Cisco GS7000 User Manual
Cisco 1.2 GHz GS7000 Node
Installation and Operation Guide
For Your Safety
You may find this symbol in the document that accompanies this product.
This symbol indicates important operating or maintenance instructions.
You may find this symbol affixed to the product. This symbol indicates a live
terminal where a dangerous voltage may be present; the tip of the flash points
to the terminal device.
You may find this symbol affixed to the product. This symbol indicates a
protective ground terminal.
You may find this symbol affixed to the product. This symbol indicates a
chassis terminal (normally used for equipotential bonding).
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potentially hot surface.
You may find this symbol affixed to the product and in this document. This
symbol indicates an infrared laser that transmits intensity-modulated light
and emits invisible laser radiation or an LED that transmits
intensity-modulated light.
Explanation of Warning and Caution Icons
Avoid personal injury and product damage! Do not proceed beyond any symbol
until you fully understand the indicated conditions.
The following warning and caution icons alert you to important information about
the safe operation of this product:
Important
Please read this entire guide. If this guide provides installation or operation
instructions, give particular attention to all safety statements included in this guide.
Notices
Trademark Acknowledgments
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its
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URL: http://www.cisco.com/go/trademarks.
Third party trademarks mentioned are the property of their respective owners.
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Cisco and any other company. (1110R)
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Cisco Systems, Inc. assumes no responsibility for errors or omissions that may
appear in this publication. We reserve the right to change this publication at any
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implication, estoppel, or otherwise any license or right under any copyright or
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invention claimed in any existing or later issued patent.
Copyright
© 2015 Cisco and/or its affiliates. All rights reserved. Printed in the United States of
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Cisco Systems, Inc.
iii
Contents
For Your Safety ......................................................................................................................... 3
Notices ....................................................................................................................................... 4
Important Safety Instructions.............................................................................................. vii
Laser Safety ............................................................................................................................xiii
Laser Warning Labels ............................................................................................................ xv
General Information 1
Equipment Description ........................................................................................................... 2
Theory of Operation 15
System Diagrams ................................................................................................................... 17
Forward Path .......................................................................................................................... 21
Reverse Path ........................................................................................................................... 22
Power Distribution ................................................................................................................ 23
RF Amplifier Module ............................................................................................................ 24
Forward Configuration Module .......................................................................................... 29
Reverse Configuration Module ............................................................................................ 34
Optical Interface Board (OIB) ............................................................................................... 38
Optical Receiver Module ...................................................................................................... 39
Optical Analog Transmitter Modules ................................................................................. 43
Optical Amplifier (EDFA) Modules .................................................................................... 45
Optical Switch Module .......................................................................................................... 52
Local Control Module ........................................................................................................... 58
Power Supply Module .......................................................................................................... 61
Installation 65
Tools and Test Equipment .................................................................................................... 66
Node Housing Ports .............................................................................................................. 68
Strand Mounting the Node ................................................................................................... 69
Pedestal or Wall Mounting the Node ................................................................................. 72
Fiber Optic Cable Installation .............................................................................................. 74
RF Cable Installation ............................................................................................................. 82
Applying Power to the Node ............................................................................................... 85
Setup and Operation 89
Tools and Test Equipment .................................................................................................... 90
System Diagrams ................................................................................................................... 91
Forward Path Setup Procedure ............................................................................................ 97
Contents
iv
Reverse Path Setup Procedure ........................................................................................... 101
Reconfiguring Forward Signal Routing ............................................................................ 103
Reconfiguring Reverse Signal Routing ............................................................................. 113
Maintenance 121
Opening and Closing the Housing .................................................................................... 122
Preventative Maintenance .................................................................................................. 124
Removing and Replacing Modules ................................................................................... 127
Care and Cleaning of Optical Connectors ........................................................................ 134
Troubleshooting 139
No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is
off ........................................................................................................................................... 140
No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on 142
Poor C/N Performance ....................................................................................................... 144
Poor Distortion Performance .............................................................................................. 146
Poor Frequency Response ................................................................................................... 148
No RF Output from Reverse Receiver .............................................................................. 150
Customer Support Information 151
Appendix A Technical Information 153
Linear Tilt Chart ................................................................................................................... 154
Forward Equalizer Chart .................................................................................................... 156
Appendix B Enhanced Digital Return Multiplexing Applications 158
Enhanced Digital Return System Overview .................................................................... 159
Enhanced Digital Return (EDR) System Installation ...................................................... 177
Transmitter Module Setup Procedure .............................................................................. 186
Reverse Balancing the Node with EDR ............................................................................ 189
Troubleshooting ................................................................................................................... 192
Appendix C Expanded Fiber Tray 197
Expanded Fiber Tray Overview......................................................................................... 198
Expanded Fiber Tray Installation ...................................................................................... 200
Fiber Management System ................................................................................................. 203
Configuration Examples ..................................................................................................... 209
Contents
v
Glossary 213
Index 225
Important Safety Instructions
vii
Important Safety Instructions
WARNING:
To reduce risk of electric shock, perform only the instructions that are
included in the operating instructions. Refer all servicing to qualified service
personnel only.
