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Cisco 1.2 GHz GS7000 Node
Installation and Operation Guide

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  • Page 1

    Cisco 1.2 GHz GS7000 Node Installation and Operation Guide...

  • Page 3: For Your Safety

    For Your Safety 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: You may find this symbol in the document that accompanies this product.

  • Page 4: Notices

    Trademark Acknowledgments Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: http://www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners.

  • Page 5: Table Of Contents

    Contents For Your Safety ......................... 3 Notices ............................4 Important Safety Instructions....................vii Laser Safety ..........................xiii Laser Warning Labels ......................xv General Information Equipment Description ......................2 Theory of Operation System Diagrams ........................17 Forward Path .......................... 21 Reverse Path ........................... 22 Power Distribution ........................

  • Page 6

    Contents Reverse Path Setup Procedure ................... 101 Reconfiguring Forward Signal Routing ................103 Reconfiguring Reverse Signal Routing ................113 Maintenance Opening and Closing the Housing ..................122 Preventative Maintenance ....................124 Removing and Replacing Modules ................... 127 Care and Cleaning of Optical Connectors ................ 134 Troubleshooting No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off ............................

  • Page 7

    Contents Glossary Index...

  • Page 9: Important Safety Instructions

    Important Safety Instructions Important Safety Instructions 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.

  • Page 10

    Important Safety Instructions or replacement. Only qualified service personnel are allowed to remove chassis covers and access  any of the components inside the chassis. Equipment Placement WARNING: Avoid personal injury and damage to this equipment. An unstable mounting surface may cause this equipment to fall. 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...

  • Page 11

    Important Safety Instructions Connection to Network Power Sources 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.

  • Page 12: Electrostatic Discharge

    Important Safety Instructions 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, ...

  • Page 13

    Important Safety Instructions 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 ...

  • Page 14

    Important Safety Instructions 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.

  • Page 15: Laser Safety

    Laser Safety Laser Safety Introduction This equipment contains an infrared laser that transmits intensity-modulated light and emits invisible radiation. Warning: Radiation WARNING:  Avoid personal injury! Use of controls, adjustments, or procedures other than those specified herein may result in hazardous radiation exposure. ...

  • Page 16

    Laser Safety Safe Operation for Software Controlling Optical Transmission 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.

  • Page 17: Laser Warning Labels

    Laser Warning Labels Laser Warning Labels 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. Output Maximum CDRH IEC 60825-1 IEC 60825-2 Power Output Classification Classification...

  • Page 18

    Laser Warning Labels Location of Labels on Equipment The following illustrations display the location of warning labels on this equipment.

  • Page 19

    Laser Warning Labels xvii...

  • Page 21: General Information

    Chapter 1 General Information Introduction This manual describes the installation and operation of the 1.2 GHz GS7000 Node. In This Chapter  Equipment Description ................2...

  • Page 22: Equipment Description

    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.

  • Page 23

    Equipment Description The following illustration shows the external housing of the 1.2 GHz GS7000 Node.

  • Page 24: Functional Description

    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...

  • Page 25

    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).

  • Page 26

    Chapter 1 General Information 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.

  • Page 27

    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...

  • Page 28

    Configuration 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...

  • Page 29

    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.

  • Page 30

    Chapter 1 General Information Module Description There are several types of this module. Reverse Configuration 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.

  • Page 31

    Equipment Description Module Description Reverse The 4x4 Reverse Configuration Module with auxiliary reverse RF Configuration injection routes reverse inputs from Port 1 to Transmitter 1, from Port 2/3 to Transmitter 2, from Port 4 to Transmitter 3, and from Port 5/6 (cont'd) to Transmitter 4.

  • Page 32

    The 1.2 GHz GS7000 power supply module has multiple output voltages of +24.5, +8.5, -6.0, and +5.5 V DC. A second power supply can be installed in the node for redundancy or load sharing. The 1.2 GHz GS7000 Node can be set up in the following powering configurations: ...

  • Page 33

    Ordering Information The 1.2 GHz GS7000 Node is available in a wide variety of configurations. Please refer to the 1.2 GHz GS7000 Node Data Sheet for a full listing of the configured node, components, and accessories that are available. Note: Please consult with your Account Representative, Customer Service Representative, or System Engineer to determine the best configuration PID for your particular application.

  • Page 35: Theory Of Operation

    This chapter describes the theory of operation for the 1.2 GHz GS7000 Node, including functional descriptions of each module in the node. The 1.2 GHz GS7000 Node is comprised of two parts, the lid and the base. The lid houses an optical interface board (OIB), and some of the...

  • Page 36

    Chapter 2 Theory of Operation In This Chapter  System Diagrams .................. 17  Forward Path ..................21  Reverse Path ..................22  Power Distribution ................23  RF Amplifier Module ................24  Forward Configuration Module ............29 ...

  • Page 37: System Diagrams

    System Diagrams System Diagrams Functional Diagrams: 4-Way Forward Segmentable Node The following diagrams show the signal flow through the 4-way forward segmentable node. Non-Segmented External External -20 dB TP -20 dB TP -20 dB Fwd. TP RF Switch RF Switch Byp ass Byp ass -20 dB...

  • Page 38

    Chapter 2 Theory of Operation Left-Right Segmented...

  • Page 39

    System Diagrams Fully Segmented External External -20 dB TP -20 dB TP -20 dB Fwd. TP RF Switch RF Switch Byp ass Byp ass -20 dB Rev. TP -20 dB Power Director Power Director Rev. TP Thermal Thermal External Ext ernal -20 dB TP -20 dB TP -20 dB...

  • Page 40

    Chapter 2 Theory of Operation Functional Diagram: Hub Node The following diagram shows the signal flow through a 4-way non-segmented hub node.

  • Page 41: Forward Path

    1310 nm or 1550 nm optical signals from the headend are applied to receiver module 1 (and/or modules 2, 3, and 4, if used) in the 1.2 GHz GS7000 Node. The receiver module detects the signal on the optical carrier applied to it and outputs an electrical RF signal to the node Optical Interface Board (OIB).

  • Page 42: Reverse Path

    The reverse path is not used in all networks. Reverse Path Signal Routing 1.2 GHz GS7000 Node reverse path signal routing functions are described below. Stage Description Reverse path RF signals are applied to node output ports 1, 2, 4, and 5. A fifth reverse path RF signal can be applied to node auxiliary output port 3 or 6 if the node is configured for local reverse path injection.

  • Page 43: Power Distribution

    The power supply module(s) convert(s) the AC input to +24.5, +8.5, -6.0, and +5.5 V DC. The +24.5, +8.5, -6.0, and +5.5 V DC lines are routed to 1.2 GHz GS7000 Node internal modules. If two power supplies are installed and both are active, the load is shared equally between them.

  • Page 44: Rf Amplifier Module

    This section describes the RF amplifier module. The RF amplifier module contains the forward band and the reverse band amplifiers. Functional Diagrams The following diagrams show how the RF amplifier functions. 1.2GHz GS7000 Node 4 Way Forward Segmentable Launch Amplifier Module AC 1 AC 2...

  • Page 45

    Forward Band Amplification 4-Way Path Description The RF amplifier module provides all forward signal amplification outside the optical receiver modules in the GS7000 Node. The 4-way segmentable launch amplifier contains four independent forward amplification paths, each having one input near the center of the amplifier module and one, two or three outputs at one end of the amplifier module.

  • Page 46

    Forward Configuration Module The forward configuration module determines the forward path topology in the RF amplifier module and the 1.2 GHz GS7000 Node. The output signals from one to four optical receivers enter the forward configuration module where they are combined and or directed to the two or four independent forward paths in the RF amplifier module.

  • Page 47

    Reverse Band Amplification Path Description The RF amplifier module provides all reverse signal amplification outside the optical transmitter modules in the 1.2 GHz GS7000 Node. It contains four independent reverse paths comprised of an AC bypass circuit, a bi-directional 20 dB down reverse...

  • Page 48

    Chapter 2 Theory of Operation amplifiers auxiliary ports and directs them to the reverse configuration module. The reverse auxiliary termination module terminates both auxiliary port reverse injection signal paths in 75 ohms as well as the path to the reverse configuration module.

