temperature compensation is no longer viable for the node.
To compensate for hybrid variation with temperature changes, the SG2-R/* receiver is designed
with special drive circuitry that works in conjunction with the TCU. The receiver gain is
automatically increased or decreased depending on the nodes ambient temperature.
Surge Protection and Powering Options (SG2440-XXX-XXX*)
The SG2440 can be surge protected with the following options:
Key 7
Surge Protectors
X
Surge protectors
F
One FTEC crowbar
G
Two FTEC crowbars
for dual ac powering
Powering options include single powering, redundant common powering, and split powering.
The SG2440 power supply (SG2-PS) is located in the housing lid to optimize heat transfer and to
balance the thermal load between the base and the lid. An umbilical cord connects the SG2-PS
to the lid motherboard (LIDB). A flexible power-distribution design enables you to power the
node from any of the four RF ports. Using fuses and shunts you can configure the node to
distribute power to the remaining active ports. You can also power the node locally through
either ac-only ports (2 and 4) while a second cable-plant power supply loops through the other
two main RF ports.
The power supply includes a heavy-duty, gas discharge tube surge protector located on the
amplifier module. You can replace this surge protector with one or two optional fast trigger
electronic crowbar (FTEC) surge protectors. The FTEC triggers at approximately 230 V and
presents a short circuit to the line during periods of over voltage. After the ac input voltage
returns to normal, the FTEC returns to its open-circuit state. This provides the node with a
level of protection against surge currents on the ac line. The same protector is used for both
supplies unless the split ac-feed option is implemented; then, the secondary or redundant power
supply is protected by either a conventional heavy-duty gas discharge tube or an optional FTEC.
The 20-ampere fuses are installed at the factory to provide power passing to additional
amplifiers. Section 3, “Bench Setup and Operation,” Powering the Node, discusses fusing options
that are also diagrammed in Figure 3-25. Figure 3-24 illustrates the location of the fuses.
The SG2440 optical node can be powered from either 60 Vac or 90 Vac system power supplies.
The unit is shipped from the factory set for 60 Vac powering. For systems equipped with 90 Vac
powering, the suitcase jumper on the dc power supply can be repositioned to optimize the supply
start-up voltage for the higher input range. Section 3, “Bench Setup and Operation” provides a
description of this procedure.
SG2440 Installation and Operation Manual
2-16
Overview
Figure 2-10 illustrates the SG2-PS power supply:
Figure 2-10
SG2-PS power supply
SG2-PS
NO USER SERVICEABLE
PARTS INSIDE
CAUTION
ASSEMBLED IN MEXICO
VOLTAGES IN EXCESS OF 250 VOLTS ARE
PRESENT UNDER COVER AND MAY BE
PRESENT AFTER POWER IS REMOVED
S E E INS TA LL ATIO N M ANU AL FO R S E R V ICE
ADJ
HI
LO
24V
5V
TEST
POINT
TEST
POINT
The SG2440 requires the SG2-PS power supply rather than the SG2-PS2 power supply. The
SG2-PS provides the power required to support DS-SG2-DRT-2X/A transmitters in a redundant
configuration.
SG2440 Installation and Operation Manual
Section 3
Bench Setup and Operation
Before you install the SG2440, it must be set-up to meet the power and configuration
requirements for the node location. This section presents the set-up procedures that are
recommended to ensure proper functioning of all components and simplify field installation.
This section also provides information concerning the operation of the various options and
applications required by your system.
Figure 3-1 illustrates the RF chassis with the cover removed indicating the location of major
components:
Figure 3-1
SG2440 RF chassis and major components
Driver hybrid
Forward pad port 1
LME*
RPLPF-V-*
Output hybrid port 1
Ingress switch or JXP2A
Return pad port 1
Diplex filter
Forward TP port 1
Driver hybrid
Forward pad port 2
LME*
RPLPF-V-*
Output hybrid port 2
Ingress switch or JXP2A
Return pad port 2
Diplex filter
Forward TP port 2
Return TP
port 1
Return TP
port 2
Return TP
port 3
Return TP
port 4
Forward TP port 3
Diplex filter
Ingress switch or JXP2A
Return pad port 3
Output hybrid port 3
RPLPF-V-*
LME*
Forward pad port 3
SDR* flatness board
MCB board
Forward TP port 4
Diplex filter
Return pad port 4
Ingress switch or JXP2A
Output hybrid port 4
RPLPF-V-*
LME*
Forward pad port 4
SDR* flatness board
TCU
Auto/manual select
Manual adjustment
SG2440 Installation and Operation Manual
3-2
Bench Setup and Operation
To facilitate on-line replacement on SG2440s equipped with redundant power supplies, you can
insert and remove optical modules and power supplies with the node powered and operational.
Forward Path Configuration
The following subsections present information to help you configure the forward path of the
SG2440-XXX-XXX-*. Figure 3-2 illustrates the upper-half housing or lid of the SG2440 and
identifies the location of all major forward-path components:
Figure 3-2
SG2440 lid showing major forward-path components
Status monitor
connection
Power interconnect
connector
Primary/secondary
control (JP1)
Power supply 2
Optical receiver A
Power supply 1
FP2
Status monitor
redundancy (JP2)
FP1
Forward configuration
location
Optical receiver B
Optical receiver C
Wavelength
selection jumper
Pad Rx A
Pad Rx C
TP Rx C
TP Rx A
Pad Rx B
TP Rx B
You can configure the SG2440 forward path by using the SG2-R/* receiver and one of four
configuration plug-in boards in the lid motherboard. Each board has a specific function and
receiver combination associated with it. Each board is clearly labeled and can be distinguished
from a return-path plug-in board by the row of pins at the bottom of each board. For detailed
information on the SG2-R/* receiver, see Section 4, “Optical Modules.”
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-3
SG2440 forward-path configuration options include:
Key 8
Forward Path Configuration
N
None
X
Standard forward board
A
Redundant standard forward
B
Forward segment board
D
Frequency band split with two
SG2-R/*s
E
Frequency band split with
redundant narrowcast
Refer to Figure 2-5 for more complete configuration information.
The next five subsections describe the forward path combinations.
Standard Forward
In the standard forward configuration, (Key X in the previous table), a single SG2-R/* drives all
four SG2440 outputs. The single SG2-R/* must be located in lid receiver position C.
Figure 3-3 illustrates the standard forward, single receiver function:
Figure 3-3
Standard forward configuration block diagram
RX C
JXP
RX B
JXP
RX A
JXP
Forward path 1
Forward path 2
Standard forward
single receiver
SG2440 Installation and Operation Manual
3-4
Bench Setup and Operation
Figure 3-4 illustrates the plug-in board required for the standard-forward, single-receiver
option:
Figure 3-4
Standard-forward, single-receiver board
T1
J1
J2
To set up the standard-forward, single-receiver option:
1
Confirm that the single receiver is installed in lid position C.
2
Confirm that a Standard Forward Board is installed in the lid board in the forward
configuration location as illustrated in Figure 3-2.
3
Ensure that the power interconnect cable (PIC) is properly connected to the lid and
electronics package (E-pack) connectors.
4
Test the optical power input level using an optical power meter. Figure 4-2 illustrates the
optical power test point on the top panel of the SG2-R/* receiver. The scaled voltage at this
test point is 1.0 V/mW. For 0 dBm (1.0mW) input, the receiver output is approximately a flat
25 dBmV per channel for 77 channels. Other output levels are presented in Table 4-2.
5
Verify that the green LED (ON), located on the top panel of the SG2-R/* is illuminated to
confirm enable status.
6
Verify that the green LED (NORM) is illuminated to confirm that the optical power is within
the recommended operating range.
7
Select a JXP-* pad from Table 2-2. Insert it to the left of the receiver at the receiver pad
facility. The test point and pad location for receiver C is located adjacent to the receiver as
illustrated in Figure 3-2.
8
Check all four outputs at the amplifier test points located in the four corners of the RF
chassis cover as illustrated in Figure 3-1. These test points have 20 dB insertion loss. For
example, if the output at a specific frequency is 46 dBmV, the test point should read
26 dBmV at the same frequency.
9
Determine how much output (excess or shortage) is present at the port with the lowest level
and insert the necessary pad into the receiver pad facility. Level variances between output
ports should be adjusted by placing a pad at the particular output pad position.
10 Refer to the Manual Gain Control and Thermal Control set-up procedure at the end of this
section for instructions to set the manual and TCU gain reserves.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-5
Standard Forward Redundant
In the standard forward redundant configuration (Key A), the output of either of two SG2-R/*
receivers drive all four SG2440 RF outputs. Operation in the redundant mode requires the
installation of two SG2-R/* receivers, one in lid position A, the other in position B. Each SG2-R/*
receives an optical input, but only one receiver has an active RF output based on the lid board
jumper settings.
Figure 3-5 illustrates the standard forward, redundant, two-receiver function:
Figure 3-5
Standard forward-redundant configuration block diagram
RX C
JXP
RX B
JXP
RX A
JXP
Forward path 1
Forward path 2
Standard forward
redundant
Figure 3-6 illustrates the plug-in board required for the standard forward, redundant,
two-receiver option:
Figure 3-6
Standard forward-redundant board
K1
C3
C1
T1
C4
C2
C5
J1
J2
The lid board contains a jumper (JP2) (illustrated in Figure 3-7) that determines which is the
primary and which is the secondary receiver. The manual control board (MCB) or Status
Monitor then activates receiver A or B. Refer to Section 4, “ Optical Modules,” Manual Control
Board for more information regarding use of the MCB.
SG2440 Installation and Operation Manual
3-6
Bench Setup and Operation
Figure 3-7 illustrates the JP2 suitcase jumper located on the lid motherboard:
Figure 3-7
JP2 jumper
J3
J11
FP1
JP2
A
STS MON
A
A
A
B
A
J10
FP2
To set up the standard forward, redundant, two-receiver option:
1
Confirm that an SG2-R/* receiver is installed in lid position A and B.
2
Confirm that a standard forward-redundant board is installed in the lid board in the
forward configuration location as illustrated in Figure 3-2.
3
Ensure that the PIC and SIC cables are properly connected to the lid and E-pack connectors.
4
Move the JP2 jumper to the A position thereby disabling receiver B.
5
Test the optical power input level on receiver A using an optical power meter. Figure 4-2
illustrates the optical power test point on the top panel of the SG2-R/* receiver. The scaled
voltage at this test point is 1.0 V/mW. For 0 dBm (1.0mW) input, the receiver output is
approximately a flat 25 dBmV per channel for 77 channels. Other output levels are
presented in Table 4-2
6
Verify that the green LED (ON), located on the top panel of receiver A is illuminated to
confirm enable status.
7
Verify that the green LED (NORM) on the top panel of receiver A is illuminated to confirm
that the optical power is within the recommended operating range.
8
Select a JXP-* pad from Table 2-2. Insert it to the left of receiver A at the receiver pad
facility. The test point and pad location for each receiver is located adjacent to the receiver
as illustrated in Figure 3-2.