Read and Retain Instructions
Carefully read all safety and operating instructions before operating this equipment,
and retain them for future reference.
Follow Instructions and Heed Warnings
Follow all operating and use instructions. Pay attention to all warnings and cautions
in the operating instructions, as well as those that are affixed to this equipment.
Terminology
The terms defined below are used in this document. The definitions given are based
on those found in safety standards.
Service Personnel - The term service personnel applies to trained and qualified
individuals who are allowed to install, replace, or service electrical equipment. The
service personnel are expected to use their experience and technical skills to avoid
possible injury to themselves and others due to hazards that exist in service and
restricted access areas.
User and Operator - The terms user and operator apply to persons other than service
personnel.
Ground(ing) and Earth(ing) - The terms ground(ing) and earth(ing) are synonymous.
This document uses ground(ing) for clarity, but it can be interpreted as having the
same meaning as earth(ing).
Electric Shock Hazard
This equipment meets applicable safety standards.
Electric shock can cause personal injury or even death. Avoid direct contact with
dangerous voltages at all times.
Know the following safety warnings and guidelines:
Only qualified service personnel are allowed to perform equipment installation
Important Safety Instructions
viii
or replacement.
WARNING:
Avoid personal injury and damage to this equipment. An unstable mounting
surface may cause this equipment to fall.
CAUTION:
Be aware of the size and weight of strand-mounted equipment during the
installation operation.
Ensure that the strand can safely support the equipment’s weight.
WARNING:
Avoid the possibility of personal injury. Ensure proper handling/lifting
techniques are employed when working in confined spaces with heavy
equipment.
Only qualified service personnel are allowed to remove chassis covers and access
any of the components inside the chassis.
Equipment Placement
To protect against equipment damage or injury to personnel, comply with the
following:
Install this equipment in a restricted access location (access restricted to service
personnel).
Make sure the mounting surface or rack is stable and can support the size and
weight of this equipment.
Strand (Aerial) Installation
Pedestal, Service Closet, Equipment Room or Underground Vault
Installation
Ensure this equipment is securely fastened to the mounting surface or rack
where necessary to protect against damage due to any disturbance and
subsequent fall.
Ensure the mounting surface or rack is appropriately anchored according to
manufacturer’s specifications.
Ensure the installation site meets the ventilation requirements given in the
equipment’s data sheet to avoid the possibility of equipment overheating.
Ensure the installation site and operating environment is compatible with the
equipment’s International Protection (IP) rating specified in the equipment’s data
sheet.
Important Safety Instructions
ix
Connection to Network Power Sources
CAUTION:
RF connectors and housing seizure assemblies can be damaged if shunts are
not removed from the equipment before installing or removing modules from
the housing.
WARNING:
Avoid electric shock! Opening or removing this equipment’s cover may
expose you to dangerous voltages.
CAUTION:
These servicing precautions are for the guidance of qualified service
personnel only. To reduce the risk of electric shock, do not perform any
servicing other than that contained in the operating instructions unless you
are qualified to do so. Refer all servicing to qualified service personnel.
Refer to this equipment’s specific installation instructions in this manual or in
companion manuals in this series for connection to network ferro-resonant AC
power sources.