  • Page 49: Forward Configuration Module

    Introduction The forward configuration module determines the forward path topology in the RF amplifier module and the 1.2 GHz GS7000 Node. The output signals from one to four optical receivers enter the forward configuration module where they are combined or directed to the four independent forward paths in the RF amplifier module.

  • Page 50

    1x4 Redundant Forward Configuration Modules Description 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.

  • Page 51

    Forward Configuration Module 2x4 Forward Configuration Modules Description The 2x4 Forward Configuration Module is used when the 1.2 GHz GS7000 Node is configured with two optical receivers, each feeding two outputs of the amplifier module. In this configuration, the node serving area is divided in half in the forward direction.

  • Page 52

    Chapter 2 Theory of Operation 3x4-1, 3, 4 Forward Configuration Module Description The 3x4-1, 3, 4 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. 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.

  • Page 53

    Forward Configuration Module 4x4 Forward Configuration Module Description 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.

  • Page 54: Reverse Configuration Module

    Introduction The reverse configuration module determines the reverse path topology in the RF amplifier module and 1.2 GHz GS7000 Node. The input signals from four independent amplifier module output ports enter the reverse configuration module where they are combined and/or directed to one to four optical transmitters. The various types of the reverse configuration module are described below.

  • Page 55

    Reverse Configuration Module 4x2 Reverse Configuration Module with Auxiliary Reverse RF Injection Description 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.

  • Page 56

    Chapter 2 Theory of Operation 4x3-1, 2, 4 Reverse Configuration Module with Auxiliary Reverse RF Injection Description The 4x3-1,2,4 Reverse Configuration Module with auxiliary reverse RF injection 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.

  • Page 57

    Reverse Configuration Module 4x4 Reverse Configuration Module with Auxiliary Reverse RF Injection Description The 4x4 Reverse Configuration Module with auxiliary reverse RF injection routes reverse inputs from Port 1 to Transmitter 1, from Port 2/3 to Transmitter 2, from Port 4 to Transmitter 3, and from Port 5/6 to Transmitter 4. 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.

  • Page 58: Optical Interface Board (oib)

    Optical Interface Board Description The Optical Interface Board (OIB) provides all interconnections between the modules in the housing lid of the 1.2 GHz GS7000 Node. The modules in the housing lid include the optical receiver, optical transmitter, power supply, and status monitoring/local control modules.

  • Page 59: Optical Receiver Module

    Optical Receiver Module Optical Receiver Module Optical Receiver Module Description The optical receiver module takes in optical signals and puts out forward band RF signals. The module cover has a sliding tray incorporated into it allowing the receivers fiber pigtail to be spooled up and contained within the receiver module. This greatly improves fiber management within the node.

  • Page 60

    Chapter 2 Theory of Operation There are two types of the receiver module: Standard Input Optical Receiver and Low Input Optical Receiver. The optical input range for the low input receiver is 0.1 w to 0.63 w (-10 dBm to -2 dBm).

  • Page 61

    22.5 -6dBm Optical 22.0 Input Power 21.5 21.0 2.25% 2.50% 2.75% 3.00% 3.25% 3.50% 3.75% 4.00% Transmitter OMI per Channel 1310nm 1550nm For the detailed information about the low input optical receiver, please refer to the latest GS7000 Data Sheet.

  • Page 62

    Chapter 2 Theory of Operation Optical Receiver Module Diagram The following diagram shows how the optical receiver module functions.

  • Page 63: Optical Analog Transmitter Modules

    Optical Analog Transmitter Module Descriptions The optical analog transmitter module takes in reverse band RF signals and puts out optical signals. The 1.2 GHz GS7000 Node is designed to work specifically with the existing mid gain, temperature compensated DFB optical transmitters. Other mid and high gain optical transmitters may be installed in the 1.2 GHz GS7000 Node...

  • Page 64

    Chapter 2 Theory of Operation Optical Analog Transmitter Module Diagram This illustration shows how the optical analog transmitter module functions.

  • Page 65: Optical Amplifier (edfa) Modules

    Optical Amplifier (EDFA) Modules Optical Amplifier (EDFA) Modules Optical Amplifier Module Descriptions Erbium-doped fiber amplifier modules are available in two categories: broadcast and narrowcast (gain-flattened). Broadcast EDFAs are used for the amplification of broadcast signals which are carried by a single optical channel anywhere between 1530 nm and 1565 nm.

  • Page 66

    Chapter 2 Theory of Operation Part Number Description GS7K-GFEDFA-21H= 21 dBm gain flattened high gain EDFA EDFA modules are single-wide, single-output devices. Each module is connected to one input fiber and one output fiber through optical fiber connectors on the side of the module housing.

  • Page 67

    This section is a reference for the operating parameters of the EDFA. The EDFA is configured through the Status Monitor/Local Control Module in the housing lid. Refer to the GS7000 Hub/Node Status Monitor/Local Control Module Installation and Operation Guide, part number OL-29937, for complete instructions on configuring the EDFA.

  • Page 68

    Chapter 2 Theory of Operation Param Products Function Default Typical Step Unit Name Value Mode Sets operating Constant mode of Gain (0) amplifier Constant Power (1) Enable Enables or Off(0) Off(0) disables amplifier On(1) BCST 17 Sets optical Power output level [B] BCST 20 Sets optical output level [B]...

  • Page 69

    Optical Amplifier (EDFA) Modules Operating Status Parameters The following table defines the monitored operating parameters for the EDFA. Parameter Name Function Typical Value Units Optical Input Power Optical input power Output Power Optical output power 19.5 Laser Temperature Laser temperature 25.0 degC Laser Bias Current...

  • Page 70

    Chapter 2 Theory of Operation Alarm Name Major Minor Minor Major Values Typical Hysteresis Units High High Value Laser Enabled Alarm Status [1] [1] This alarm sets the unit to the safe state. In the safe state, the amplifier is turned off causing the optical amplifier output to be disabled.

  • Page 71

    Optical Amplifier (EDFA) Modules 17.0/20.0/22.0 45.0 25.0 -10.0 Alarm Broadcast EDFA - Constant Gain Mode Product Type Major Minor Minor Major Values Typical Hysteresis Units High High Value 17.0/20.0/22.0 45.0 25.0 -13.0 -15.0 -12.0 Alarm Laser Temperature Set Point Adjustment In an effort to reduce EDFA power consumption, laser temperature set point is changed based on EDFA module temperature.

  • Page 72: Optical Switch Module

    Chapter 2 Theory of Operation Optical Switch Module Optical Switch Module Description 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 operates in the 1550 nm wavelength range since its application is high power/long haul systems that employ EDFAs.

  • Page 73

    This section is a reference for the operating parameters of the optical switch. The optical switch is configured through the Status Monitor/Local Control Module in the node. Refer to the GS7000 Hub/Node Status Monitor/Local Control Module Installation and Operation Guide, part number OL-29937, for complete instructions on...

  • Page 74

    Chapter 2 Theory of Operation Switch Operation The following table describes the optical switch function. Primary Input Secondary Input Alarms Optical Switch Path A Optical Power > Path B Optical Power > None Switch to Path A ThresholdA (default) Threshold B [1] Path A Optical Power <...

  • Page 75

    Optical Switch Module Parameter Function Default Values Step Unit Value Threshold A Switching threshold, -10.0 14.0 input optical power at input A Hysteresis Hysteresis Amplitude Amplitude: The value (in dB relative to the switching threshold) above which the input optical power must raise for the switch to begin the hysteresis timer before restoring...

  • Page 76

    Chapter 2 Theory of Operation Operating Status Parameters The following table defines the monitored operating parameters for the optical switch. Parameter Name Function Typical Operating Range Units Switch Position Read optical switch position PathA/PathB state (Calibrated at 1550 nm only) Path A Optical Power Input optical power on Path A -10 to 14...

  • Page 77

    Optical Switch Module [1] Hysteresis Amplitude (default 1.0 dB) is the value above which the input optical power must rise for the switch to begin sequence to return to the primary switch position. Hysteresis Amplitude is a user configurable parameter. [2] In some cases this may display as Fault (0).

  • Page 78: Local Control Module

    Local Control Module Overview A local control module and a status monitor are available for the 1.2 GHz GS7000 Node and Hub Node. A status monitor consists of a local control module with a transponder core module installed in the housing. The same housing is used for both units.