9
Check all four outputs at the amplifier test points located in the four corners of the RF
chassis as illustrated in Figure 3-1. These test points have 20 dB insertion loss. For
example, if the output at a specific frequency is 46 dBmV, the test point should read
26 dBmV at the same frequency.
10 Determine how much output (excess or shortage) is present at the port with the lowest level
and insert the necessary pad into the receiver pad facility. Level variances between output
ports should be adjusted by placing a pad at the particular output pad position.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-7
11 Move JP2 to the B override position, which turns receiver A off.
12 Repeat Steps 5 through 10 and verify that the node output levels are the same as the
primary receiver. Adjust the receiver output pad only; do not re-adjust any output padding
in the E-pack.
13 Move JP2 back to the A position.
14 Refer to the Manual Gain Control and Thermal Control set-up procedure at the end of this
section for instructions to set the manual and TCU gain reserves.
Forward Segmented
In the forward segmented configuration (Key B), the output of two SG2-R/* receivers each drive
one pair of RF outputs of the SG2440. Operation in the segmented configuration requires the
installation of optical receivers in lid positions A and C (Figure 3-2). Receiver C drives forward
path one (RF outputs 1 and 3) and receiver A drives forward path two (RF outputs 2 and 4). The
forward segmented board contains a fixed attenuation circuit that strives to maintain the same
node output level as set with other forward configuration boards.
Figure 3-8 illustrates the forward-segmented, two-receiver function:
Figure 3-8
Forward-segmented, two-receiver configuration block diagram
RX C
JXP
RX B
JXP
RX A
JXP
-4 dB
Forward path 1
Forward path 2
-4 dB
Forward segment
configuration board
Figure 3-9 illustrates the plug-in board required for the forward segmented, two-receiver option:
Figure 3-9
Forward segmented board
J1
J2
To set up the forward segmented option:
1
Confirm that an SG2-R/* receiver is installed in lid position A and C.
2
Confirm that a forward segment board in installed in the lid board in the forward
configuration location as illustrated in Figure 3-2.
SG2440 Installation and Operation Manual
3-8
Bench Setup and Operation
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Place JP2 in the A position which forces receiver A on.
5
Test the optical power input level of each receiver using an optical power meter. Figure 4-2
illustrates the optical power test point on the top panel of the SG2-R/* receiver. The scaled
voltage at this test point is 1.0 V/mW. For 0 dBm (1.0mW) input, the receiver output is
approximately a flat 25 dBmV per channel for 77 channels. Other output levels are
presented in Table 4-2
6
Verify that the green LED (ON), located on the top panel of each SG2-R/* is illuminated to
confirm enable status.
7
Verify that the green LED (NORM) on each receiver is illuminated to confirm that the optical
power is within the recommended operating range.
8
Select a JXP-* pad from Table 2-2. Insert it to the left of each receiver at the receiver pad
facility. The test point and pad location for each receiver is located adjacent to the receiver
as illustrated in Figure 3-2.
9
Check the left side of the node (FP1 drives outputs Port 1 and Port 3) using the amplifier
test points located in the left corners of the RF chassis as illustrated in Figure 3-1. These
test points have 20 dB loss. For example, if the output at a specific frequency is 46 dBmV,
the test point should read 26 dBmV at the same frequency.
10 Determine how much output (excess or shortage) is present at the port with the lowest level
and insert the necessary pad into the receiver pad facility of receiver C. Level variances
between output ports should be adjusted by placing a pad at the particular output pad
position.
11 Check the right side of the node (FP2 drives outputs Port 2 and Port 4) using the amplifier
test points located in the right corners of the RF chassis.
12 Determine how much output (excess or shortage) is present at the port with the lowest level
and insert the necessary pad into the receiver pad facility of receiver A. Level variances
between output ports should be adjusted by placing a pad at the particular output pad
position.
13 Refer to the Manual Gain Control and Thermal Control set-up procedure at the end of this
section for instructions to set the manual and TCU gain reserves.
Unbalanced padding can degrade isolation performance. Ensure that equivalent optical power
levels are present on each receiver if possible.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-9
Frequency Band Split and Frequency Band Split with Redundancy
In the frequency band split configuration (Key D), two SG2-R/* receivers with different content
are combined and distributed to all four SG2440 RF outputs. Operation in the frequency band
split mode requires the installation of two SG2-R/* receivers, the primary broadcast receiver
carrying full spectrum must be in position C. The second receiver must carry signals above
450 MHz, and be located in position A. The JP2 jumper must be moved to the A position.
To prevent the accidental switching of receiver A to off, operators must disable status monitoring
control of the receivers.
Figure 3-10 illustrates the frequency band split, two-receiver function:
Figure 3-10
Frequency band split block diagram
Forward path 1
RX C
Forward path 2
RX B
RX A
Forward frequency
band split board
Figure 3-11 illustrates the plug-in board required for the frequency band split, two-receiver
option:
Figure 3-11
Frequency band split board
C9
C7
C5
L1
C2
L2
C4
L3
C6
L4
C8
C16
L9
C3
C1
C15
T2
J1
L5 C13
J2
K1
C11
L8
C10
C12
R1
T1
C14
The same configuration board is used when redundancy on the targeted services receiver is
required (Key E). In this mode, a third receiver is inserted into position B, and the set-up will be
the same, except that a status monitor or an MCB is required to provide the switching between
receivers A and B.
SG2440 Installation and Operation Manual
3-10
Bench Setup and Operation
To set up the frequency band split and frequency band split with redundancy, two receiver,
option:
1
Confirm that an SG2-R/* receiver is installed in lid positions A and C.
2
Confirm that a forward frequency band split with redundancy option board is installed in
the lid board in the forward configuration location illustrated in Figure 3-2.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Test the optical power input level of each receiver using an optical power meter. Figure 4-2
illustrates the optical power test point on the top panel of the SG2-R/* receiver. The scaled
voltage at this test point is 1.0 V/mW. For 0 dBm (1.0mW) input, the receiver output is
approximately a flat 25 dBmV per channel for 77 channels. Other output levels are
presented in Table 4-2.
5
Verify that the green LED (ON), located on the top panel of each SG2-R/*, is illuminated to
confirm enable status.
6
Verify that the green LED (NORM) on each receiver is illuminated to confirm that the optical
power is within the recommended operating range.
7
Select a JXP-* pad from Table 2-2. Insert it to the left of each receiver at the receiver pad
facility. The test point and pad location for each receiver is located adjacent to the receiver
as illustrated in Figure 3-2.
Recommended narrowcast levels are no greater than 6dB below the analog tier. Narrowcast
levels and received optical power at the narrowcast receiver will determine proper padding.
8
Check all four outputs at the amplifier test points located in the four corners of the
RF chassis as illustrated in Figure 3-1. These test points have 20 dB insertion loss. For
example, if the output at a specific frequency is 44 dBmV, the test point should read
24 dBmV at the same frequency.
9
Determine how much output (excess or shortage) is present at the port with the lowest level
and insert the necessary pad into the pad facility of receiver C. Level variances between
output ports should be adjusted by placing a pad at the particular output pad position.
10 Verify the band-split receiver A digital output level by checking a single test point.
11 Determine how much output (shortage or excess) is present at the port and insert the
necessary pad into the pad facility of receiver A. Do not change the padding at the output
ports that was previously established with the broadcast levels.
12 Refer to the Manual Gain Control and Thermal Control set-up procedure at the end of this
section for instructions to set the manual and TCU gain reserves.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-11
Return Path Configuration
The following subsections present information to help you configure the return path for the
SG2440-XXX-XXXX-X*. Figure 3-12 illustrates the upper-half housing or lid of the SG2440 and
identifies the location of all major return-path components:
Figure 3-12
SG2440 lid showing major return-path components
TP XMTR B
Pad XMTR B
Return configuration
location
RP1
TP XMTR A
Pad XMTR A
TP DRT1
Pad DRT1
TP DRT2
Pad DRT2
Status monitor
connection
Power interconnect
connector
Primary/secondary
control (JP1)
RP3
RP2
RP4
Power supply 2
Optical XMTR B
Optical XMTR A
Power supply 1
DRT1
DRT2
Status monitor
redundancy (JP2)
You can configure the SG2440 return path using a variety of analog and digital transmitters
and one of ten configuration plug-in boards in the lid motherboard. Each board has a specific
function and transmitter combination associated with it. Each board is clearly labeled and can
be distinguished from the forward path plug-in boards by the absence of pins at the bottom of
each board. For detailed information on the return path transmitters, see Section 4, “ Optical
Modules.”
SG2440 Installation and Operation Manual
3-12
Bench Setup and Operation
SG2440 return-path configuration options include:
Key 9
Return Path Configuration
X
None
A
Single combined return – single analog or 1X digital transmitter
B
Redundant single combined return — two analog or two 1X digital
transmitters of the same wavelength
C
Redundant single combined return — two 1X digital transmitters with
different wavelengths
D
Split return — two analog or two 1X digital transmitters of the same
wavelength
E
Split return — two 1X digital transmitters with different wavelengths
F
Split return — one 2X Time Division Multiplexed (TDM) digital transmitter
G
Split redundant return — two 2X TDM digital transmitters of the same
wavelength
H
Split redundant return — two 2X TDM digital transmitters with different
wavelengths
J
Four separate returns — two 2X TDM only with the same wavelengths
K
Four separate returns — two 2X TDM only with different wavelengths
Refer to Figure 2-5 for more complete configuration information.
The next five subsections describe the return path combinations.
Single Combined and Redundant Single Combined Return
In the single combined return configuration (Key A), all four RF returns are combined into a
single optical transmitter. The single optical transmitter must be located in lid position B.
Figure 3-13 illustrates the single combined return with redundant option board function:
Figure 3-13
Single combined return, redundant option configuration block diagram
RP 1
JXP
TX B
RP 2
JXP
TX A
RP 4
JXP
MCX DRT 1
JXP
MCX DRT 2
RP 3
Single combined
return
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-13
Figure 3-14 illustrates the plug-in board required for the single combined return with
redundant option:
T3
C6 L2
R9
Figure 3-14
Single return with redundant option board
Q2
T1
C5
Q1
T4
R16 R14 R12
C2
R13
R6
R8
C1
C8
R1
C4
C9 R7
R17
R2
L1
C3
R10 R11
R3 R4 R5 C7
C10
T2
J1
The same board is used in the redundant single combined return configurations (Keys 9B and
9C). The combined return path signal is present at both transmitter inputs. When a single
return transmitter is used, install a JXP-15A (15 dB) pad in the transmitter A pad location to
terminate the signal. In the redundant configuration, a second transmitter is added to the lid in
position A.
To set up the single combined return option:
1
Confirm that a single transmitter is installed in lid position B.
2
Confirm that a single return, with redundant option, board is installed in the lid board in
the return configuration location as illustrated in Figure 3-12.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Measure the optical power level at the test point provided on the top of the return path
transmitter. The scaled voltage at this test point is 1.0V/mW.
5
Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to
confirm enable status. Refer to Section 4, “ Optical Modules,” for fault LED functions.
6
Review return-path system levels. The unit is configured to drive the laser to the
recommended level (+15 dBmV) when the total combined power at all housing ports is
approximately +28 dBmV.