AC Power Shunts
AC power shunts may be provided with this equipment.
Important: The power shunts (where provided) must be removed before installing
modules into a powered housing. With the shunts removed, power surge to the
components and RF-connectors is reduced.
Equipotential Bonding
If this equipment is equipped with an external chassis terminal marked with the IEC
60417-5020 chassis icon ( ), the installer should refer to CENELEC standard EN
50083-1 or IEC standard IEC 60728-11 for correct equipotential bonding connection
instructions.
General Servicing Precautions
Be aware of the following general precautions and guidelines:
Servicing - Servicing is required when this equipment has been damaged in any
way, such as power supply cord or plug is damaged, liquid has been spilled or
objects have fallen into this equipment, this equipment has been exposed to rain
or moisture, does not operate normally, or has been dropped.
Important Safety Instructions
x
Wristwatch and Jewelry - For personal safety and to avoid damage of this
equipment during service and repair, do not wear electrically conducting objects
such as a wristwatch or jewelry.
Lightning - Do not work on this equipment, or connect or disconnect cables,
during periods of lightning.
Labels - Do not remove any warning labels. Replace damaged or illegible
warning labels with new ones.
Covers - Do not open the cover of this equipment and attempt service unless
instructed to do so in the instructions. Refer all servicing to qualified service
personnel only.
Moisture - Do not allow moisture to enter this equipment.
Cleaning - Use a damp cloth for cleaning.
Safety Checks - After service, assemble this equipment and perform safety
checks to ensure it is safe to use before putting it back into operation.
Electrostatic Discharge
Electrostatic discharge (ESD) results from the static electricity buildup on the human
body and other objects. This static discharge can degrade components and cause
failures.
Take the following precautions against electrostatic discharge:
Use an anti-static bench mat and a wrist strap or ankle strap designed to safely
ground ESD potentials through a resistive element.
Keep components in their anti-static packaging until installed.
Avoid touching electronic components when installing a module.
Batteries
This product may contain batteries. Special instructions apply regarding the safe use
and disposal of batteries:
Safety
Insert batteries correctly. There may be a risk of explosion if the batteries are
incorrectly inserted.
Do not attempt to recharge ‘disposable’ or ‘non-reusable’ batteries.
Please follow instructions provided for charging ‘rechargeable’ batteries.
Replace batteries with the same or equivalent type recommended by
manufacturer.
Important Safety Instructions
xi
Do not expose batteries to temperatures above 100°C (212°F).
Disposal
The batteries may contain substances that could be harmful to the environment
Recycle or dispose of batteries in accordance with the battery manufacturer’s
instructions and local/national disposal and recycling regulations.
The batteries may contain perchlorate, a known hazardous substance, so special
handling and disposal of this product might be necessary. For more information
about perchlorate and best management practices for perchlorate-containing
substance, see www.dtsc.ca.gov/hazardouswaste/perchlorate.
Modifications
This equipment has been designed and tested to comply with applicable safety, laser
safety, and EMC regulations, codes, and standards to ensure safe operation in its
intended environment. Refer to this equipment's data sheet for details about
regulatory compliance approvals.
Do not make modifications to this equipment. Any changes or modifications could
void the user’s authority to operate this equipment.
Modifications have the potential to degrade the level of protection built into this
equipment, putting people and property at risk of injury or damage. Those persons
making any modifications expose themselves to the penalties arising from proven
non-compliance with regulatory requirements and to civil litigation for
compensation in respect of consequential damages or injury.
Accessories
Use only attachments or accessories specified by the manufacturer.
Electromagnetic Compatibility Regulatory Requirements
This equipment meets applicable electromagnetic compatibility (EMC) regulatory
requirements. Refer to this equipment's data sheet for details about regulatory
compliance approvals. EMC performance is dependent upon the use of correctly
shielded cables of good quality for all external connections, except the power source,
when installing this equipment.
Ensure compliance with cable/connector specifications and associated
installation instructions where given elsewhere in this manual.
Important Safety Instructions
xii
EMC Compliance Statements
Where this equipment is subject to USA FCC and/or Industry Canada rules, the
following statements apply:
FCC Statement for Class A Equipment
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 this 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 instruction 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 users will be required to
correct the interference at their own expense.