  • Page 79

    Local Control Module Note: The transponder core module can be seen through the Heart Beat/Receive/Error indicator cutout in the cover. Local Control Module Description The local control module locally monitors the following node voltages and signals:  Receiver optical input level (all receivers) ...

  • Page 80

    6 dB (wink) attenuators, the reverse band on/off switches, the optical switch, and optical amplifiers through the PC-based GS7000 ViewPort software. All parameters monitored by the local control module can be displayed and reviewed using ViewPort.

  • Page 81: Power Supply Module

    Power Supply Module Power Supply Module Power Supply Module Description The power supply module converts a quasi-square wave, 50 – 60 Hz AC input voltage into four well-regulated DC output voltages. The supply is an off-line, switched-mode power supply with a large operative input range. This reduces service outages by converting long duration AC surges into load power.

  • Page 82

    The power supply module plugs directly into the optical interface board, no external cables are required. A 1.2 GHz GS7000 Node can be configured with one or two power supplies. AC input voltage can be routed to both power supplies commonly from any node output port.

  • Page 83

    Power Supply Module Node Power Limitations Nodes and hub nodes must be configured in a manner that prevents potential thermal overloads. Heat generated by the node can reduce the life of the equipment. CAUTION: The life of the equipment may be reduced if configured to draw more than the recommended level of power from the power supplies.

  • Page 84

    Chapter 2 Theory of Operation 1:1 EDR Transmitter < 3 2:1 EDR Transmitter < 7...

  • Page 85: Installation

    Chapter 3 Installation Introduction This chapter describes the installation of the 1.2GHz GS7000 Node. In This Chapter  Tools and Test Equipment ..............66  Node Housing Ports ................68  Strand Mounting the Node ..............69  Pedestal or Wall Mounting the Node ..........72 ...

  • Page 86: Tools And Test Equipment

    Chapter 3 Installation Tools and Test Equipment Required Tools and Test Equipment The following tools and equipment are required for installation.  Torque wrench capable of 5 to 12 ft-lbs (6.8 to 16.3 Nm)  4-inch to 6-inch extension for torque wrench ...

  • Page 87

    Tools and Test Equipment Fastener Torque Specification Illustration RF Amplifier assembly shoulder 18 to 20 in-lbs screws (cross head screw) (2.0 to 2.3 Nm) Seizure nut 2 to 5 ft-lbs (2.7 to 6.8 Nm) RF cable connector Per manufacturer instructions Fiber optic cable connector 20 to 25 ft-lbs (27.1 to 33.9 Nm)

  • Page 88: Node Housing Ports

    Node Housing Ports The following illustration shows the location of available RF ports, fiber ports, and test points on the 1.2 GHz GS7000 Node housing. Notes: External test points are only active on models with the "Amplifier Type 3 - ...

  • Page 89: Strand Mounting The Node

    Strand Mounting the Node Strand Mounting the Node Description The following procedure explains how to install the 1.2 GHz GS7000 Node on a strand (aerial installation). Strand mounting allows street-side access to the housing. Procedure Follow this procedure to mount the housing to a strand. The housing does not need to be opened for strand installation.

  • Page 90

    Chapter 3 Installation Loosen the strand clamp bolts to separate the clamps enough to insert the strand, but do not remove them. Then lift the housing into proper position on the strand. Slip the clamps over the strand and finger-tighten the clamp bolts. This allows additional side-to-side movement of the housing as needed.

  • Page 91

    Strand Mounting the Node Note: If supplying power to the node through a main output port, a power inserter must be installed to inject the AC voltage onto the RF signal. Use a torque wrench and a 1/2-inch socket to tighten the strand clamp bolts from 5 ft-lb to 8 ft-lbs (6.8 to 10.8 Nm).

  • Page 92: Pedestal Or Wall Mounting The Node

    WARNING: Be aware of the size and weight of the node while mounting. A fully loaded 1.2 GHz GS7000 Node weighs over 50 lbs (22.7 kg). Ensure that proper handling/lifting techniques are employed when working in confined spaces with heavy equipment.

  • Page 93

    Pedestal or Wall Mounting the Node and set the bolts and strand clamps aside. Position the 1.2 GHz GS7000 Node horizontally in the enclosure and allow for free flow of air around it. Inadequate airflow could cause the node to exceed thermal parameters.

  • Page 94: Fiber Optic Cable Installation

    Chapter 3 Installation Fiber Optic Cable Installation Overview The 1.2 GHz GS7000 Node can accept a fiber optic cable connector from either the right or left side of the housing, or both. The fiber optic cable(s) carries forward and reverse optical signals.

  • Page 95

    Fiber Optic Cable Installation Fiber Management System The fiber management system is made up of a fiber tray and a fiber routing track. The fiber tray provides a convenient location to store excess fiber and up to two WDM modules in the node. The tray is hinged to allow it to move out of the way during the insertion of the fibers and for installation or replacement of the node power supplies.

  • Page 96

    Chapter 3 Installation...

  • Page 97

    Fiber Optic Cable Installation Note: Power supplies are removed in the previous illustration for clarity. Procedure Install fiber optic cable as described below. WARNING: Laser light hazard. The laser light source on this product emits invisible laser radiation. Avoid direct exposure. Never look into the end of an optical fiber or connector.

  • Page 98

    Chapter 3 Installation Push in the two release tabs at the top of the fiber tray and swivel the top of the fiber tray up and back to allow a clear view of the fiber routing channel below. One at a time, carefully insert fibers with attached connectors through the fiber connection port, the fiber channel, and then up and through the fiber entry point in the bottom of the fiber tray.

  • Page 99

    Fiber Optic Cable Installation Note: If using the alternate (right-side) fiber connection port, you have to route the fibers through the fiber channel in the fiber track located underneath the...

  • Page 100

    Chapter 3 Installation unused fiber holders. Hold the connector body to prevent rotation of the connector or fibers. Carefully thread the 5/8-inch threaded nut into the threaded hole of the fiber port. Tighten to 20 to 25 ft-lbs (27.1 to 33.9 Nm). Firmly tighten the rotational nut against the 5/8-inch threaded nut.

  • Page 101

    Fiber Optic Cable Installation 12 Route each fiber to its intended module through the fiber track as shown. 13 Before connection, carefully clean the optical connectors on both fiber and module according to the procedures in Care and Cleaning of Optical Connectors (on page 134).

  • Page 102: Rf Cable Installation

    RF Cable Installation Overview The 1.2 GHz GS7000 Node can accept up to six RF cables. These cables carry forward path RF signal outputs and reverse path RF signal inputs. The RF cables also supply the 45 to 90 V AC power input.

  • Page 103

    RF Cable Installation If the center conductor extends past the CUT stanchion on the housing, trim the pin flush with the end of the CUT stanchion. Remove any burrs or sharp edges from the trimmed end of the pin. Trimming Using the Strip Line Mark To trim long pins using the strip line mark on the housing, follow these steps.

  • Page 104

    Chapter 3 Installation If the center conductor extends past the STRIP line on the housing, trim the pin flush with the STRIP line. Remove any burrs or sharp edges from the trimmed end of the pin. Connecting the RF Cables to the Node Housing Follow these steps to connect the RF cables.

  • Page 105: Applying Power To The Node

    Applying Power to the Node Overview The 1.2 GHz GS7000 Node requires input power of 45 to 90 V AC from an external power source. This power is supplied through one or more of the RF cables. The powering configuration is flexible and can be changed to meet most network requirements.

  • Page 106

    Ports 4, 5 and 6 are powered from another source shunt is removed. Continue to Voltage Check Procedure. Voltage Check Procedure Always check both AC and DC voltages during initial setup of the 1.2 GHz GS7000 Node. Follow these steps to check AC and DC voltages.

  • Page 107

    Applying Power to the Node Use a true-rms DVM to check for 45 to 90 V AC input voltage at the AC test point on the power supply module. Check for the various DC output voltages (+24.5, +8.5, -6.0, and +5.5) of the power supply at the DC test points on the power supply module.

  • Page 109: Setup And Operation

    Chapter 4 Setup and Operation Introduction This chapter describes how to set up and operate the 1.2 GHz GS7000 Node. These procedures assume the 1.2 GHz GS7000 Node is installed according to the procedures in Chapter 3 of this manual.