Test point TP4 is a −20 dB test point located after the JXP pad location and indicates the
level into transmitter B.
7
Place the proper JXP pad into the B transmitter pad facility.
For single combined, redundant return operation, ensure that the second transmitter is
installed in lid position A. To set it up, use the same procedure that was used for the single
combined return transmitter — Steps 1 through 7 above.
SG2440 Installation and Operation Manual
3-14
Bench Setup and Operation
Split Return with Analog and 1X Digital Transmitters
In the split return configuration (Keys D and E), each pair of RF returns is applied to a separate
return optical transmitter. The optical transmitters must be located in lid positions A and B.
Figure 3-15 illustrates the split return board function:
Figure 3-15
Split return configuration block diagram
RP 1
JXP
TX B
RP 2
JXP
TX A
RP 4
JXP
MCX DRT 1
JXP
MCX DRT 2
RP 3
Split return
board
In the split return configuration, status monitor signals are present on RP 1 and TX B.
Figure 3-16 illustrates the plug-in board required for the split return option:
Figure 3-16
Split return board
T1
T2
J1
To set up the split return option:
1
Confirm that a return transmitter is installed in lid position B and A.
2
Confirm that a split return board is installed in the lid board in the return configuration
location as illustrated in Figure 3-12.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Measure the optical power level at the test point provided on the top of each return
transmitter. The scaled voltage at this test point is 1.0V/mW.
Refer to Section 4, “ Optical Modules,” for instructions on 1X digital transmitter operation.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-15
5
Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to
confirm enable status. Refer to Section 4, “ Optical Modules” for fault LED functions.
6
Review return-path system levels. The unit is configured to drive the laser to the
recommended level (+15 dBmV) when the total combined power at all housing ports is
approximately +28 dBmV.
Test point TP4 and TP5 are −20 dB test points located after the JXP pad locations and
indicate the level into transmitter B and A.
7
Place the proper JXP pad into the transmitter pad facility.
Split Return with a 2X TDM Digital Transmitter
In this split return configuration (Key F), one pair of RF returns is applied to the digital return
transmitter through the D subconnector. The other pair of RF returns is carried by a cable
connector (Figure 3-17) to RF input B on top of the transmitter. The optical transmitter must be
located in lid position B. The same split return board illustrated in Figure 3-16 is used in this
configuration also.
Figure 3-17 illustrates the DS-SG2-DRT-2X/A cable connector:
Figure 3-17
DS-SG2-DRT-2X/A cable connector
SG2440 Installation and Operation Manual
3-16
Bench Setup and Operation
Figure 3-18 provides greater detail of the DS-SG2-DRT-2X/A second RF input cable connection
to the LIDB. This cable connects the other half of the split return to the DS-SG2-DRT-2X/A.
Figure 3-18
DS-SG2-DRT-2X/A cable connector
Transmitter to node
service cable
Second RF input cable
To set up the split return option with a single 2X TDM Digital Return Transmitter:
1
Confirm that a return transmitter is installed in lid position B.
2
Confirm that a split return board is installed in the lid board in the return configuration
location as illustrated in Figure 3-12.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Refer to Section 4, “ Optical Modules” for instructions on 2X Digital Transmitter operation.
5
Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to
confirm enable status. Refer to Section 4, “ Optical Modules,” for fault LED functions.
6
Review return-path system levels. The unit is configured to drive the laser to the
recommended level (+15 dBmV) when the total combined power at all housing ports is
approximately +28 dBmV.
Test point TP4 and TP5 are −20 dB test points located after the JXP pad locations and
indicate the level into transmitter B and A.
7
Place the proper JXP pad into the transmitter pad facility.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-17
Split Redundant Return with 2X Digital Transmitters
In the split return with redundancy configuration (Key G and H), each pair of RF returns is
applied to both return optical transmitters. The signal from RP1 and RP3 is placed on the D
subconnector A input of each transmitter. Cable connectors from MCX connectors DRT1 and
DRT2 carry the signal from RP2 and RP4 to RF input B on top of each transmitter. The optical
transmitters must be located in lid positions A and B. This configuration works only with
2X TDM digital return transmitters.
Figure 3-19 illustrates the split return with redundancy board function:
Figure 3-19
Split return with redundancy configuration block diagram
RP 1
JXP
TX B
RP 3
JXP
TX A
RP 2
JXP
MCX DRT 1
RP 4
JXP
MCX DRT 2
Split return
with redundancy
Figure 3-20 illustrates the plug-in board required for the split return with redundancy option:
Figure 3-20
Split return with redundancy board
T1
T2
T3
T4
J1
SG2440 Installation and Operation Manual
3-18
Bench Setup and Operation
Figure 3-21 illustrates the two DS-SG2-DRT-2X/A transmitters installed in the lid of the
SG2440 and the cabling required for the split return with redundancy option:
Figure 3-21
Split return with redundancy option – configuration and cabling
SG2000
INPUT
A
SG2000
INPUT
A
D igital Transm itt er
STATUS DS-SG2-DRT-2X/A
1310 DFB
INPUT
B
DRT 1 cable
D igital Transm itt er
STATUS DS-SG2-DRT-2X/A
1310 DFB
INPUT
B
DRT 2 cable
To set up the split return with redundancy option:
1
Confirm that a 2X TDM digital return transmitter is installed in lid position B and A.
2
Confirm that a split return with redundancy board is installed in the lid board in the return
configuration location as illustrated in Figure 3-12.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Ensure that the cable connectors are installed from the MCX connectors marked DRT 1 and
DRT 2 to the respective RF inputs on top of each transmitter as illustrated in Figure 3-21.
5
Refer to Section 4, “ Optical Modules,” for instructions on 2X digital transmitter operation.
6
Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to
confirm enable status. Refer to Section 4, “ Optical Modules,” for fault LED functions.
7
Review return-path system levels. The unit is configured to drive the laser to the
recommended level (+15 dBmV) when the total combined power at all housing ports is
approximately +28 dBmV.
Test points TP4 and TP5 are −20 dB test points located after the JXP pad locations and
indicate the level of RP1 and RP3 into transmitter B and A.
Test points TP6 and TP7 are −20 dB test points located after the JXP pad locations and
indicate the level of RP2 and RP4 into transmitter B and A.
8
Place the proper JXP pad into the transmitter pad facility.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-19
Segmented Return with 2X Digital Transmitters
In the segmented return configuration (Keys J and K), each RF return is multiplexed on
different optical return transmitters. The signal from RP1 is placed on the D subconnector of
transmitter B. The signal from RP3 is carried by cable from the MCX connector (DRT1) to RF
input B of transmitter B. The signal from RP2 is placed on the D subconnector of transmitter A.
The signal from RP4 is carried by cable from the MCX connector (DRT2) to RF input B of
transmitter A. The optical transmitters must be in lid positions A and B. This configuration
works only with 2X TDM digital return transmitters.
Figure 3-22 illustrates the segmented return board function:
Figure 3-22
Segmented return configuration
RP 1
-4 dB
JXP
TX B
RP 2
-4 dB
JXP
TX A
RP 3
-4 dB
JXP
MCX DRT 1
RP 4
-4 dB
JXP
MCX DRT 2
Segmented
return
Figure 3-23 illustrates the plug-in board required for the segmented return option:
Figure 3-23
Segmented return board
R12
R11 R13
R8
R7
R9
R3
R1
R5
R4
R2
R6
J1
To set up the segmented return option:
1
Confirm that a return transmitter is installed in lid position B and A.
2
Confirm that a segmented return board is installed in the lid board in the return
configuration location as illustrated in Figure 3-12.
3
Ensure that the PIC cable is properly connected to the lid and E-pack connectors.
4
Ensure that the cable connectors are installed from the MCX connectors marked DRT1 and
DRT2 to the respective RF inputs on top of each transmitter.
SG2440 Installation and Operation Manual
3-20
Bench Setup and Operation
5
Refer to Section 4, “ Optical Modules,” for instructions on 2X Digital Transmitter Operation.
6
Verify that the green LED (ON), located on the top panel of the transmitter, is illuminated to
confirm enable status. Refer to Section 4, “ Optical Modules,” for fault LED functions.
7
Review return-path system levels. The unit is configured to drive the laser to the
recommended level (+15 dBmV) when the total combined power at all housing ports is
approximately +28 dBmV.
Test point TP4 is a −20 dB test point located after the JXP pad location and indicates the
level of RP1 into transmitter B.
Test point TP5 is a −20 dB test point located after the JXP pad location and indicates the
level of RP2 into transmitter A.
Test point TP6 is a −20 dB test point located after the JXP pad location and indicates the
level of RP3 into transmitter B.
Test point TP7 is a −20 dB test point located after the JXP pad location and indicates the
level of RP4 into transmitter A.
For more specific information regarding return path setup procedures, refer to the supplemental
document Return Path Level Selection, Setup, and Alignment Procedure.
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-21
Powering the Node
You can conveniently power the SG2440 by applying 60 Vac or 90 Vac to housing Port 2 or
Port 4. These ports are not used for RF purposes. All ports are rated at 15 amperes maximum
and are fused with common, blade-type 20 ampere automotive fuses. Shunt F10 is used to
disconnect ac power from the primary power supply. Jumper JP1, located on the lid board, is
used to disconnect ac power from the secondary power supply. The dc power supply 24 V circuit
includes fuse F1 rated at 10 A; the 5 V circuit includes F2 which is rated at 5 A.
Figure 3-24 illustrates the fuse locations in the SG2440:
Figure 3-24
Fuse locations
F7
F8
STATUS
MONITOR
-20dB
-20dB
PORT
1
H
PORT
2
H
FWD EQ
FWD EQ
JXP
L
L
JXP
JXP
JXP
SG2440-
F1
F6
CONT AINS PART S
AND ASSEMBL IES
SUSCEPT IBL E TO
I
C
S
FTEC
DAM AGE BY
ELECT ROSTAT IC
DISCHARGE ( ESD)
STATUS
MONITOR
F5
F4
F10
F2
-20dB
CAUT ION:
-20dB
L
P
F
L
P
F
I
C
S
FTEC
RP2
RP1
STATUS MONITOR
F9
-20dB
REF ER TO
M ANUAL F OR
F USE VAL UES
JXP
RESP
I
C
S
L
P
F
F3
JXP
-20dB
JXP
RESP
L
P
F
RP4
RP3
PORT
3
FP1
INP UT
MAN
FP2
INP UT
I
C
S
JXP
L
TCU
H
MAN
FWD EQ
+5V
FWD EQ
+24V
PORT
4
L
H
AUTO
-20dB
-20dB
EM BLED IN MEXICO
F1
(+24 Vdc)
F2
(+5 Vdc)
SG2440 Installation and Operation Manual
3-22
Bench Setup and Operation
In addition to providing overcurrent protection, fuse locations also determine the paths for ac
bypassing through the housing.
CAUTION!
Voltages up to 90 Vac are accessible. To avoid shock hazard confirm that no power is applied to the node before
removing cover or replacing fuses.