Industry Canada - Industrie Canadiene Statement
This apparatus complies with Canadian ICES-003.
Cet appareil est confome à la norme NMB-003 du Canada.
CENELEC/CISPR Statement with Respect to Class A Information Technology Equipment
This is a Class A equipment. In a domestic environment this equipment may cause
radio interference in which case the user may be required to take adequate
measures.
Laser Safety
xiii
Laser Safety
WARNING:
Avoid personal injury! Use of controls, adjustments, or procedures other
than those specified herein may result in hazardous radiation exposure.
Avoid personal injury! The laser light source on this equipment (if a
transmitter) or the fiber cables connected to this equipment emit invisible
laser radiation. Avoid direct exposure to the laser light source.
Avoid personal injury! Viewing the laser output (if a transmitter) or fiber
cable with optical instruments (such as eye loupes, magnifiers, or
microscopes) may pose an eye hazard.
WARNING:
Avoid personal injury! Qualified service personnel may only perform the
procedures in this manual. Wear safety glasses and use extreme caution when
handling fiber optic cables, particularly during splicing or terminating
operations. The thin glass fiber core at the center of the cable is fragile when
exposed by the removal of cladding and buffer material. It easily fragments
into glass splinters. Using tweezers, place splinters immediately in a sealed
waste container and dispose of them safely in accordance with local
regulations.
Introduction
This equipment contains an infrared laser that transmits intensity-modulated light
and emits invisible radiation.
Warning: Radiation
Do not apply power to this equipment if the fiber is unmated or unterminated.
Do not stare into an unmated fiber or at any mirror-like surface that could reflect
light emitted from an unterminated fiber.
Do not view an activated fiber with optical instruments (e.g., eye loupes,
magnifiers, microscopes).
Use safety-approved optical fiber cable to maintain compliance with applicable
laser safety requirements.
Warning: Fiber Optic Cables
Laser Safety
xiv
Safe Operation for Software Controlling Optical Transmission
WARNING:
Ensure that all optical connections are complete or terminated before
using this equipment to remotely control a laser device. An optical or laser
device can pose a hazard to remotely located personnel when operated
without their knowledge.
Allow only personnel trained in laser safety to operate this software.
Otherwise, injuries to personnel may occur.
Restrict access of this software to authorized personnel only.
Install this software in equipment that is located in a restricted access area.
Equipment
If this manual discusses software, the software described is used to monitor and/or
control ours and other vendors’ electrical and optical equipment designed to
transmit video, voice, or data signals. Certain safety precautions must be observed
when operating equipment of this nature.
For equipment specific safety requirements, refer to the appropriate section of the
equipment documentation.
For safe operation of this software, refer to the following warnings.
Laser Warning Labels
xv
Laser Warning Labels
Output
Power
Maximum
Output
CDRH
Classification
IEC 60825-1
Classification
IEC 60825-2
Hazard Level
17 dBm
17 dBm
1
1M
1M
20 dBm
20 dBm
1
1M
1M
22 dBm
22 dBm
1
1M
3B
Maximum Laser Power
The maximum laser power that can be expected from the EDFA optical amplifier for
various amplifier configurations is defined in the following table.
Warning Labels
One or more of the labels shown below are located on this product.
Laser Warning Labels
xvi
Location of Labels on Equipment
The following illustrations display the location of warning labels on this equipment.
Laser Warning Labels
xvii
1
Introduction
This manual describes the installation and operation of the 1.2 GHz
GS7000 Node.
1 Chapter 1
General Information
In This Chapter
Equipment Description .......................................................................... 2
Chapter 1 General Information
2
Equipment Description
Overview
This section contains a physical and functional description of the 1.2 GHz GS7000
Node.
Physical Description
The 1.2 GHz GS7000 Node is the latest generation 1.2 GHz optical node platform
which uses the housing developed for the GS7000 Node Platform, but it has been
painted for improved thermal performance. The housing has a hinged lid to allow
access to the internal electrical and optical components. The housing also has
provisions for strand, pedestal, or wall mounting.
Note: The 1.2 GHz GS7000 node is painted white, and the pictures in this document
which use unpainted housings are used as references.