  • Page 110: Tools And Test Equipment

    Chapter 4 Setup and Operation Tools and Test Equipment Required Tools and Test Equipment Tools and test equipment required for setup are listed below. Equivalent items may be substituted. Ensure test equipment is calibrated and in good working order.  Fluke Model 77 (or equivalent) true-rms digital voltmeter (DVM) with 0.001 resolution.

  • Page 111: System Diagrams

    System Diagrams System Diagrams Functional Diagrams: 4-Way Forward Segmentable Node The following diagrams show the signal flow through the 4-way forward segmentable node. Non-Segmented External External -20 dB TP -20 dB TP -20 dB Fwd. TP RF Switch RF Switch Byp ass Byp ass -20 dB...

  • Page 112

    Chapter 4 Setup and Operation Left-Right Segmented...

  • Page 113

    System Diagrams Fully Segmented External External -20 dB TP -20 dB TP -20 dB Fwd. TP RF Switch RF Switch Byp ass Byp ass -20 dB Rev. TP -20 dB Power Director Power Director Rev. TP Thermal Thermal External Ext ernal -20 dB TP -20 dB TP -20 dB...

  • Page 114

    Chapter 4 Setup and Operation Functional Diagram: Hub Node The following diagram shows the signal flow through a 4-way non-segmented hub node.

  • Page 115

    Become familiar with the function and component layout of the RF assembly before aligning the 1.2 GHz GS7000 Node. The cover of the RF assembly is printed with a diagram that shows the functional signal flow and identifies each field-replaceable component.

  • Page 116

    Chapter 4 Setup and Operation Right side Ports 4, 5, and 6 illustration.

  • Page 117: Forward Path Setup Procedure

    Forward Path Setup Procedure Forward Path Setup Procedure Introduction This procedure describes how to perform the forward path setup. Note: The procedure uses an example with a transmitter modulation index of 2.5% per channel and the 1.2GHz node with RF output level of 54 dBmV @ 1218 MHz. Setup Procedure Perform the following steps to set up the forward path.

  • Page 118

    Chapter 4 Setup and Operation Set the receiver module attenuator switch as follows: IF received optical power is... THEN set the attenuator switch to... Standard Receiver —2 to +2 dBm -8 dB -6 to -2 dBm 0 dB Low Input Receiver -6 to -2 dBm -8 dB -10 to -6 dBm...

  • Page 119

    See Appendix A - Technical Information for pad selection charts. 14 The GS7000 Node is set for 18 dB of linear tilt between 54 and 1218 MHz / 14.7 dB between 54 MHz and 1002 MHz.

  • Page 120

    Chapter 4 Setup and Operation If your network requires a different value, remove the field replaceable 18 dB equalizers and replace with equalizers of the appropriate value. See Forward Equalizer Chart (on page 156). 15 Continue to Reverse Path Setup Procedure or close the housing according to Opening and Closing the Housing (on page 122).

  • Page 121: Reverse Path Setup Procedure

    Introduction This procedure describes how to perform the reverse path setup. Perform this procedure only if your 1.2 GHz GS7000 Node has an active reverse path. Optical Transmitter Setup Procedure Perform the following steps to set up the proper level into the reverse path optical transmitters.

  • Page 122

    Chapter 4 Setup and Operation Using a DVM, measure the DC voltage at the optical test point and record the value. Check the connection of the optical connector. Make sure the optical connector is seated and verify that the fiber bend radius is greater than 1 inch. WARNING: When handling optical fibers always follow laser safety precautions.

  • Page 123: Reconfiguring Forward Signal Routing

    Reconfiguring Forward Signal Routing Introduction This section describes how to configure the forward signal routing of the 1.2 GHz GS7000 Node. Forward Routing Configurations The receiver modules and the forward configuration module determine the forward signal routing. Each module must be in its proper slot to achieve the different node configurations.

  • Page 124

    Chapter 4 Setup and Operation If the configuration is… Then use configuration module… Install Receivers in Positions... four receivers, each feeding 4x4 Forward 1, 2, 3, 4 separate outputs 1x4 Forward Configuration Modules A single forward receiver (RCVR 1) feeds all RF output ports. Install the receiver in RCVR 1.

  • Page 125

    Reconfiguring Forward Signal Routing 1x4 Forward Configuration Modules with Forward RF Injection A single forward receiver (RCVR 1) feeds all RF output ports. The Forward Local Injection (FLI) Module routes an RF signal from an external source to the Forward Configuration Module which is then coupled with the input from RCVR 1.

  • Page 126

    Chapter 4 Setup and Operation 1x4 Redundant Forward Configuration Modules A primary receiver (RCVR 1) and a redundant receiver (RCVR 2) feed all RF output ports. The Status Monitor/Local Control Module automatically switches from primary receiver to redundant receiver when it senses a loss of optical input to the primary receiver.

  • Page 127

    Reconfiguring Forward Signal Routing 1x4 Redundant Forward Configuration Modules with Forward RF Injection A primary receiver (RCVR 1) and a redundant receiver (RCVR 2) feed all RF output ports. The FLI Module routes an RF signal from an external source to the Forward Configuration Module which is then coupled with the input from RCVR 1/2.

  • Page 128

    Chapter 4 Setup and Operation 2x4 Forward Configuration Modules Two receivers (RCVR 1 and RCVR 3) each feed 2/3 output ports. The first receiver (RCVR 1) feeds the right side of the amplifier (Ports 4 and 5/6). The second receiver (RCVR 3) feeds the left side of the amplifier (Ports 1 and 2/3). Install the first primary receiver in RCVR 1.

  • Page 129

    Reconfiguring Forward Signal Routing 2x4 Redundant Forward Configuration Modules Two primary receivers (RCVR 1 and RCVR 3) and two redundant receivers (RCVR 2 and RCVR 4) each pair feed 2/3 output ports. The first pair of primary (RCVR 1) and redundant (RCVR 2) receivers feeds the right side of the amplifier (Ports 4 and 5/6).

  • Page 130

    Chapter 4 Setup and Operation 3x4-1, 3, 4 Forward Configuration Module Three receivers each feeding one/two/three/four RF output ports. RCVR 1 feeds Ports 4/5/6. RCVR 3 feeds Port 1. RCVR 4 feeds Ports 2/3. Note: The 3x4-1, 3, 4 FCM can only be used with the 4-way RF amplifier module. The following diagram illustrates forward path signal flow in this module.

  • Page 131

    Reconfiguring Forward Signal Routing 3x4-1, 2, 4 Forward Configuration Module Three receivers each feeding one/two/three/four RF output ports. RCVR 1 feeds Ports 5/6. RCVR 2 feeds Port 4. RCVR 4 feeds Ports 1/2/3. Note: The 3x4-1, 2, 4 FCM can only be used with the 4-way RF amplifier module. The following diagram illustrates forward path signal flow in this module.

  • Page 132

    Chapter 4 Setup and Operation 4x4 Forward Configuration Module Four receivers each feed separate RF outputs. RCVR 1 feeds Ports 5/6. RCVR 2 feeds Port 4. RCVR 3 feeds Port 1. RCVR 4 feeds Ports 2/3. Note: The 4x4 FCM can only be used with the 4-way RF amplifier module. The following diagram illustrates forward path signal flow in this module.

  • Page 133: Reconfiguring Reverse Signal Routing

    Reconfiguring Reverse Signal Routing Introduction This section describes how to configure the reverse signal routing of the 1.2 GHz GS7000 Node. Reverse Routing Configurations The transmitter modules and the reverse configuration module determine the reverse signal routing. Each module must be in its proper slot to achieve the different node configurations.

  • Page 134

    Chapter 4 Setup and Operation 4x1 Reverse Configuration Module with Auxiliary Reverse RF Injection All four ports are combined to a single reverse transmitter. 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.

  • Page 135

    Reconfiguring Reverse Signal Routing 4x1 Redundant Reverse Configuration Module All four ports are combined and the signal is split to two reverse transmitters. This allows you to have redundant transmitters. Install the transmitters in XMTR 1 and XMTR 2. The following diagram illustrates reverse path signal flow in this configuration module.