Figure 3-25 diagrams fuse configurations for ac and dc powering:
Figure 3-25
Fuse configuration
Housing
E-pack
F1-20A
Port IN
F2-20A
Port 1
F5-20A
Port 2
OUT
Unused
Port 4
Port 4
Port 3
Port 5
F10-Shunt
F8-20A
FTEC F6
FTEC F9
F3-20A
Port 1
Port 2
F7-Shunt
F4-20A
Port 3
JP1
Power supply
#1
+24V
Power supply
#2
+5V
+24V
Or
+5V
Or
F2-5A
+5V
F1-10A
+24V
Lid
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-23
Table 3-1 identifies and describes the ac fuse options:
Table 3-1
AC fuses
Fuse
Function
Rating
Type
F1
Passes ac to/from Port IN of the housing base.
20 A, 32
Vdc
Auto, plug-in, fast blow
F2
Passes ac to/from Port OUT of the housing base.
20 A, 32
Vdc
Auto, plug-in, fast blow
F3
Passes ac to/from Port 1 of the housing base.
20 A, 32
Vdc
Auto, plug-in, fast blow
F4
Passes ac power to/from Port 3 of the housing base.
20 A, 32
Vdc
Auto, plug-in, fast blow
F5
Passes ac from ac only port (Port 2) of the housing base.
20 A, 32
Vdc
Auto, plug-in, fast blow
F6
FTEC
F7
This shunt passes ac power from the node to the primary power
supply. It is removed when the node is configured in a split powering
mode.
35 A, 32
Vdc
Auto, plug-in, fast blow
F8
Passes ac from ac only port (Port 4) in the housing base
20 A, 32
Vdc
Auto, plug-in, fast blow
F9
FTEC
F10
This shunt passes ac power from the node to the primary power
supply. It is removed to disconnect the power supply in a single
powering mode.
35 A, 32
Vdc
Auto, plug-in, fast blow
Power Supply Settings
You can power the SG2440 from 60 Vac or 90 Vac system supplies. The unit is shipped from the
factory set for 60 Vac (LO). If your system uses 90 Vac powering, reposition the suitcase jumper
on the dc power supply to the 90 Vac (HI) position to optimize the supply turn-on voltage for the
higher input range. Note that no damage results if the jumper is not changed. In a 90 Vac
system, changing the jumper ensures that the dc supply does not turn on until the proper input
voltage level is reached. This prevents excessive loading of the cable plant power supply during
turn-on after a power-off situation.
Figure 3-26 illustrates the location of the LO/HI jumper:
Figure 3-26
SG2-PS power supply
SG2-PS
NO USER SERVICEABLE
PARTS INSIDE
CAUTION
ASSEMBLED IN MEXICO
VOLTAGES IN EXCESS OF 250 VOLTS ARE
PRESENT UNDER COVER AND MAY BE
PRESENT AFTER POWER IS REMOVED
S E E INS TA LL ATIO N M ANU AL FO R S E R V ICE
ADJ
HI
LO
24V
5V
TEST
POINT
TEST
POINT
SG2440 Installation and Operation Manual
3-24
Bench Setup and Operation
The dc supply can deliver 4.3 A at +24 V and 0.85 A at +5 V. Test points are provided for 24 Vdc
and 5 Vdc supplies. Two green LEDs on the power supply indicate the overall health of the
nodes dc power bus. The power supply is factory calibrated for 24 V and should not need output
voltage adjustment; however, R51 is available if required. Figure 3-26 illustrates the location of
R51 (ADJ).
The ac input from the feederline to the power supply must be between 44 Vrms and 90 Vrms
with a line frequency of 50 Hz or 60 Hz. The waveshape of the input voltage must be
quasi-squarewave. The power supply features a self-protection attribute that shuts it down for
instantaneous line voltages higher than 200 V. A precision output regulator protects against
overcurrent and short circuits, thus providing a precise output voltage.
Single Power Supply or Commonly Powered Redundant Supplies
To activate a single power supply or commonly powered redundant supplies, place jumper JP1
on the SG2440 lid (illustrated in Figure 3-12) over the upper two pins as illustrated in
Figure 3-27. This connects power supplies one and two to the primary ac power feed.
Figure 3-27
JP1 common-powered single or redundant power configuration
Primary ac
Power supply 1
Power supply 2
Secondary ac
Individually Powered Supplies
To activate split ac powering of the node, place jumper JP1 over the lower two pins as
illustrated in Figure 3-28. Remove shunt F7 as well. You must also remove F8 if the secondary
power source originates from Port 4. The primary ac power feed now connects to power supply 1
and an independent secondary ac source is connected to power supply 2. This configuration
implies that the primary ac power source originates from Port IN, Port 1, or Port 2. The
secondary ac power source originates from Port OUT, Port 3, or Port 4.
Figure 3-28
JP1 split-powered redundant power supply configuration
Primary ac
Power supply 1
Power supply 2
Secondary ac
SG2440 Installation and Operation Manual
Bench Setup and Operation
3-25
Other power configurations are possible, but not recommended.
CAUTION!
Take extreme care not to directly connect primary and secondary power sources when implementing other
configurations.
Manual Gain Control and Thermal Control
While you can control the gain manually or automatically, you should always operate the
SG2440 in Auto mode. In the Auto mode, the SG2440 compensates for hybrid drift over
temperature with special drive circuitry located in the SG2-R/* receiver.
Manual control only — there is no compensation for changes in amplifier gain due to input
level or temperature fluctuations.
Automatic control — the standard thermal control unit (TCU) is installed at the factory and
compensates for gain changes due to temperature fluctuations only.
Manual Gain Control
1
Connect a signal level meter to one of the forward test points located in the corner of the
electronics package and tune it to a channel near 550 MHz.
2
Position the drive selector to MAN. Figure 3-1 illustrates the location of the AUTO/MAN drive
selector.
3
Turn the gain control (MAN ADJ) to maximum (fully clockwise) and then turn it
counterclockwise to reduce the output by 2 dB.
It is recommended that when setting levels at extreme cold temperatures, that the manual gain
control be reduced by 3 dB. At extremely hot temperatures, the manual gain control should be
reduced by only 1 dB. This procedure ensures sufficient gain margin upon return to normal
operating temperatures.
Thermal Control, Model TCU
1
Perform steps 1 through 3 under Manual Gain Control.
2
Position the drive unit selector to AUTO.
3
Turn the level control potentiometer on the TCU to return the node output to the preferred
output level.
SG2440 Installation and Operation Manual
Section 4
Optical Modules
This section identifies and provides detailed information on the forward and return optical
modules that you can use with the SG2440. It also discusses their installation, removal, and
cleaning of the optical connectors.
SG2440 Optical Modules
The forward path optical module available with the SG2440 is the SG2-R/* receiver.
The return path analog optical modules include:
SG2-FPT — non-isolated Fabry-Perot return transmitter
SG2-EIFPT — isolated Fabry-Perot return transmitter
SG2-DFBT and SG2-DFBT/3 — isolated DFB return transmitters
The return path digital optical modules include:
DS-SG2-DRT/A and DS-SG2-DRT-2X/A — digital return transmitters
Designed for use in the node platform, the modules combine high performance and easy
maintenance.
Installing SG2440 Optical Modules
The SG2440 optical modules design enables you to install them while the node is in service.
To install an optical module:
1
Determine the proper slot for the module by referring to Section 3, “Bench Setup and
Operation” and Figure 3-2 or Figure 3-12.
2
Position the module in the appropriate slot and press gently on the casting until it is fully
seated. Tighten the two mounting bolts to secure the module in the SG2440 lid.
3
Remove the dust covers from the service cable connector and the module’s optical connector.
4
Carefully clean the optical connector using a suitable optical cleaning kit.
5
Connect the service cable to the module’s optical connector.
6
If necessary, check the optical power levels. Check and align the RF levels in accordance
with system requirements and procedures.
SG2440 Installation and Operation Manual
4-2
Optical Modules
Removing SG2440 Optical Modules
The SG2440 optical modules design enables you to remove them while the node is in service.
CAUTION!
The module surfaces may be hot. Allocate sufficient time for the module to cool before handling.
To remove an optical module:
1
Disconnect the service cable from the optical connector assembly on the module. Place dust
covers on the service cable connector and the modules optical-connector assembly.
2
Loosen the two mounting bolts that secure the optical module in the SG2440 lid.
3
Pull the module from the SG2440 lid using the wire handle on top of the module.
Cleaning the Optical Connector
The design of the SG2440 optical module connector enables you to clean it easily without
removing the module from the node.
To clean the connector:
1
If necessary, disconnect the service cable from the modules’ optical-connector assembly.
Place a dust cover on the service cable connector.
2
Lift the metal tab to release the optical-connector assembly and pull it out of the module.
CAUTION!
Do not pull the optical connector out more than two inches from the casting wall. If you pull the connector out too far,
you must disassemble the module and respool the fiber.
3
Remove the bulkhead adapter from the internal optical connector.
4
Carefully clean the optical connector and bulkhead adapter using a suitable optical
connector cleaning kit. If an optical connector cleaning kit is not available, clean the
connector using pure isopropyl alcohol (99%) and a lint-free wipe. Dry it with filtered
compressed air. You can also clean the bulkhead adapter using filtered compressed air.
5
Re-assemble the bulkhead adapter to the internal optical connector. Ensure that you install
the internal optical connector in the end of the bulkhead adapter bearing the metal tangs.
6
Snap the optical connector assembly back into the module.
7
If necessary, clean and reconnect the service cable.
SG2440 Installation and Operation Manual
Optical Modules
4-3
SG2-R/* Optical Receiver
The SG2-R/* is a line of forward-path optical receivers used in the SG 2440 node platform. It is
designed to be used in conjunction with an AM-OMNI-LM*, GX2, or other similar optical
transmitter.
The SG2-R/* is designed specifically for high performance in the SG2440. The receiver uses an
integrated optical-hybrid photodetector for improved RF performance over the entire 40 MHz
through 870 MHz passband. It is enabled and disabled in response to a signal from the status
monitor transponder or manual control board (MCB). This provides excellent isolation,
improved reliability, and reduced power consumption when the receiver is used in redundant
applications.
The SG2-R/* is outfitted with special drive circuitry that works in conjunction with the TCU on
the RF amplifier. The SG2-R/* drive circuitry controls the amount of gain that is provided by
the receiver, depending on the voltage fed from the TCU. If there is no voltage being fed from
the TCU the unit will remain in its default condition. This important default function enables
the SG2-R/* to be used with an SG 2000 that relies on the traditional TCU or ADU drive
circuitry located on the RF amplifier.