The base of the housing contains:
an RF amplifier module
AC power routing
forward and reverse configuration modules (configuration will vary)
The lid of the housing contains:
a fiber management tray and track (included in all nodes)
optical receiver and transmitter modules (configuration will vary)
EDFA (erbium-doped fiber amplifier) modules and optical switch modules
(for hub node application)
power supplies (one or two)
a status monitor/local control module (optional)
Not every 1.2 GHz GS7000 Node contains all of these modules. The 1.2 GHz GS7000
Node is a versatile node that can be configured to meet various network
requirements.
Equipment Description
3
The following illustration shows the external housing of the 1.2 GHz GS7000 Node.
Chapter 1 General Information
4
The following illustration shows the 1.2 GHz GS7000 Node internal modules and
components.
Functional Description
Node
The 1.2 GHz GS7000 Node is used in broadband hybrid fiber/coax (HFC) networks.
It is configured with the receivers, transmitters, configuration modules, and other
modules to meet your unique network requirements. This platform allows
independent segmentation and redundancy for both the forward and reverse paths
in a reliable, cost-effective package.
Equipment Description
5
The 1.2 GHz GS7000 Node receives forward optical inputs, converts the input to an
electrical radio frequency (RF) signal, and outputs the RF signals at up to six ports.
The forward bandwidth is from 54 MHz (or 86, 102, 258 MHz) to 1218 MHz. The
lower edge of the passband is primarily determined by the diplex filter and the
reverse amplifier assembly. Diplex filter choices are 54 MHz, 86 MHz, 102 MHz, and
258 MHz.
The forward path of the 1.2 GHz GS7000 Node can be deployed with a broadcast
1310/1550 nm optical receiver with common services distributed to either four
output ports (all high level) or six output ports (two high level and four lower level).
The forward path can also be segmented by using one optical receiver that feeds all
output ports, two independent optical receivers that each feed half of the node’s
output ports (left/right segmentation) or four independent optical receivers that
feed four independent forward paths. Forward optical path redundancy is
supported via the use of optional local control module. The type of forward
segmentation and/or redundancy is determined by the type of RF amplifier
assembly and Forward Configuration Module installed in the node.
The 1.2 GHz GS7000 Node’s reverse path is equally flexible. Reverse traffic can be
segmented or combined and routed to up to four DFB reverse optical transmitters, or
up to four Enhanced Digital Return reverse optical transmitters as part of our EDR
system. Redundant (back-up) transmitters may be utilized. In addition, an auxiliary
input path is provided for reverse signal injection (5 - 210 MHz). Reverse
segmentation and/or redundancy are determined by the type of Reverse
Configuration Module installed in the node.
The 1.2 GHz GS7000 Node accepts Optical Transmitter Modules based on the
existing 694x/GainMaker optical transmitters. Reverse optical transmitters can be
installed to transmit data, video, or both. Reverse bandwidth is determined by the
diplex filter and the reverse amplifier assembly. Diplex filter choices are 42/54 MHz,
65/86 MHz, 85/102 MHz, and 204/258 MHz.
The 1.2 GHz GS7000 Node utilizes the transmitter and receiver module covers that
have been designed to allow fiber pigtails storage within them, providing improved
fiber management within the node.
Up to four optical receivers and up to four analog or two digital transmitters can be
installed in the 1.2 GHz GS7000 Node.
45 - 90 V AC input power is converted to +24.5, +8.5, -6.0, and +5.5 V DC by an
internal power supply to power the 1.2 GHz GS7000 Node.
Hub Node
The GS7000 Hub Node performs the same functions as the GS7000 Node with the
added benefit of also providing optical gain and optical switching capability. The
hub node allows you to push fiber deeper into your network while taking advantage
Chapter 1 General Information
6
of the RF plant that is already in place.
The GS7000 Node can be upgraded to a GS7000 Hub Node in the field. This is
accomplished by the installation of optical amplification (EDFA) modules, optical
switching modules, and the Status Monitor/Local Control Module in the node lid.