  • Page 136

    Chapter 4 Setup and Operation 4x2 Reverse Configuration Module with Auxiliary Reverse RF Injection Signals from the left side of the amplifier (Ports 1 and 2/3) are combined and routed to a transmitter (XMTR 1). Signals from the right side of the amplifier (Ports 4 and 5/6) are combined and routed to a different reverse transmitter (XMTR 3).

  • Page 137

    Reconfiguring Reverse Signal Routing 4x2 Redundant Reverse Configuration Module Signals from the left side of the amplifier (Ports 1 and 2/3) are combined and then split evenly to feed two reverse transmitters (XMTR 1 and XMTR 2). Signals from the right side of the amplifier (Ports 4 and 5/6) are combined and then split evenly to feed two reverse transmitters (XMTR 3 and XMTR 4).

  • Page 138

    Chapter 4 Setup and Operation 4x3-1, 2, 4 Reverse Configuration Module with Auxiliary Reverse RF Injection Signals from the right side of the amplifier (Ports 4 and 5/6) are combined and routed to a reverse transmitter (XMTR 4). Signals from Port 1 are routed to XMTR 1. Signals from Ports 2/3 are routed to XMTR 2.

  • Page 139

    Reconfiguring Reverse Signal Routing 4x3-1, 3, 4 Reverse Configuration Module with Auxiliary Reverse RF Injection Signals from the left side of the amplifier (Ports 1 and 2/3) are combined and routed to a reverse transmitter (XMTR 1). Signals from Port 4 are routed to XMTR 3. Signals from Ports 5/6 are routed to XMTR 4.

  • Page 140

    Chapter 4 Setup and Operation 4x4 Reverse Configuration Module with Auxiliary Reverse RF Injection A signal from each port is assigned to a dedicated reverse transmitter. An RF signal from an external source can optionally be injected and coupled with the reverse RF inputs from Ports 3/6 and routed to Transmitter 1.

  • Page 141: Maintenance

    Chapter 5 Maintenance Introduction This section describes maintenance procedures for the 1.2 GHz GS7000 Node. In This Chapter  Opening and Closing the Housing ........... 122  Preventative Maintenance ..............124  Removing and Replacing Modules ..........127  Care and Cleaning of Optical Connectors ........134...

  • Page 142: Opening And Closing The Housing

    Chapter 5 Maintenance Opening and Closing the Housing Overview Installation or maintenance of the 1.2 GHz GS7000 Node requires opening the housing to access the internal modules. Proper housing closure is important to maintaining the node in good working condition. Proper closure ensures a good seal against the environment, protecting the internal modules.

  • Page 143

    Opening and Closing the Housing...

  • Page 144: Preventative Maintenance

    Chapter 5 Maintenance Preventative Maintenance Overview Preventive maintenance procedures are regularly scheduled actions that help prevent failures and maintain the appearance of the equipment. Schedule Perform the preventive maintenance procedures at these intervals. Procedure Interval Visual Inspection: External Surfaces Semiannually Connectors Semiannually Indicators...

  • Page 145

    Preventative Maintenance What to Inspect How to Inspect Connectors Inspect for:  broken, loose, bent, corroded, or missing pins  cracked insulator inserts  Wiring and cables Inspect for:  cuts, nicks, burns, or abrasions  exposed bare conductors  sharp bends ...

  • Page 146

    Chapter 5 Maintenance WARNING: Isopropyl alcohol is flammable. Use isopropyl alcohol only in well-ventilated areas away from energized electrical circuits and heated objects such as soldering irons or open flames. Avoid excessive inhalation of vapors or prolonged or repeated contact with skin. Wear industrial rubber gloves and industrial safety goggles to avoid contact with skin.

  • Page 147: Removing And Replacing Modules

    Removing and Replacing Modules Overview This procedure describes how to remove and replace the internal modules of the 1.2 GHz GS7000 Node. All field-replaceable modules can be removed and replaced without removing power from the 1.2 GHz GS7000 Node. Field-replaceable modules include: ...

  • Page 148

    Chapter 5 Maintenance Loosen the screws securing the module. Lift the module straight up out of the housing to unplug it. Note: Pull up on the built-in handle on a receiver module, transmitter module, status monitor/local control module, or power supply module. Position the new module in the same location and carefully slide the module into its slot until connected to the optical interface board.

  • Page 149

    Removing and Replacing Modules The reversible pin adaptor is color coded. One side is blue and the other side is red. To install the module in a transmitter slot, assemble the pin adaptor on the module with the red side facing outward. To install the module in a receiver slot, assemble the pin adaptor on the module with the blue side facing outward.

  • Page 150

    Chapter 5 Maintenance Accessing the Receiver/Transmitter Module Fiber Spool and Connector Optical receivers and transmitter modules have an integrated fiber spool inside the module housing. This allows the fiber pigtail to be spooled up and contained within the module housing. You may need to access this spool to clean or replace a fiber pigtail or connector.

  • Page 151

    Removing and Replacing Modules Reattach the fiber connector to the module cover and close the cover. Forward/Reverse Configuration Module, Equalizer, and Node Signal Director Replacement Procedure The forward and reverse configuration modules, equalizers, and node signal directors plug into the RF amplifier assembly through cut-outs in its cover. To remove these modules, pull up carefully on their integrated handles until they separate from the RF amplifier assembly.

  • Page 152

    Chapter 5 Maintenance Loosen the seven shoulder screws securing the RF amplifier assembly to the housing. Note: The screw locations are identified by number, 1 through 7. Insert a flat-blade screwdriver into the small holes in the metal handles on each side of the RF amplifier assembly and pry up carefully to disconnect the RF amplifier assembly’s rear panel connectors.

  • Page 153

    Removing and Replacing Modules To replace the RF amplifier assembly in the housing, carefully align the assembly in the housing, lower it into place and push down to reconnect the rear panel connectors. Secure the RF amplifier assembly to the housing with the seven cross-head shoulder screws.

  • Page 154: Care And Cleaning Of Optical Connectors

    Chapter 5 Maintenance Care and Cleaning of Optical Connectors CAUTION: Proper operation of this equipment requires clean optical fibers. Dirty fibers will adversely affect performance. Proper cleaning is imperative. The proper procedure for cleaning optical connectors depends on the connector type. The following describes general instructions for fiber-optic cleaning.

  • Page 155

    Care and Cleaning of Optical Connectors To Clean Optical Connectors WARNING:  Avoid personal injury! Use of controls, adjustments, or performance of procedures other than those specified herein may result in hazardous radiation exposure.  Avoid personal injury! The laser light source on this equipment emits invisible laser radiation.

  • Page 156

    Chapter 5 Maintenance Cleaning Connectors It is important that all external jumper connectors be cleaned before inserting them into the optical module. Follow these steps to clean fiber optic connectors that will be connected to the optical module: Important: Before you begin, remove optical power from the module or ensure that optical power has been removed.

  • Page 157

    Care and Cleaning of Optical Connectors Insert a dry bulkhead swab into the bulkhead and rotate the swab several times. Remove the swab and discard. Swabs may be used only once. Check the bulkhead optical surface with a fiber connector scope to confirm that it is clean.

  • Page 159: Troubleshooting

    This troubleshooting section lists common problems and their solutions. Replacing Modules If a troubleshooting procedure directs you to replace a module of the 1.2 GHz GS7000 Node, see Removing and Replacing Modules (on page 127). In This Chapter  No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off ..............

  • Page 160: No Rf Output At Receiver Rf Test Point: Optical Power Led On Receiver Module Is Off

    Chapter 6 Troubleshooting No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.

  • Page 161

    No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off Notes These notes apply to the previous troubleshooting flowchart. Note Description For standard receiver For low input receiver This unit will have no RF output. This unit will have no RF output.

  • Page 162: No Rf Output: Fiber Optic Light Level Is Good, Receiver Optical Power Led Is On

    Chapter 6 Troubleshooting No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.

  • Page 163

    No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on Notes These notes apply to the previous troubleshooting flowchart. Note Description For standard receiver For low input receiver If the green LED is Off, it is outside If the green LED is Off, it is outside optical input range.

  • Page 164: Poor C/n Performance

    Chapter 6 Troubleshooting Poor C/N Performance Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.