Figure 4-1 illustrates a functional block diagram of the SG2-R/* receiver:
Figure 4-1
SG2-R/* block diagram
Module
enabled
Threshold
comparators
Module
fault
+24V
Module
enable
Module enable
logic
Hybrid current
monitor
Optical receiver hybrid
Optical
input
Hybrid current
sense signal
(10V/A)
Hybrid current
test point
(1.0 V/A)
Matching
network
RF
output
Verilosser
drive
Optical power
test point
(1 V/mW)
Optical power
monitor
Optical power
sense signal
(1 V/mW)
Threshold
comparators
Low
Normal
High
SG2440 Installation and Operation Manual
4-4
Optical Modules
Figure 4-2 illustrates the SG2-R/* receiver:
Figure 4-2
SG2-R/*
Optical Receiver
OPTICAL
POWER
SG 2 - R
ASSEMBLED
IN MEXICO
OPTICAL
POWER
(1 V/mW)
HYBRID
CURRENT
(1 V/A)
O
N
F
A
U
L
T
L
O
W
N
O
R
M
H
I
G
H
Wavelength
selection jumper
Table 4-1 provides additional information on the user-related features of the SG2-R/*:
Table 4-1
SG2-R/* features
Feature
Description
Wavelength selection jumper
The SG2-R/* can be used with either 1310 nm or 1550 nm transmitters. A
wavelength selection jumper on top of the module optimizes the optical
power test point and optical power status indicator calibration for the
system wavelength. Note that the jumper has no effect on the
optical-to-RF performance (gain, flatness, slope) of the module.
Optical power test point
This test point enables monitoring of the optical power level at the input to
the module. The nominal scale factor is 1.0 V/mW.
Hybrid current test point
This test point enables monitoring the current drawn by the amplifier
section of the integrated optical receiver hybrid. The nominal scale factor
is 1.0 V/A. The hybrid current test-point voltage is between 0.135 V and
0.350 V (hybrid current of 135 mA through 350 mA) when the module is
enabled under normal operating conditions.
Receiver enable
A green LED (ON) that provides visual indication of the receiver’s enable
status.
Fault indicator
A red LED that illuminates when the module is enabled but the hybrid
current is outside the normal operating range.
Optical power status
A green LED (NORM) that is on when the optical power is within the
recommended operating range (refer to Table A-4). Two red LEDs indicate
that the optical power is above (HIGH) or below (LOW ) the recommended
optical input power range.
SG2440 Installation and Operation Manual
Optical Modules
4-5
The wavelength selection jumper is factory-set and provides optimum calibration in a 1310 nm
system.
If you need to reset the jumper, move it to the preferred position as illustrated in Figure 4-3.
Figure 4-3
Wavelength selection jumper
Optical Receiver
SG2 - R
ASSEMBLED
IN MEXICO
OPTICAL
POWER
(1 V/mW)
HYBRID
CURRENT
(1 V/A)
Table 4-2 provides the output and default levels (bold) of the SG2-R/*:
Table 4-2
SG2-R/* minimum output levels
Optical input level
(dBm/mW)
TP Volts
(1 mW=1 V)
Output (dBmV) 77
channels
Output (dBmV)
110 channels
Comments
3.2/2.1
2.1
32
30
High level alarm
3.0/2.0
2.0
31
30
High level alarm
2.8/1.9
1.9
31
29
High level alarm
2.6/1.8
1.8
30
29
High level alarm
2.3/1.7
1.7
30
28
High level alarm
2.0/1.6
1.6
29
28
Normal
1.8/1.5
1.5
29
27
Normal
1.5/1.4
1.4
28
26
Normal
1.0/1.3
1.3
27
25
Normal
0.8/1.2
1.2
27
25
Normal
0.5/1.1
1.1
26
24
Normal
0.0/1.0
1.0
25
23
Optimum
–0.5/0.9
0.9
24
22
Normal
–1.0/0.8
0.8
23
21
Normal
–1.5/0.7
0.7
22
20
Normal
–2.0/0.6
0.6
21
19
Normal
–2.5/0.6
0.6
20
18
Normal
–3.0/0.5
0.5
19
17
Normal
–3.5/0.5
0.5
18
16
Normal
–4.0/0.4
0.4
17
16
Normal
–5.2/0.3
0.3
15
13
Low level alarm
Typical output levels are approximately 2 dB greater than the minimum levels.
Optical modulation index (OMI) for 77 channels (per channel): 0.0403.
For 1550 nm operation, the RF levels out of the transmitter will be 0.42 dB higher at any given optical input.
OMI for 110 channels (per channel): 0.0337.
Optical transmitter wavelength is 1310 nm.
SG2440 Installation and Operation Manual
4-6
Optical Modules
Figure 4-4 illustrates the relationship between test-point voltage (Vdc) and optical power (dBm):
Figure 4-4
Test-point voltage versus optical power
5
4
Optical power (dBm)
3
2
1
0
-1
-2
-3
-4
-5
-6
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
Test point DC Voltage (Vdc)
1 Volt = 1 Mw optical power
10 Log10 x Voltage (DC) = optical power (dBm)
SG2440 Installation and Operation Manual
2.50
2.75
3.00
Optical Modules
4-7
SG2-FPT Optical Transmitter
The SG2-FPT is a non-isolated Fabry-Perot return-path optical transmitter originally designed
for use in the SG 2000 node platform. It has a nominal optical output power of 0.4 mW and can
be used in conjunction with an AM-RPR, AM-OMNI-RPR/2C, or other similar return path
optical receiver. Figure 4-5 illustrates the SG2-FPT:
Figure 4-5
SG2-FPT
SG2000
Optical Transmitter
OPTICAL
POWER
(1 V/mW)
LASER
CURRENT
(1 V/A)
O
N
F
A
U
L
T
SG2-FPT
ASSEM BLED
IN MEXICO
Table 4-3 provides information on the user-related features of the SG2-FPT:
Table 4-3
SG2-FPT features
Feature
Description
Optical power test point
This test point enables monitoring of the optical output level of the module.
The nominal scale factor is 1.0 V/mW. The optical power test point voltage
is between 0.375 V and 0.425 V (optical power of 0.375 mW through
0.425 mW) when the module is enabled under normal operating
conditions. Note that the optical power test point does not track changes in
optical power due to the laser tracking error.
Laser current test point
This test point enables monitoring of the current drawn by the laser diode.
The nominal scale factor is 1.0 V/A. The laser current test point voltage is
between 4 mV through 90 mV (laser current of 4 mA through 90 mA) when
the module is enabled under normal operating conditions. The laser
current is expected to vary widely with changes in temperature, but should
always remain between the limits.
Transmitter enable
A green LED (ON) that provides visual indication of the transmitter’s enable
status.
Fault indicator
A single red LED that lights when the hybrid current is outside the normal
operating range, the laser output power is below normal limits, or the laser
current is above normal limits. Because the laser output requires a short
period of time to stabilize, it is acceptable for the fault indicator to
illuminate during the stabilization interval (approximately 2 seconds). Note
that the module must be enabled for the fault indicator to function.
SG2440 Installation and Operation Manual
4-8
Optical Modules
SG2-EIFPT Optical Transmitter
The SG2-EIFPT (illustrated in Figure 4-6) is an enhanced, isolated, Fabry-Perot return-path
optical transmitter originally designed for use in the SG 2000 node platform. It has a nominal
optical output power of 1 mW and can be used in conjunction with an AM-RPR,
AM-OMNI-RPR/2C, or other similar return path optical receiver.
Figure 4-6
SG2-EIFPT
SG2000
Optical Transmitter
OPTICAL
POWER
(1 V/mW)
LASER
CURRENT
(1 V/A)
O
N
F
A
U
L
T
SG2-EIFPT
ASSEM BLED
IN MEXICO
Table 4-4 provides information on the user-related features of the SG2-EIFPT:
Table 4-4
SG2-EIFPT features
Feature
Description
Optical power test point
This test point enables monitoring of the optical output level of the module.
The nominal scale factor is 1.0 V/mW. The optical power test point voltage
is between 0.945 V and 1.055 V (optical power of 0.945 mW through
1.055 mW) when the module is enabled under normal operating
conditions. Note that the optical power test point does not track changes in
optical power due to the laser tracking error.
Laser current test point
This test point enables monitoring of the current drawn by the laser diode.
The nominal scale factor is 1.0 V/A. The laser current test point voltage is
between 4 mV through 90 mV (laser current of 4 mA through 90 mA) when
the module is enabled under normal operating conditions. The laser
current is expected to vary widely with changes in temperature, but should
always remain between the limits.
Transmitter enable
A green LED (ON) that provides visual indication of the transmitter’s enable
status.
Fault indicator
A single red LED that lights when the hybrid current is outside the normal
operating range, the laser output power is below normal limits, or the laser
current is above normal limits. Because the laser output requires a short
period of time to stabilize, it is acceptable for the fault indicator to
illuminate during the stabilization interval (approximately 2 seconds). Note
that the module must be enabled for the fault indicator to function.
SG2440 Installation and Operation Manual
Optical Modules
4-9
SG2-DFBT Optical Transmitter
The SG2-DFBT is an isolated distributed feedback (DFB) return path optical transmitter
originally designed for use in the SG 2000 node platform. It has a nominal optical output power
of 1.0 mW and is used in conjunction with an AM-RPR, AM-OMNI-RPR/2C, or other similar
return-path optical receiver.
Figure 4-7 illustrates the SG2-DFBT:
Figure 4-7
SG2-DFBT
SG2000
Optical Transmitter
OPTICAL
POWER
(1 V/mW)
LASER
CURRENT
(1 V/A)
O
N
F
A
U
L
T
SG2-DFBT
ASSEM BLED
IN MEXICO
Table 4-5 provides information on the user-related features of the SG2-DFBT:
Table 4-5
SG2-DFBT features
Feature
Description
Optical power test point
This test point enables monitoring of the optical output level of the module.
The nominal scale factor is 1.0 V/mW. The optical power test-point voltage
is between 0.945 V through 1.055 V (optical power of 0.945 mW through
1.055 mW) when the module is enabled under normal operating
conditions. Note that the optical power test point does not track changes in
optical power due to the laser tracking error.
Laser current test point
This test point enables monitoring of the current drawn by the laser diode.
The nominal scale factor is 1.0 V/A. The laser current test point voltage is
between 5 mV through 110 mV (laser current of 5 mA through 110 mA)
when the module is enabled under normal operating conditions. The laser
current is expected to vary widely with changes in temperature, but should
always remain between the limits.
Transmitter enable
A green LED (ON) that provides visual indication of the transmitter’s enable
status.
Fault indicator
A single red LED that lights if the hybrid current is outside the normal
operating range, the laser output power is below normal limits, or the laser
current is above normal limits. Because the laser output requires a short
period of time to stabilize, it is acceptable for the fault indicator to
illuminate during the stabilization interval (approximately 2 seconds). Note
that the module must be enabled for the fault indicator to function.
SG2440 Installation and Operation Manual
4-10
Optical Modules
SG2-DFBT/3 Optical Transmitter
The SG2-DFBT/3 is an isolated distributed feedback (DFB) return path optical transmitter
originally designed for use in the SG 2000 node platform. It has a nominal optical output power
of 2.0 mW and is used in conjunction with an AM-RPR, AM-OMNI-RPR/2C, or other similar
return-path optical receiver.