The GS7000 Hub Node can then serve as a traditional node feeding the local HFC
plant and as an optical hub with the optical amplifiers. The node hub with the
amplifiers can service up to 32 nodes at a distance of 50 km with only three fibers.
EDFAs are available in 17 dBm, 20 dBm, and 22 dBm for broadcast constant output
power. A 17 dBm, 20 dBm and 21 dBm narrowcast constant gain EDFA version is
available to fit any architecture for requirements like DWDM narrowcasting.
The optical switch module is used for switching the input of an EDFA module from
a primary signal to a backup or secondary signal. The switch is monitored and
controlled by the Status Monitor/Local Control Module (SM/LCM) in the node.
A specific model of the SM/LCM is required for use in the hub node. This SM/LCM
model monitors and controls several EDFA and optical switch parameters and
functions while continuing to monitor the standard node components.
Features
The 1.2 GHz GS7000 Node has the following features:
Six port 1.2 GHz RF platform
Uses rugged GaN Technology on the output stage
Uses standard GainMaker style accessories (i.e., attenuator pads, equalizers,
diplexers and crowbar)
Field accessible plug-in Forward Interstage Linear Equalizers,
Forward/Reverse Configuration Modules, and Node Signal Directors
3-state reverse switch (on/off/-6 dB) allows each reverse input to be isolated
for noise and ingress troubleshooting (status monitor or local control module
required)
Auxiliary reverse injection (5 - 210 MHz) configurable on up to 2 ports (port 3
or port 6)
Positions for up to 4 optical receivers and 4 optical transmitters in housing lid
Provides hub node functionality with addition of available optical amplifier
and optical switch modules
Optional low-cost Local Control Module may be installed in conjunction with
a Redundant Forward Configuration Module to allow optical forward path
Equipment Description
7
redundancy when no status monitor is present
Fiber entry ports on both ends of housing lid
Fiber management tray and track provides easy access to fiber connections
Primary and redundant power supplies with passive load sharing
Spring loaded seizure assemblies allow coax connectors to be installed or
removed without removing amplifier chassis or spring loaded mechanism
from the rear of the housing base
Dual/Split AC powering
Space provided for mounting WDM modules inside the housing lid.
Node Inputs/Outputs Diagram
The following diagram shows the system-level inputs and outputs of the 1.2 GHz
GS7000 Node.
The AC can be applied to any RF port and routed, if required, to the other
ports.
The DC power supply modules can be fed by any RF port (1 through 6).
Modules Functional Descriptions
This table briefly describes each module. The 1.2 GHz GS7000 Node may not contain
all these modules. See Theory of Operation (on page 15) for detailed descriptions of
the modules.
Chapter 1 General Information
8
Module
Description
RF Amplifier
The RF Amplifier Module includes:
four separate and independent forward amplification paths, each
having one or two RF outputs.
four independent reverse inputs.
forward and reverse bandwidths that are established by diplexer
and reverse amplifier assembly selection.
Forward
Configuration
There are several types of this module.
The 1x4 Forward Configuration Module (FCM) is used when the 1.2
GHz GS7000 Node is configured with a single optical receiver routed
to all four outputs of the amplifiers. This module splits the signals
equally to the inputs of the RF amplifier module. The 1x4 Forward
Configuration Modules with forward RF injection are similar to the
1x4 Forward Configuration Modules, but are used with the Forward
Local Injection (FLI) Module. The FLI Module routes an RF signal
from an external source to the Forward Configuration Module which
is then coupled with other inputs from an optical receiver.
The 1x4 Redundant Forward Configuration Module is used when the
1.2 GHz GS7000 Node is configured with two optical receivers routed
to all four outputs of the amplifiers in a redundant configuration.
Receiver 1 is the primary receiver and Receiver 2 is the backup. The
active receiver is selected with a status monitor or local control
monitor.
Equipment Description
9
Module
Description
Forward
Configuration
(cont'd)
The 1x4 Redundant Forward Configuration Modules with forward RF
injection are similar to the 1x4 Redundant Forward Configuration
Modules, but are used with the Forward Local Injection (FLI) Module.
The FLI Module routes an RF signal from an external source to the
Forward Configuration Module which is then coupled with other
inputs from an optical receiver.