  • Page 165

    Attenuate the light to simulate the amount of light that should be at the amount of light that should be at the 1.2 GHz GS7000 Node and rerun the 1.2 GHz GS7000 Node and rerun the C/N performance. Add components C/N performance.

  • Page 166: Poor Distortion Performance

    Chapter 6 Troubleshooting Poor Distortion Performance Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.

  • Page 167

    Attenuate the light to simulate the amount of light that should be at the 1.2 GHz GS7000 Node and rerun the distortion performance. If the distortion performance improves, there is too much light. An inline optical attenuator or a coupler with a higher loss can reduce the light, or the laser may have to be replaced with a lower launch power.

  • Page 168: Poor Frequency Response

    Chapter 6 Troubleshooting Poor Frequency Response Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.

  • Page 169

     The frequency response of the 1.2 GHz GS7000 Node is ±1.0 dB from 52 MHz to 1218 MHz (for optical receiver and amplifier combined). It is possible that the RF amplifier is set up incorrectly. Always check to see that padding and equalization is correct to ensure proper levels at the inputs to each gain stage.

  • Page 170: No Rf Output From Reverse Receiver

    Chapter 6 Troubleshooting No RF Output from Reverse Receiver Troubleshooting Flowchart Follow this troubleshooting flowchart.

  • Page 171: Customer Support Information

    Chapter 7 Customer Support Information If You Have Questions If you have technical questions, call Cisco Services for assistance. Follow the menu options to speak with a service engineer. Access your company's extranet site to view or order additional technical publications. For accessing instructions, contact the representative who handles your account.

  • Page 173: Appendix A Technical Information

    auto letter Appendix A Technical Information In This Appendix  Linear Tilt Chart .................. 154  Forward Equalizer Chart ..............156 Introduction This appendix contains tilt, forward and reverse equalizer charts and pad values and part numbers.

  • Page 174: Linear Tilt Chart

    Appendix A Technical Information Linear Tilt Chart Amplifier Output Linear Tilt Chart for 1.2 GHz The following chart can be used to determine the operating level at a particular frequency considering the operating linear tilt.

  • Page 175

    Linear Tilt Chart Amplifier Output Linear Tilt Chart for 1 GHz The following chart can be used to determine the operating level at a particular frequency considering the operating linear tilt. Example: If the amplifier’s 1 GHz output level is 49.0 dBmV with a linear operating tilt of 14.5 dB (from 50 to 1 GHz), the corresponding output level at 750 MHz would be 45.1 dBmV.

  • Page 176: Forward Equalizer Chart

    Appendix A Technical Information Forward Equalizer Chart 1.2 GHz Forward Linear Equalizers The following table shows the 1.2 GHz forward linear equalizer loss. EQ Value Insertion Loss at (MHz) Total Tilt (dB) 1218 1000 (52-1218 MHz) 10.5 10.5 12.0 12.0 13.5 13.5 15.0...

  • Page 177

    Forward Equalizer Chart 1 GHz Forward Linear Equalizers The following table shows the 1 GHz forward linear equalizer loss. EQ Value Insertion Loss at (MHz) Total Tilt (dB) 1000 (52-1000 MHz) 10.0 10.5 11.1 11.3 11.5 10.5 12.0 12.0 12.6 12.8 13.0 13.5...

  • Page 178: Appendix B Enhanced Digital Return Multiplexing Applications

    Enhanced Digital Return Multiplexing Applications This appendix explains the installation and application of the Cisco Enhanced Digital Return (EDR) 85 Multiplexing System in the GS7000 Node. The products are intended for digital transmission of reverse path signals over a fiber optic link from the node to the headend.

  • Page 179: Enhanced Digital Return System Overview

    Space-saving, high-density deployment in Prisma II or Prisma II XD chassis increases deployment cost-efficiency Optional monitoring of node (GS7000) and Tx (GS7000 and GainMaker) parameters available at the receiver The EDR 2:1 Enhanced Digital Return Multiplexing System leverages 2:1...

  • Page 180

    System Functional Diagrams Single Transmitter Configuration Single Transmitter Configuration for EDR 1:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with one 1:1 EDR transmitter module installed as the single transmitter. Important: This configuration requires a 4x1 Reverse Configuration Module (for...

  • Page 181

    Enhanced Digital Return System Overview Single Transmitter Configuration for EDR 2:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with one 2:1 EDR transmitter module installed as the single transmitter. Note: When the node is configured in either segmented or EDR mode, a 75 dB pad must be placed in the Tx2 SM Term.

  • Page 182

    Enhanced Digital Return Multiplexing Applications Full Configuration Full Configuration for EDR 1:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with four 1:1 EDR transmitter modules installed as the maximum configuration. Note: When the node is configured in either segmented or EDR mode, a 75 dB pad must be placed in the Tx2 SM Term.

  • Page 183

    Enhanced Digital Return System Overview shown. Full Configuration for EDR 2:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with two 2:1 EDR transmitter modules installed as the maximum configuration. Note: When the node is configured in either segmented or EDR mode, a 75 dB pad must be placed in the Tx2 SM Term.

  • Page 184: System Block Diagram

    Appendix B Enhanced Digital Return Multiplexing Applications System Block Diagram System Block Diagram for EDR 1:1 Transmitter Module The following is a block diagram of the EDR Enhanced Digital Return 1:1 Multiplexing System. System Block Diagram for EDR 2:1 Transmitter Module...

  • Page 185

    Enhanced Digital Return System Overview The following is a block diagram of the EDR Enhanced Digital Return 2:1 Multiplexing System.

  • Page 186

    Appendix B Enhanced Digital Return Multiplexing Applications EDR Transmitter Module At the transmit (node) end of the system, reverse-path RF input signals from each node port are routed to an EDR 2:1 or EDR 1:1 Transmitter module in the housing lid. The transmitter module converts each signal to a baseband digital data stream and combines the signals into a serial data stream using time-division multiplexing (TDM).

  • Page 187

    2. The EDR LCM module needs to be installed for EDR transmitter status monitoring. 3. The status monitor interface is not used for data transmission. The Cisco DOCSIS transponder is needed when data transmission is required. The transmitter module uses the same style housing as the optical receivers and...

  • Page 188

    2. The EDR LCM module needs to be installed for EDR transmitter status monitoring. 3. The status monitor interface is not used for data transmission. The Cisco DOCSIS transponder is needed when data transmission is required. The transmitter module uses the same style housing as the optical receivers and transmitters, except that it uses double-wide module housing.

  • Page 189

    Enhanced Digital Return System Overview For EDR 1:1 Transmitter Module Note: This example shows four transmitter modules installed in the node, which requires a 4x4 Reverse Configuration Module.

  • Page 190

    Appendix B Enhanced Digital Return Multiplexing Applications For EDR 2:1 Transmitter Module Note: This example shows two transmitter modules installed in the node, which requires a 4x4 Reverse Configuration Module.

  • Page 191

    RF output port. A single EDR Receiver module occupies one slot in a Cisco Prisma II XD chassis. Two EDR HD receiver modules can be vertically stacked in an associated Prisma II Host Module that occupies a single-wide slot in the Prisma II standard chassis.

  • Page 192

    Appendix B Enhanced Digital Return Multiplexing Applications Receiver Module Diagram The following illustration shows the receiver module.

  • Page 193

    Enhanced Digital Return System Overview Receiver Operating Modes The receiver module supports receiver mode configuration performed by setting the proper mode ID numbers in the Prisma II Web UI system. The following diagrams provide a basic walk-through of all the supported modes for the EDR receiver module.

  • Page 194

    Appendix B Enhanced Digital Return Multiplexing Applications Dual 1:1 Mode Referring to the diagram below, the EDR transmitter digitizes a single RF signal (RF 1) into a serial stream and transmits it over optical fiber to the receiver. At the receiver, the serial streams from two separate transmitters are deserialized and converted back to an analog RF signal.

  • Page 195

    Enhanced Digital Return System Overview Single 2:1 on Primary + Single 1:1 on Secondary This mode is a combination of the 2:1 and 1:1 modes described above. Referring to the diagram below, one EDR transmitter digitizes and combines two RF signals (RF 1 + RF 2) into one serial stream and transmits it over optical fiber to the receiver.