Figure 4-8 illustrates the SG2-DFBT/3:
Figure 4-8
SG2-DFBT/3
SG2000
Optical Transmitter
OPTICAL
POWER
(1 V/mW)
LASER
CURRENT
(1 V/A)
O
N
F
A
U
L
T
SG2-DFBT/3
ASSEM BLED
IN MEXICO
Table 4-6 provides information on the user-related features of the SG2-DFBT/3:
Table 4-6
SG2-DFBT/3 features
Feature
Description
Optical power test point
This test point enables monitoring of the optical output level of the module.
The nominal scale factor is 1.0 V/mW. The optical power test-point voltage
is between 0.945 V through 1.055 V (optical power of 0.945 mW through
1.055 mW) when the module is enabled under normal operating
conditions. Note that the optical power test point does not track changes in
optical power due to the laser tracking error.
Laser current test point
This test point enables monitoring of the current drawn by the laser diode.
The nominal scale factor is 1.0 V/A. The laser current test point voltage is
between 5 mV through 110 mV (laser current of 5 mA through 110 mA)
when the module is enabled under normal operating conditions. The laser
current is expected to vary widely with changes in temperature, but should
always remain between the limits.
Transmitter enable
A green LED (ON) that provides visual indication of the transmitter’s enable
status.
Fault indicator
A single red LED that lights if the hybrid current is outside the normal
operating range, the laser output power is below normal limits, or the laser
current is above normal limits. Because the laser output requires a short
period of time to stabilize, it is acceptable for the fault indicator to
illuminate during the stabilization interval (approximately 2 seconds). Note
that the module must be enabled for the fault indicator to function.
SG2440 Installation and Operation Manual
Optical Modules
4-11
DS-SG2-DRT/A Digital Return Transmitter
The DS-SG2-DRT/A is an SG2 return transmitter that digitizes a single analog 5 MHz-42 MHz
return-path signal to produce a 1.6 Gbps data stream. This data stream is then routed to a
digital laser for transmission to a corresponding digital return receiver.
The transmitter can be configured with a digital laser wavelength that is applicable to the
required link length. An automatic power control (APC) system regulates the optical output
power from the laser. User-accessible input level-control adjustments enable you to adjust the
transmitter +2 dB to −13 dB from an input level of 15 dBmV. All transmitter status-monitor
information is available at the digital return receiver.
To facilitate easy upgrades, the DS-SG2-DRT/A fits the same footprint and has the same set-up
levels as the analog return transmitters.
Figure 4-9 illustrates a block diagram of the DS-SG2-DRT/A:
Figure 4-9
DS-SG2-DRT/A
Return
band RF
5-42 MHz
Serial bit
stream
@1.6 Gbps
Antialiasing
LPF
RF
XFMR
A/D
converter
Transmit
signal
processing
logic
Digital
lightwave
to SG2 output
Serializer
CATV
gain block
Optical transmitter module
VCXO
LPF
XO
Figure 4-10 illustrates the DS-SG2-DRT/A and attached cable:
DANGER
Figure 4-10
DS-SG2-DRT/A
SG2000
INPUT
A
STATUS
Digital Transmitter
DS-SG2-DRT/A
1310 DFB
Test
Point
A
SG2440 Installation and Operation Manual
4-12
Optical Modules
Table 4-7 provides information on the user-related features of the DS-SG2-DRT/A transmitters:
Table 4-7
DS-SG2-DRT/A features
Feature
Description
Test point A
This test point enables monitoring of the RF level at the input to the A/D. It
measures −20 dB from the A/D input level.
Input A
The transmitter has a digitally controlled attenuator that adjusts for
varying input levels. This push-button is an input level-control adjustment
that provides +2 to −13 dB of adjustment from an input level of 15 dBmV.
Increment attenuator setting
Short press (0.1 to 1.5 seconds). The status LED indication is green with
a short OFF blink (0.25 sec.) when the button is released. A short red
blink occurs if the increment attempts to go past the maximum.
Decrement attenuator setting
Short press (0.1 to 1.5 seconds). The status LED indication is green with
a short yellow blink (0.25 sec.) when the button is released. A short red
blink occurs if the decrement attempts to go past the minimum.
Change increment/
decrement direction
Medium press (1.5 to 5.0 seconds). The status LED is OFF after 1.5
seconds when in the increment direction, and yellow when in the
decrement direction. The LED is restored to its green or alarm state when
the button is released. No increment or decrement occurs.
Restore factory default
setting
Long press (5.0 seconds or longer). The status LED flashes green and
yellow rapidly until the button is released. After five seconds of flashing,
the factory defaults are restored.
Status
Alarms
No alarm
Over temperature (> +85°C)
Low +24 Vdc (< +18 Vdc)
Low +5 Vdc (< +4.5 Vdc)
Low +2.5 Vdc (< +2.2 Vdc)
Laser bias/optical power
out of spec.
This tri-color LED is green if all parameters are within specification. A
series of red flashes indicate an alarm condition. The number of red
flashes indicate the parameter that is outside the specification.
Status LED indication:
Steady green
Long red, one red flash (repeating)
Long red, two red flashes (repeating)
Long red, three red flashes (repeating)
Long red, five red flashes (repeating)
Long red, six red flashes (repeating)
It is recommended that you restore the factory default settings before you set up the node levels.
This procedure places the transmitter input level 2 dB below maximum.
SG2440 Installation and Operation Manual
Optical Modules
4-13
DS-SG2-DRT-2X/A Digital Return Transmitter
The DS-SG2-DRT-2X/A is an SG2 return transmitter that digitizes two independent analog
5 MHz to 42 MHz return-path signals to produce two 1.25 Gbps data streams. These two data
streams are then multiplexed to create a 2.5 Gbps data stream. This data stream is then routed
to a digital laser for transmission to a corresponding digital return receiver.
The transmitter can be configured with a digital laser wavelength that is applicable to the
required link length. An APC system regulates the optical output power from the laser. Two
user-accessible input level-control adjustments enable you to independently adjust the
transmitter input levels +2 dB to −13 dB from an input level of 15 dBmV. All transmitter
status-monitor information is available at the digital return receiver.
To facilitate easy upgrades, the DS-SG2-DRT/A fits the same footprint and has the same set-up
levels as the analog return transmitters.
Figure 4-11 illustrates a block diagram of the DS-SG2-DRT-2X/A:
Figure 4-11
DS-SG2-DRT-2X/A
Return
band RF
5-42 MHz
Antialiasing
LPF
RF
XFMR
A/D
converter
Serial bit
stream
@2.5 Gbps
CATV
gain block
VCXO
Transmit
signal
processing
logic
LPF
Return
band RF
5-42 MHz
Digital
lightwave
to SG2 output
Serializer
Optical transmitter module
Antialiasing
LPF
RF
XFMR
A/D
converter
XO
CATV
gain block
Figure 4-12 illustrates the DS-SG2-DRT-2X/A and attached cable:
DANGER
Figure 4-12
DS-SG2-DRT-2X/A
RF
INPUT
B
RF
input
B
Test
point
A
SG2000
INPUT
A
Digital Transmitter
STATUS DS-SG2-DRT-2X/A
1310 DFB
INPUT
B
Test
point
B
SG2440 Installation and Operation Manual
4-14
Optical Modules
Table 4-8 provides information on the user-related features of the DS-SG2-DRT-2X/A:
Table 4-8
DS-SG2-DRT-2X/A features
Feature
Description
RF input B
This input is the second RF return signal that is obtained from the adjacent
transmitter connector through a provided cable. The cable is illustrated in
Figure 3-17.
Test point A and B
These test points enable monitoring of the RF level at the input to the A/D. It
measures −20 dB from the A/D input level.
Input A and B
The transmitter has a digitally controlled attenuator that adjusts for varying
input levels. These push-buttons are input level-control adjustments that
provide +2 to −13 dB of adjustment from an input level of 15 dBmV. No action
is taken if both buttons are pressed.
Increment attenuator setting
Short press (0.1 to 1.5 seconds). The status LED indication is green with a
short OFF blink (0.25 sec.) when the button is released. A short red blink
occurs if the increment attempts to go past the maximum.
Decrement attenuator setting
Short press (0.1 to 1.5 seconds). The status LED indication is green with a
short yellow blink (0.25 sec.) when the button is released. A short red blink
occurs if the decrement attempts to go past the minimum.
Change increment/
decrement direction
Medium press (1.5 to 5.0 seconds). The status LED is OFF after 1.5 seconds
when in the increment direction, and yellow when in the decrement direction.
The LED is restored to its green or alarm state when the button is released.
No increment or decrement occurs.
Restore factory default
setting
Long press (5.0 seconds or longer). The status LED flashes green and yellow
rapidly until the button is released. After five seconds of flashing, the factory
defaults are restored.
Status
Alarms
No alarm
Over temperature (> +85°C)
Low +24 Vdc (< +18 Vdc)
Low +5 Vdc (< +4.5 Vdc)
Low +2.5 Vdc (< +2.2 Vdc)
Laser bias/optical power
out of spec.
This tri-color LED is green if all parameters are within specification. A series
of red flashes indicate an alarm condition. The number of red flashes indicate
the parameter that is outside the specification.
Status LED indication:
Steady green
Long red, one red flash (repeating)
Long red, two red flashes (repeating)
Long red, three red flashes (repeating)
Long red, five red flashes (repeating)
Long red, six red flashes (repeating)
It is recommended that you restore the factory default settings before you set up the node levels.
This procedure places the transmitter input level 2 dB below maximum.
SG2440 Installation and Operation Manual
Optical Modules
4-15
Figure 4-13 illustrates the DS-SG2-DRT-2X/A installed in the SG2440 with completed fiber
connections:
Figure 4-13
DS-SG2-DRT-2X/A installed in SG2440
SG2440 Installation and Operation Manual
4-16
Optical Modules
Status Monitoring
Table 4-9 identifies and describes the status monitor provisions built into the SG2440 platform.
Table 4-9
Reporting and control provisions
Parameter
Description
Power supply voltage
Converts the +24 V and +5 V outputs from power supply #1 and #2 to a scaled
dc voltage that is referenced to ground.
Power supply presence
A digital indication that is used to detect the presence of power supply #1 and
#2.
ac volts
Measures the ac voltage provided to the dc power supplies.
dc current at RF chassis
Measures the dc current that the forward hybrid draws from the +24 Vdc
supply.
dc current at optical
receiver
Measures the dc current that optical receiver A, B, or C is drawing from the
+24 Vdc supply.
Laser current
Measures the dc laser bias current for optical transmitter A or B. This is not
implemented in the digital return transmitter. The status monitor signals are
returned to the digital return receiver as part of the data stream.
Receiver optical power
Measures the optical power received by the A, B or C optical receiver.
Transmitter optical
power
Measures the optical power emitted by the A or B optical transmitter. This is
not implemented in the digital return transmitter. The status monitor signals are
returned to the digital return receiver as part of the data stream.
AGC drive level
A scaled voltage that monitors the TCU voltage (approximately 11 V at room
temperature).
RF level
Measures the RF power level that is coupled to provide an exit sample at the
RF port.
Ingress control switch
Places a dc voltage on ingress control switches #1, #2, #3, and #4 to control
their attenuation.
Optical receiver A/B
select
A digital control that facilitates the status monitors ability to control the selection
of optical receiver A or B.