The 2x4 Forward Configuration Module is used when the 1.2 GHz
GS7000 Node is configured with two optical receivers, each feeding
two/three outputs of the amplifier module. In this configuration, the
node serving area is divided in half in the forward direction. Receiver
1 is routed to RF amplifier Ports 4 and 5/6, while Receiver 3 is routed
to RF amplifier Ports 1 and 2/3.
The 2x4 Redundant Forward Configuration Module is used when the
GS7000 Node is configured with four optical receivers with each pair
feeding two/three RF outputs of the amplifier module in a redundant
configuration. In this configuration, the node serving area is divided
in half, with redundancy, in the forward direction. Receivers 1
(primary) and 2 (redundant) are routed to RF amplifier Ports 4 and
5/6, while Receivers 3 (primary) and 4 (redundant) are routed to RF
amplifier Ports 1 and 2/3. The active receiver is selected with a status
monitor or local control monitor.
The 3x4 Forward Configuration Module is used when the 1.2 GHz
GS7000 Node is configured with three receivers each feeding
one/two/three/four outputs of the amplifier module. Two versions of
this module are available. In one version Receiver 1 is routed to RF
amplifier ports 4/5/6, Receiver 3 is routed to port 1, and Receiver 4 is
routed to ports 2/3. In the other version Receiver 1 is routed to RF
amplifier ports 5/6, Receiver 2 is routed to port 4, and Receiver 4 is
routed to ports 1/2/3. (Note that the 3x4 FCM can only be used with
the 4-way RF amplifier module.)
The 4x4 Forward Configuration Module is used when the 1.2 GHz
GS7000 Node is configured with four optical receivers with each
feeding separate RF outputs of the amplifier module. Receiver 1 is
routed to RF amplifier Ports 5/6. Receiver 2 is routed to RF amplifier
Port 4. Receiver 3 is routed to RF amplifier Port 1. Receiver 4 is routed
to RF amplifier Ports 2/3. (Note that the 4x4 FCM can only be used
with the 4-way RF amplifier module.)
Chapter 1 General Information
10
Module
Description
Reverse
Configuration
There are several types of this module.
The 4x1 Reverse Configuration Module (RCM) with auxiliary
reverse RF injection combines all four reverse RF inputs (Ports 1, 2/3,
4, and 5/6) of the node and routes the signal to Transmitter 1. An RF
signal from an external source can optionally be injected and coupled
with the reverse RF inputs on Ports 3/6 and routed to Transmitter 1.
The 4x1 Redundant Reverse Configuration Module combines all four
reverse RF signals (Ports 1, 2/3, 4 and 5/6) together, splits this RF
signal and routes it to Transmitters 1 and 2.
The 4x2 Reverse Configuration Module with auxiliary reverse RF
injection combines reverse inputs from Ports 1 and 2/3 and routes
them to Transmitter 1; it also combines reverse inputs from Ports 4
and 5/6 and routes them to Transmitter 3. An RF signal from an
external source can optionally be injected and coupled with reverse RF
inputs from Ports 3/6 and routed to Transmitter 1.
The 4x2 Redundant Reverse Configuration Module combines reverse
inputs from Ports 1 and 2/3 and routes them to Transmitters 1 and 2;
it also combines reverse inputs from Ports 4 and 5/6 and routes them
to Transmitters 3 and 4.
The 4x3 Reverse Configuration Module with auxiliary reverse RF
injection is available in two types. The
left-combined/right-segmented version combines reverse inputs from
Ports 1 and 2/3 and routes them to Transmitter 1; it also routes reverse
inputs from Port 4 to Transmitter 3 and from Ports 5/6 to Transmitter
4. An RF signal from an external source can optionally be injected at
Ports 3/6 and coupled with the reverse RF input from Port 1 and
routed to Transmitter 1. The left-segmented/right-combined version
combines reverse inputs from Ports 4 and 5/6 and routes them to
Transmitter 4; it also routes reverse inputs from Port 1 to Transmitter 1
and from Ports 2/3 to Transmitter 2. An RF signal from an external
source can optionally be injected at Ports 3/6 and coupled with the
reverse RF inputs from Ports 2/3 and 1 and routed to Transmitter 1.
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