  • Page 196

    Appendix B Enhanced Digital Return Multiplexing Applications EDR OPM and LCM About the OPM Module The reverse transmitter converts the RF test signal(s) to an optical signal using the installed Optical Module (OPM) and transmits it to the headend (or hub site) via fiber optic cable.

  • Page 197: Enhanced Digital Return (edr) System Installation

    Before You Begin Overview Perform these installation instructions only if you are upgrading the GS7000 Node with the EDR. If your node came with the EDR installed, go to Reverse Balancing the Node with Digital Return Modules (on page 234).

  • Page 198

    Appendix B Enhanced Digital Return Multiplexing Applications Installing the EDR Transmitter The transmitter module uses the same style housing as the optical receivers and transmitters, except that it uses double-wide module housing. As such, it occupies two standard transmitter positions in the node lid. If your EDR transmitter comes without OPM module installed, you need to order the fiber jumper and the OPM module from our sales representatives, and perform the following steps to install the OPM module and connect the fiber jumper to the...

  • Page 199

    Enhanced Digital Return (EDR) System Installation Proceed to next section for installation. The following diagram shows the OPM module installed on the 1:1 transmitter module. The following diagram shows the OPM module installed on the 2:1 transmitter module. CAUTION: Removing and installing an OPM module can shorten its useful life. Do not remove and insert OPM modules more often than is absolutely necessary.

  • Page 200

    Appendix B Enhanced Digital Return Multiplexing Applications To Route the Fiber Jumper Make sure the transmitter module is installed with the OPM module before routing the fiber jumper. The fiber jumper must be routed carefully in the fiber tray and aligned under the fiber jumper clip one by one.

  • Page 201

    Enhanced Digital Return (EDR) System Installation To Install the EDR Transmitter Follow these steps to install the transmitter module(s). See Module Replacement Procedure (on page 127) for instructions on installing these modules in the housing. Remove any existing transmitter modules from the positions in which you want to install the EDR transmitter module(s).

  • Page 202

    Appendix B Enhanced Digital Return Multiplexing Applications two transmitter modules install the modules in transmitter positions XMTR 1/XMTR 2 and XMTR 3/XMTR 4 install an appropriate Reverse Configuration Module in the RF amplifier assembly. Refer to the RCM Section on page 40 for details. The following illustrations show the location of the installed modules in the node.

  • Page 203

    To Connect the Long-haul Fiber Insert the fiber-optic start-head to the optical adapter. Route fiber on the fiber tray of GS7000 GainMaker Node. Connect the fiber-optic end-head to the receive bore of the OPM module installed on the Receiver of the Prisma II platform.

  • Page 204

    Press the Auto Set-Up button on the LCM to initiate module discovery. The Auto-Setup process typically takes up to 30 seconds. Note: Node data monitoring is only available for GS7000 Nodes with a transponder-less EDR LCM installed. The PC-based GS7000 ViewPort software is...

  • Page 205

    Enhanced Digital Return (EDR) System Installation Installing the EDR Receiver Refer to the Cisco Prisma II EDR Receiver Installation Guide, part number 4044294, for detailed information on installing the EDR receiver module on the Prisma II. To Install the OPM Module on the Receiver Module The following diagram shows the OPM module installed on the receiver module of the Prisma II.

  • Page 206: Transmitter Module Setup Procedure

    Appendix B Enhanced Digital Return Multiplexing Applications Transmitter Module Setup Procedure Perform the following steps to set up the reverse transmitter module(s). Open the housing according to Opening and Closing the Housing (on page 122). In the base of the housing verify that the Reverse Configuration Module installed in the RF amplifier is correct for your application.

  • Page 207

    The following table lists the LED status and the indicated OPM, and the overdrive status of the RF port. Indication Power (PWR) Laser (LSR) OPM Module Port Input Overdrive Green Green Cisco Standard OPM Module Orange Non-Cisco Standard OPM Green (Solid) Module Cisco Standard OPM Module/ Orange...

  • Page 208

    Appendix B Enhanced Digital Return Multiplexing Applications Orange Orange Non-Cisco Standard OPM (Blink) (Solid) Module Orange Orange Cisco Standard OPM Module (Blink) (Blink)

  • Page 209: Reverse Balancing The Node With Edr

    Reverse Balancing the Node with EDR Reverse Balancing the Node with EDR Introduction This section explains the reverse balancing procedures for the GS7000 Node using EDR. When balancing the reverse path, reference your system design print for the required reverse signal level. Use appropriate padding and equalization to provide proper signal level to the reverse transmitter.

  • Page 210

    Appendix B Enhanced Digital Return Multiplexing Applications The amplitude of the received test signals at the output of the reverse optical receiver in the headend or hub may be measured and monitored using the following: Spectrum analyzer (when using a CW generator for test signals) ...

  • Page 211

    Note: The ADC full-scale (100%) level for a single CW carrier is +33 dBmV. This is the level at which the ADC begins clipping. Note: The reverse attenuator (pad) and reverse equalizer in the GS7000 Node is selected during the reverse system design, and it is based on the drive level into the digital module which is determined by system performance requirements, type and quantity of return carriers, etc.

  • Page 212: Troubleshooting

    Enhanced Digital Return Multiplexing Applications Troubleshooting Equipment The following equipment may be necessary to perform some troubleshooting procedures. Cisco fiber optic ferrule cleaner, part number 468517, to clean fiber optic  connectors Cisco 99% alcohol and lint free wipes to clean fiber connectors ...

  • Page 213

    Verify that connectors of the transmitter are clicked into the interface connectors in the transponder slot. If still no power supply, contact the Cisco Technical Service Center for assistance. Green Orange Non-Cisco Standard OPM No need for troubleshooting. (Solid) Module is installed.

  • Page 214

    Verify that connectors of the transmitter are clicked into the interface connectors in the transponder slot. If still no power supply, contact the Cisco Technical Service Center for assistance. Green Orange Non-Cisco Standard OPM No need for troubleshooting. (Solid) Module is installed.

  • Page 215

    Verify the input level of RF port 1. The output level overdrive indicates the output signal level exceeds the limit of 35 dBmV. Cisco Standard OPM Module is highly recommended for better system performance and stability. See the data sheet of the node for...

  • Page 216

    Allow up to one minute after too high or low. power is ON for the temperature to stabilize. If still no output, contact the Cisco Technical Service Center for assistance. Laser could be faulty. Contact the Cisco Technical Service Center for assistance.

  • Page 217: Appendix C Expanded Fiber Tray

     Expanded Fiber Tray Overview ............198  Expanded Fiber Tray Installation ............. 200  Fiber Management System ..............203  Configuration Examples ..............209 Introduction This appendix explains the installation and configuration of the GS7000 Node expanded fiber tray.

  • Page 218: Expanded Fiber Tray Overview

    Introduction The expanded fiber tray is an optional replacement for the standard fiber tray in the GS7000 Node. The expanded fiber tray provides additional space for fiber management/storage and the installation of additional bulkhead adaptors. The expanded fiber tray also provides the space for the installation of various passive devices such as CWDM and OADM cassettes and raw WDM cartridges.

  • Page 219

    Expanded Fiber Tray Overview Tray Components The following illustration shows the unassembled expanded fiber tray components.

  • Page 220: Expanded Fiber Tray Installation

    Appendix C Expanded Fiber Tray Expanded Fiber Tray Installation Installation Procedure Perform the following steps to install the expanded fiber tray in the node. If you are replacing a standard fiber tray in an existing node, go to step 2. If you are not replacing a standard fiber tray, go to step 3.

  • Page 221

    Expanded Fiber Tray Installation Important:  Make sure that the fiber tray fits into the two guide slots in the fiber track near the power supplies.  Make sure that the fingers and locking tabs on the other end of the fiber tray are inserted between the fiber track and the aluminum node housing.

  • Page 222

    Appendix C Expanded Fiber Tray Pivot the fiber tray down and snap it into place on top of the power supplies with its locking tabs and in the node lid with its hold-down tab as shown in the following illustration.

  • Page 223: Fiber Management System

    Fiber Management System Fiber Management System Overview The fiber management system is made up of a fiber tray and a fiber routing track. The fiber tray provides a convenient location to mount passive devices and store excess fiber. The tray is hinged to allow it to move out of the way during the insertion of the fibers and for installation or replacement of the various node modules.