Optical transmitter
enable
A digital control that enables/disables optical transmitter A or B. This is not
implemented in the digital return transmitter. The status monitor signals are
returned to the digital return receiver as part of the data stream.
SG2440 Installation and Operation Manual
Optical Modules
4-17
Manual Control Board
The SG2440 manual control board (SG2-MCB) serves to locally control redundancy functions
and ingress switch operation if a status monitor is not installed. Figure 3-1 illustrates the MCB
board mounted on the main RF board in place of the status monitor. Inputs to the MCB are the
received optical power signals from both the A and B receivers, scaled at 1 V/mW.
The MCB board contains two 3-gang, dual-in-line-package (DIP) switches and five screwdriver
adjustable potentiometers. Table 4-10 provides descriptions and functions of these
user-interface settings.
Table 4-10
MCB user-interface settings
Description
Function
Switch S1-1
Determines whether the primary/redundant reset state occurs at 0.5 dB or 1.0 dB
more than the defined optical level threshold. This hysteresis or “gap” prevents the
automatic switch-over function from “hunting” or switching back and forth if the
received optical power remains close to the switching threshold. The factory setting
is 1.0 dB.
Switch S1-2
Enables selection of either normal (NORM) or manual override (OVER) operation. In
the NORM position, switchover between the primary and secondary optical paths is
automatically controlled by the received optical power of the primary receiver. In
the OVER position, the selection is performed manually using switch S1-3. The
factory setting is NORM.
Switch S1-3
Selects either receiver A (RXA) or receiver B (RXB) as the primary optical receiver
when S1-2 is in the NORM position. With S1-2 in the OVER position, S1-3 manually
enables either receiver. The factory setting is RXA.
Switch S2-1
Selects standard slaving or cross slaving of the transmitters to the receivers. Set in
the standard slaving (STD_SLV ) position, with switch S1-2 in the NORM position,
transmitter A follows the enable/disable status of receiver A, and transmitter B that
of receiver B. Setting S2-1 to cross slaving (CRS_SLV) causes transmitter B to be on
when receiver A is enabled and transmitter A to be on when receiver B is enabled.
The factory setting is STD_SLV.
Switch S2-2
Controls the status of return transmitter A. If S1-2 is in the OVER position, S2-2
either enables transmitter A (TXA_EN) or disables transmitter A (TXA_DIS). If S1-2 is
in the NORM position, then S2-2 enables slaving of the transmitter status to the
corresponding receiver (TXA_DIS) or overrides the slaving function enabling the
transmitter to be on continuously (TXA_EN). The factory setting is TXA_DIS.
Switch S2-3
Performs the same function for transmitter B as S2-2 performs for transmitter A.
The factory setting is TXB_DIS.
Alarm potentiometer
(ALRM) sets the received optical power threshold at which automatic switchover
from the primary to the secondary path occurs. It can be set for any power level up
to 2.5 mW (+4 dBm). The factory setting is 0.25 V (–3 dBm).
Alarm test point
(ALRM TP) provides access for measuring the cross-over optical level threshold.
3 dB test point
(3 dB TP) is used to measure the optical power of the primary receiver.
Measurements at this test point are 3 dB less than the actual value.
SG2440 Installation and Operation Manual
4-18
Optical Modules
Description
Function
Potentiometers ICS1
through ICS4
Control the attenuation of the ingress control switches (ICS) when they are installed
in the return paths of the RF output ports. The factory setting is for minimum
attenuation, however, they can be set for a maximum attenuation of approximately
40 dB. The following list indicates the potentiometer and its corresponding housing
port:
ICS1
housing port IN
RF chassis port 1
ICS2
housing port 1
RF chassis port 3
ICS3
housing port out RF chassis port 2
ICS4
housing port 3
RF chassis port 4
Figure 4-14 illustrates the MCB board, switches, potentiometers, and test points:
Figure 4-14
MCB board
ICS4
ICS2
ICS3
S2
S1
SG2440 Installation and Operation Manual
ALRM
ICS1
3 dB TP
ALRM TP
Optical Modules
4-19
Ingress Control
The SG2440 platform incorporates electronic ingress control switching enabling operators to
choose one of three options for troubleshooting noise sources. A maximum of four switches, (one
ingress switch per RF port) can populate the RF amplifier. Figure 3-1 illustrates their location
on the RF chassis.
Ingress switches are controlled in one of two ways: (1) remotely — through the optional on-board
LL-SG2 transponder in communication with the status monitoring system or; (2) locally —
using the manual control board (MCB).
The three states of the switch and their functions include:
State
Description
Off
Effectively isolates the contaminated leg by adding a minimum of 40 dB attenuation.
–6 dB
Typically initiated at the headend, it provides –6 dB additional attenuation to the return signal. This
is useful in diagnosing noise presence without interfering with normal service.
On
Completes the return path without alteration to the return signal.
SG2440 Installation and Operation Manual
Section 5
Installation
Installation consists of splicing the six-fiber service cable to the transportation fiber, installing
the housing and electronics on the messenger strand, applying power, and placing the unit in
service.
To avoid excess weight and the possibility of damage during installation, the housing is
normally mounted prior to inclusion of the expensive electronic components. It is assumed that
the node components have been removed, configured, and tested on the bench and only minimal
alignment may be required following field installation.
Splicing Fiber
The service cable can be spliced to the transportation cable at any time during the node
installation. Splicing does not need to coincide with the installation of the housing.
Fusion splicing is recommended because it has low insertion loss and is the most reliable
method. A technician experienced in splicing fiber should do the splicing.
To perform fusion splicing:
1
Obtain the 50-foot service cable with the compression fitting from the node package.
Figure 5-1 illustrates this cable:
Figure 5-1
Service cable connection and compression fitting
39.8” ± 1.5”
Water Compression
seal nut
nut
2
Main
body
Service
cable
Heat
shrink
SC/APC
connectors
Splice each fiber according to procedures recommended by the manufacturer of the splicing
equipment being used. A blue-coded fiber is suggested for the forward signal distribution
and a brown-coded fiber is recommended for the return path. Cleanliness in the work area is
essential.
SG2440 Installation and Operation Manual
5-2
3
Installation
Assemble the splice enclosure following the instructions furnished with the enclosure.
CAUTION!
It is important that the connections at the headend be duplicated. If they are different from the above
recommendations, follow the scheme used for the headend connections.
4
Complete the splicing and installation of the splice enclosure. Suspend the extra cable from
the messenger using locally accepted methods. Commonly used methods include suspending
it from the messenger along its entire length, and/or fashioning a figure eight coil and
suspending it from the messenger.
If the housing is to be installed at a later time, protect the end of the service cable with the
compression fitting and the fiber connectors from dirt and moisture.
DANGER!
To avoid possible injury to personnel or damage to the equipment, remove 60/90 volt ac power from the system
before you install the node.
SG2440 Installation and Operation Manual
Installation
5-3
Strand Wire Mounting
Two strand clamps and bolt assemblies are located on a bracket attached to the top of the
housing for normal horizontal mounting below the strand. Figures 5-2 and 5-3 illustrate the
front, rear, and side views of an installed bracket:
Figure 5-2
Mounting bracket-front view
SG2440 Installation and Operation Manual
5-4
Installation
Figure 5-3
Mounting bracket-rear and side views
6
2
4
7
8
1
5
2
4
1
3
IN
OUT
3
To mount the housing to the strand wire:
1
Attach the bracket to the housing using the two 5/16 × 18 bolts.
2
Loosen the 3/8 × 16 strand clamp bolt located on each mounting bracket.
3
Engage the strand in the housing strand clamps. Do not tighten the hex-head bolts at this
time. This enables the clamps to slide along the strand wire until the housing is finally
positioned with respect to the cables.
4
Re-install all modules and electronic components that were removed before the housing was
installed.
Connections to the housing are made using standard KS-type housing port entry connectors.
Pin-type connectors with a nominal center conductor diameter of 0.067 inches are required.
Measuring from the seating plane of the connector, the center conductor pin length must be
1.50 inches minimum and 1.65 inches maximum.
SG2440 Installation and Operation Manual
Installation
5-5
Figure 5-4 illustrates the dimensions of the center conductor:
Figure 5-4
Center conductor length
1.65"Max.
1.50" Min.
There are no surge protectors over the center seizure screws and none should be installed. Adding surge protectors degrades the return
loss of the housing port.
Coaxial Cables
To install coaxial cables in the base:
1
Loosen, but do not remove, the three bolts on top of the housing and the bolt on each side of
the housing. Rotate these bolts away from the cover.
2
Swing the housing lid away from the lower housing base.
3
Remove the protective port cap(s) in the base and verify that the seizure screw within either
the trunk or feeder port is loosened to accept the center pin of the cable connector.
4
Secure the cable end in the cable connector as described in the instruction sheet for the
connector.
5
Insert the center conductor fully until it enters the seizure mechanism. Tighten the terminal
screw onto the cable connector and torque to 12 in-lbs (1 ft-lb).
6
Repeat steps 3 through 5 for all other cable connections required.
7
Protect all cable connections with heat-shrink tape or tubing.
8
Lash the cables to the strand where they approach it and secure the cable lashing wire to
the strand with commercial clamps.
9
Verify that port plugs on any unused ports are firmly seated and torqued to 5 ft-lbs.
Fiber Cables
To install fiber cables in the lid:
1
Remove the protective port plug from the side of the housing lid and carefully pass the
connector ends of the fiber service cable through this port. It is necessary to insert one
connector at a time. Be careful not to bend the fiber any more than is necessary.
2
Thread the compression fitting into the port. The compression nut and rubber grommet
must be sufficiently loose to enable the fitting to be turned without turning the fiber cable at
the same time. Torque the main body of the fitting to 60 to 72 in-lbs (5 to 6 ft-lbs).
SG2440 Installation and Operation Manual
5-6
3
Installation
Carefully dress the excess fiber into the ramp of the fiber spool tray. Wrap the fiber around
the spooling cylinder one to two times depending on the length of the fiber. The diameter of
the spool tray is matched to the bend radius of the fiber. Also ensure that the fiber is routed
under the retaining flanges and through the pegs of the fiber tray for proper routing to the
optics modules. Figures 5-5 and 5-6 illustrate the housing lid and fiber spool tray.
Figure 5-5
Housing lid and fiber spool tray
Figure 5-6
Fiber spool tray
Fiber routed to optics modules
through fiber tray pegs
4
Connect each fiber by removing the protective boot from the fiber connector, cleaning the
connector with pure isopropyl alcohol (99%) using a lint-free wipe, and drying it with filtered
compressed air. After cleaning the fiber, insert it into the appropriate receiver or
transmitter module.
SG2440 Installation and Operation Manual
Installation
5-7
5
Position the fiber service cable in the compression fitting to provide some slack in the fibers
inside the housing. Tighten the compression nut until it bottoms out. Finally, tighten the
water seal nut until there is no gap between it and the compression nut.
6
Close the housing and use a torque wrench to sequentially and progressively tighten the
housing bolts to a final torque of 12 ft-lbs. in the sequence stamped on the housing lid as
illustrated in Figure 1-1.