  • Page 224

    Appendix C Expanded Fiber Tray Proper Fiber Routing Observe the following considerations regarding fiber routing: Poor fiber routing is a major cause of bend radius violations.  Proper fiber routing provides well-defined paths, making it easier to access  individual fibers. Easy to follow paths aid technicians in performing fiber tracing, testing, and ...

  • Page 225

    Fiber Management System Connector and Bulkhead Access Observe the following considerations regarding connector and bulkhead access: Connector access is critical for reconfiguration, testing, maintenance, and  troubleshooting. The expanded fiber tray provides a clip which can accommodate up to four ...

  • Page 226

    Appendix C Expanded Fiber Tray the three circular retaining tracks in the expanded fiber tray. The following illustrations show the available mounting clips. 2-Adaptor Clip The following illustration shows a 2-adaptor clip for bulkhead adaptors. 4-Adaptor Clip The following illustration shows a 4-adaptor clip for bulkhead adaptors. 3-Cartridge Clip The following illustration shows a 3-cartridge clip holding raw WDM cartridges.

  • Page 227

    Fiber Management System CWDM Clip The following illustration shows a CWDM clip. Cassette Device Clip The following illustration shows a cassette device clip holding a demultiplexer.

  • Page 228

    Appendix C Expanded Fiber Tray Fiber Installation For general instructions on installing and routing the fiber optic cables in the node, refer to the Fiber Optic Cable Installation (on page 74).

  • Page 229: Configuration Examples

    The following illustration shows a cartridge style WDM configuration of the expanded fiber tray. This application is used to fully segment the GS7000 4-Port Node when limited fiber counts are available, or as means to conserve fibers for future use.

  • Page 230

    Appendix C Expanded Fiber Tray illustration. Headend GS7000 Node WDMs WDMs Fwd TX Fwd RX Service Group 1 Service Group 1 Rtrn RX Rtrn TX Service Group 1 Service Group 1 Fwd TX Fwd RX Service Group 2 Service Group 2...

  • Page 231

    Configuration Examples The following illustration shows a cassette style O-Band demultiplexer configuration of the expanded fiber tray. Using the O-Band demultiplexer in the expanded fiber tray, the four multiplexed 13xx multi-wave forward path signals are demultiplexed and feed into the four individual receiver modules to achieve 4x forward segmentation with a single fiber.

  • Page 232

    Appendix C Expanded Fiber Tray...

  • Page 233

    Glossary ampere. A unit of measure for electrical current. ac, AC alternating current. An electric current that reverses its direction at regularly recurring intervals. AC/RF alternating current radio frequency. automatic frequency control. An arrangement whereby the tuning of a circuit is automatically maintained within specified limits with respect to a reference frequency.

  • Page 234

    Glossary auxiliary. baseband The original band of frequencies occupied by the signal before it modulates the carrier frequency to form the transmitted signal. Characteristic of any network technology that uses a single carrier frequency and requires all stations attached to the network to participate in every transmission.

  • Page 235

    Glossary C/N or CNR carrier-to-noise ratio. The ratio, in decibels, of the carrier to that of the noise in a receiver's IF bandwidth after specified band limiting and before any nonlinear process such as amplitude limiting and detection takes place. carrier-to-noise temperature ratio.

  • Page 236

    Glossary decibels relative to 1 milliwatt. dBmV decibels relative to 1 millivolt. dBuV decibels relative to 1 microvolt. decibels relative to 1 watt. directional coupler. dc, DC direct current. An electric current flowing in one direction only and substantially constant in value.

  • Page 237

    Glossary cables, etc.) used to carry signals from the headend system to subscriber terminals. digital signal processor. duplexer A device which permits the connection of both a receiver and a transmitter to a common antenna. digital voltmeter. DWDM dense wave-division multiplexing. A method of placing multiple wavelengths of light into a single fiber that yields higher bandwidth capacity.

  • Page 238

    Glossary equalization The process of compensating for an undesired result. For example, equalizing tilt in a distribution system. effective radiated power. electrostatic discharge. Discharge of stored static electricity that can damage electronic equipment and impair electrical circuitry, resulting in complete or intermittent failures. forward configuration module.

  • Page 239

    Glossary gain A measure of the increase in signal level, relative to a reference, in an amplifier. Usually expressed in decibels. Hertz A unit of frequency equal to one cycle per second. hybrid fiber/coaxial. A network that uses a combination of fiber optics and coaxial cable to transport signals from one place to another.

  • Page 240

    Glossary light-emitting diode. An electronic device that lights up when electricity passes through it. low-noise converter. Mbps megabits per second. A unit of measure representing a rate of one million bits (megabits) per second. multipath, multipath transmission The phenomenon which results from a signal traveling from point to point by more than one path so that several copies of the signal arrive at the destination at different times or at different angles.

  • Page 241

    Glossary schemes can be represented. QPSK quadrature phase-shift keying. A phase modulation technique for representing digital information. QPSK produces four discrete states, each state representing two bits of information. reverse configuration module. RCVR receiver. reverse path Signal flow direction toward the headend. radio frequency.

  • Page 242

    Glossary status monitor. status monitoring and control. The process by which the operation, configuration, and performance of individual elements in a network or system are monitored and controlled from a central location. SMIU status monitor interface unit. SNMP simple network management protocol. A protocol that governs network management and the monitoring of network devices and their functions.

  • Page 243

    Glossary watt. A measure of electrical power required to do work at the rate of one joule per second. In a purely resistive load, 1 Watt = 1 Volt x 1 Amp.

  • Page 245

    Index 3x4-1,2,4 Forward Configuration Module • 111 1 GHz Forward Linear Equalizers • 157 3x4-1,2,4 Forward Configuration Module 1x2 and 1x4 Forward Configuration Modules • Description • 32 3x4-1,3,4 Forward Configuration Module • 110 1x2 and 1x4 Forward Configuration Modules Description •...

  • Page 246

    Index attenuator • 213 4x3-1,2,4 Reverse Configuration Module with Auxiliary Reverse RF Injection • 118 AUX • 214 4x3-1,2,4 Reverse Configuration Module with Auxiliary Reverse RF Injection Description • baseband • 214 baud (Bd) • 214 4x3-1,3,4 Reverse Configuration Module with Auxiliary Reverse RF Injection •...

  • Page 247

    Index CWDM • 215 EDR Transmitter Status Indicators • 187 EEPROM • 217 dB • 215 EMC • 217 dBc • 215 emission designer • 217 dBi • 215 Enhanced Digital Return (EDR) System Installation • 177 dBm • 216 Enhanced Digital Reverse System Overview •...

  • Page 248

    Index Fiber Optic Cable Installation • 74 4-Way Forward Segmentable Node • 17, 91 Fiber Protection • 205 gain • 219 FM • 218 General Information • 1 Forward Band Amplification 2-Way and 4-Way Path Description • 25 Forward Configuration Module • 29 Hertz •...

  • Page 249

    Index 103, 113, 189, 198, 212 Optical Power LED on Receiver Module is Off • 140 ITU • 219 No RF Output from Reverse Receiver • 150 node LE • 219 opening and closing • 122 LED • 220 Node Fastener Torque Specifications • 66 Linear Tilt Chart •...

  • Page 250

    Index Optical Receiver Module Diagram • 42 PROM • 220 Optical Switch Module • 52 Proper Fiber Routing • 204 Optical Switch Module Description • 52 PWB • 220 Optical Switch Module Diagram • 53 QAM • 220 Optical Switch Operating Parameters • 53 QPSK •...

  • Page 251

    Index Reverse Path • 22 Setup and Operation • 89 Reverse Path Setup Procedure • 101 Setup Procedure • 97 Reverse Path Signal Routing • 22 Single Transmitter Configuration • 160 Reverse Routing Configurations • 113 SM • 222 RF • 221 SMC •...

  • Page 252

    Index troubleshooting flowcharts • 139 TX • 222 UPS • 222 uV • 222 V • 222 Visual Inspection • 124 Voltage Check Procedure • 86 W • 223 WDM Configuration Example • 209...

  • Page 254

    Fax: 408 527-0883 This document includes various trademarks of Cisco Systems, Inc. Please see the Notices section of this document for a list of Cisco Systems, Inc., trademarks used in this document. Product and service availability are subject to change without notice.

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