SG2440 Installation and Operation Manual
Appendix A
Specifications
Specifications for the SG2440 are valid over the given bandpass and operating temperature
range listed in this section. The current catalog may contain additional information not provided
below.
Table A-1 lists the optical characteristics for the SG2440 node:
Table A-1
SG2440 optical receiver characteristics
Parameter
Specification
Optical wavelength
1310 ±20 nm through 1550 ±30 nm
Received optical power
range
maximum
–3 dBm to +2 dBm (continuous)
+3 dBm
Optical input return loss
45 dB minimum
Equivalent input noise current
8 pa/Hz
Receiver minimum output level
with 0 dBm input level, 79
channel load
25 dBmV/channel
1/2
Table A-2 lists the station RF characteristics for the SG2440 node:
Table A-2
Station RF characteristics
Parameter
Specification
Forward passband frequency
47 MHz through 870 MHz (dependent upon split)
Return passband, each port
5 MHz through 80 MHz (dependent upon split)
Splits
S
J
A
K
E
M
5-40/52-870 MHz
5-55/70-870 MHz
5-65/85-870 MHz
5-42/54-870 MHz
5-30/47-870 MHz
5-80/108-870 MHz
Return loss
16 dB
Launch amplifier gain
38 dB
Gain control range
±4 dB
Flatness over passband
±0.75 dB
Operational slope (linear)
A
B
L
S
H
U
6.0 dB ±0.75 dB
8.0 dB ±0.75 dB
10.0 dB ±0.75 dB
12.5 dB ±0.75 dB
14.0 dB ±0.75 dB
16.0 dB ±0.75 dB
Launch amplifier only, typical
noise figure
12 dB
SG2440 Installation and Operation Manual
A-2
Specifications
Table A-3 lists the general characteristics for the SG2440 node:
Table A-3
SG2440 general characteristics
Parameter
Specifications
AC input voltage
38 Vac through 110 Vac quasi-squarewave
AC bypass current
15 A
Hum modulation
–70 dB @ 15 A bypass current
Operating temperature
–40°C through +60°C (–40°F through +140°F)
Housing dimensions
21.6”(L) × 10.6”(W) × 11.0”(D), (without bracket)
Weight
Minimum 36 lbs./maximum 42 lbs. (without bracket)
Table A-4 lists the current requirements for various options available in the SG2440:
Table A-4
Current requirements
SG2440
Watts
AC
power
Amps
@90V
Amps
@60V
Amps
@52V
Amps
@44V
Silicon output
68.4
1.05
1.56
1.8
2.14
Additional receiver
8.7
0.13
0.19
0.23
0.26
Status monitor
3.1
0.04
0.07
0.08
0.09
Analog return transmitters
8.6
0.22
0.33
0.38
0.45
Digital return transmitters
DS-SG2-DRT/A
DS-SG2-DRT-2X/A
4.17
8.33
0.08
0.17
0.12
0.23
0.12
0.25
0.14
0.27
Each ingress switch
1.96
0.03
0.04
0.05
0.06
MCB
1.81
0.03
0.04
0.05
0.05
Add for:
Table A-5 lists distortion and c/n performance for the SG2440 with a load of 77 channels:
Table A-5
SG2440 performance, with 77 channels
Parameter
Specification
Carrier-to-Composite Noise (CCN)
50 dB Minimum
Composite Triple Beat (CTB)
65 dBc Maximum
Composite Second Order (CSO)
65 dBc Maximum
Cross-Modulation (XMOD)
62 dB Maximum
Link: SG2-R w/ALM9, 77ch, 20km
Loss budget 9.0 dB
11.5 dB tilt 870 MHz virtual level of 50.5 dBmV
310 MHz of compressed data 6 dB below analog channel level
Output level (870, 550, 55 MHz), 44.5/46/39 dBmV
SG2440 Installation and Operation Manual
Specifications
A-3
Table A-6 lists the RF performance specifications for the SG2-FPT laser transmitter:
Table A-6
SG2-FPT RF specifications
Parameter
Specification
Nominal RF input impedance
75-ohms
RF passband
5 MHz through 65 MHz
Flatness (peak to valley)
1.00 dB maximum
RF input return loss
18 dB minimum
Recommended total input power
+15 dBmV
Noise Power Ratio over dB Input
Dynamic Range Typical
30 dB NPR over 15 dB dynamic range
Table A-7 lists the RF performance specifications for the SG2-DFBT laser transmitter:
Table A-7
SG2-DFBT RF specifications
Parameter
Specification
Nominal RF input impedance
75-ohms
RF passband
5 MHz through 200 MHz
Flatness (peak to valley)
1.00 dB maximum
RF input return loss
18 dB minimum
Recommended total input power
+15 dBmV
Noise Power Ratio over dB Input
Dynamic Range Typical
40 dB NPR over 12 dB dynamic range
Table A-8 lists the RF performance specifications for the SG2-DFBT/3 laser transmitter:
Table A-8
SG2-DFBT/3 RF specifications
Parameter
Specification
Nominal RF input impedance
75-ohms
RF passband
5 MHz through 200 MHz
Flatness (peak to valley)
1.00 dB maximum
RF input return loss
18 dB minimum
Recommended total input power
+15 dBmV
Noise Power Ratio over dB Input
Dynamic Range Typical
40 dB NPR over 15 dB dynamic range
SG2440 Installation and Operation Manual
A-4
Specifications
Table A-9 lists the RF performance specifications for the SG2-EIFPT laser transmitter:
Table A-9
SG2-EIFPT RF specifications
Parameter
Specification
Nominal RF input impedance
75-ohms
RF input passband
5 MHz through 65 MHz
Flatness (peak to valley)
1.00 dB maximum
RF input return loss
18 dB minimum
Recommended total input power
+15 dBmV
Optical output power
1 mW (1 dBm), nominal
Noise Power Ratio over dB Input
Dynamic Range Typical
40 dB NPR over 8 dB
dynamic range
Table A-10 lists the RF performance specifications for the SG2-DRT/A digital return
transmitter:
Table A-10
SG2-DRT/A RF specifications
Parameter
Specification
Nominal RF input impedance
75-ohms
RF passband
5 MHz through 42 MHz
Flatness (peak to valley)
±0.5 dB maximum
RF input return loss
15 dB minimum
Recommended total input power
+15 dBmV
Noise Power Ratio over dB Input
Dynamic Range Typical
40 dB NPR over 11 dB dynamic range
SG2440 Installation and Operation Manual
Specifications
A-5
Table A-11 lists the RF performance specifications for the SG2-DRT-2X/A digital return
transmitter:
Table A-11
SG2-DRT-2X/A RF specifications
Parameter
Specification
Nominal RF input
impedance
75-ohms
RF passband
5 MHz through 42 MHz
Flatness (peak to valley)
±0.5 dB maximum
RF input return loss
15 dB minimum
Recommended total
input power
+15 dBmV
Noise Power Ratio over
dB Input Dynamic
Range Typical
40 dB NPR over 11 dB dynamic range
Table A-12 lists the minimum optical output power ratings for each available wavelength and
transmitter model. These values are applicable for the DS-SG2-DRT/A and DS-SG2-DRT-2X/A:
Table A-12
Optical output power vs. wavelength for DS-SG2-DRT*/A transmitters
Minimum Optical Output
Power (dBm)
Model
–7
-001, DS-SG2-DRT*/A-1310-FP-SC
–2
-002, DS-SG2-DRT*/A-1310-DFB-SC
–3
-003, DS-SG2-DRT*/A-1550-DFB-SC
–3
-004, DS-SG2-DRT*/A-1510c-DFB-SC
–3
-005, DS-SG2-DRT*/A-1530c-DFB-SC
–3
-006, DS-SG2-DRT*/A-1550c-DFB-SC
–3
-007, DS-SG2-DRT*/A-1570c-DFB-SC
–3
(average power w/randomized data pattern
in all cases)
-008, DS-SG2-DRT*/A-1470cDFB-SC
–3
-009, DS-SG2-DRT*/A-1490c
–3
-010, DS-SG2-DRT*/A-1590c
–3
-011, DS-SG2-DRT*/A-1610c
SG2440 Installation and Operation Manual
Appendix B
Torque Specifications
Torque specifications are valid for all models of the SG2440 node.
Torque
Fastener
Screw Size
Wrench Size
In-lbs
Ft-lbs
N-m
Strand clamp/pedestal
mounting
5/16-18
1/2 inch
120-144
10-12
13.6-16.3
Housing/lid closure
5/16-18
1/2 inch
144
12
16.3
External/internal port plugs
5/8-24
1/2 inch
25-40
2.1-3.3
2.8-4.5
Seizure screw
#8-32
3/16 inch
11-12
0.9-1.0
1.2-1.4
Hybrid
#6-32
Phillips
15-17
1.2-1.4
1.7-1.9
Chassis (E-pack)
#10-32
5/16 inch
18-22
1.5-1.8
2.0-2.4
Chassis cover
#6-32
¼ inch
15-17
1.2-1.4
1.7-1.9
Return path modules
#6-32
¼ inch
15-17
1.2-1.4
1.7-1.9
Return path module cover
#6-32
¼ inch
15-17
1.2-1.4
1.7-1.9
Power interconnect cable
#4-40
slotted
4-6
0.3-0.5
0.5-0.7
Optical modules
#10-32
5/16 inch
18-22
1.5-1.8
2.0-2.4
Power supplies
#10-32
5/16 inch
10-12
0.8-1.0
1.1-8.1
Service cable fitting into
housing
5/8-24
¾ inch
60-72
5-6
6.8-8.1
SG2440 Installation and Operation Manual
Abbreviations and Acronyms
The abbreviations and acronyms list contains the full spelling of the short forms used in this
manual.
A
ampere
ac
alternating current
A/D
analog-to-digital
ADU
automatic drive unit
AGC
automatic gain control
APC
angled physical contact
BW
bandwidth
CATV
Community Antenna Television
c/n
carrier-to-noise ratio
CSO
composite second order
CTB
composite triple beat
CU
control unit
dB
decibel
dBc
decibels relative to the carrier
dBm
decibels relative to 1 milliwatt
dBmV
decibels relative to 1 millivolt
dc
direct current
DFB
distributed feedback
DIP
dual in-line package
FC
ferrule connector
FM
frequency modulation
FTEC
fast transfer electronic crowbar
GBPS
Gigabytes per second
IC
integrated circuit
I/O
input/output
ICS
ingress control switch
km
kilometer
MCB
manual control board
MHz
megahertz
µW
microwatt
mA
milliamp
mW
milliwatt
NTSC
National Television Standards Committee
SG2440 Installation and Operation Manual
Abbreviations and Acronyms-2
OMI
optical modulation index
P-V
Peak-to-valley
pA
picoampere
PIC
power interconnect cable
RF
radio frequency
RIN
relative intensity noise
RSA
return for service authorization
SC
snap connector
TCU
thermal control unit
V
volt
VCXO
voltage controlled crystal oscillator
XO
crystal oscillator
SG2440 Installation and Operation Manual
495166-001
5/02
MGBI