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OL-29936-01
Model GS7000 Optical Hub
Installation and Configuration Guide

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  • Page 1

    OL-29936-01 Model GS7000 Optical Hub Installation and Configuration 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

    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: www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners.

  • Page 5: Table Of Contents

    Contents Important Safety Instructions Laser Safety Laser Warning Labels xvii Chapter 1 General Information Equipment Description ......................2 Overview ........................2 Physical Description ....................2 Functional Description ....................4 Features and Benefits ....................5 Housing Inputs/Outputs Diagram ................6 Modules Functional Descriptions ................7 Model Number Matrix ....................

  • Page 6

    Contents Fiber Optic Connections - Active to Passive Modules ............33 Overview ........................33 Fiber Management System ..................33 Procedure ........................34 RF Cable Installation ......................37 Overview ........................37 Trimming the Center Conductor ................37 Connecting the RF Cables to the Housing ............39 Applying Power to the Hub ....................

  • Page 7

    Tips for Optimal Fiber Optic Connector Performance ........103 To Clean Optical Connectors ................104 Chapter 5 Customer Information Appendix A Technical Information Model GS7000 Optical Hub Accessory Part Numbers ........... 110 Attenuators ......................110 Torque Specifications ......................112 Node Fastener Torque Specifications ..............112 Appendix B Expanded Fiber Tray Expanded Fiber Tray Overview..................

  • Page 8

    Contents Expanded Fiber Tray Installation ..................116 Installation Procedure .................... 116 Fiber Management System ....................119 Overview ........................119 Maintaining Fiber Bend Radius ................119 Proper Fiber Routing ....................120 Connector and Bulkhead Access ................121 Fiber Protection ....................... 121 Passive Device and Bulkhead Mounting .............

  • Page 9: Important Safety Instructions

    Important Safety Instructions Important Safety Instructions Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Only use attachments/accessories specified by the manufacturer. Read and Retain Instructions Carefully read all safety and operating instructions before operating this equipment, and retain them for future reference.

  • Page 10

    Important Safety Instructions Know the following safety warnings and guidelines: Only qualified service personnel are allowed to perform equipment installation  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.

  • Page 11

    Important Safety Instructions Ensure the installation site and operating environment is compatible with the  equipment’s International Protection (IP) rating specified in the equipment’s data sheet. Connecting to Utility AC Power Important: If this equipment is a Class I equipment, it must be grounded. If this equipment plugs into an outlet, the outlet must be near this equipment, ...

  • Page 12

    Important Safety Instructions Safety Plugs (USA Only) This equipment may be equipped with either a 3-terminal (grounding-type) safety plug or a 2-terminal (polarized) safety plug. The wide blade or the third terminal is provided for safety. Do not defeat the safety purpose of the grounding-type or polarized safety plug.

  • Page 13: Equipotential Bonding

    Important Safety Instructions 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.

  • Page 14: Electrostatic Discharge

    Important Safety Instructions 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 ...

  • Page 15

    Important Safety Instructions 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.

  • Page 16

    Important Safety Instructions 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.

  • Page 17: 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 18

    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 19: 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 20

    Laser Warning Labels Location of Labels on Equipment The following illustrations display the location of warning labels on this equipment. xviii OL-29936-01...

  • Page 21

    Laser Warning Labels OL-29936-01...

  • Page 23: Chapter 1 General Information

    Chapter 1 General Information Introduction This manual describes the installation and operation of the Model GS7000 Optical Hub. In This Chapter  Equipment Description ................2 OL-29936-01...

  • Page 24: Equipment Description

    Optical Hub. Physical Description The Model GS7000 Optical Hub is an optical platform in a Model GS7000 Node housing. 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.

  • Page 25

    Equipment Description The following illustration shows the Model GS7000 Optical Hub internal modules and components. OL-29936-01...

  • Page 26: Functional Description

    The GS7000 platform is a flexible hub node platform that enables operators to initially deploy the Model GS7000 Node and later migrate to either a hub node or a full optical hub. The GS7000 platform is one of the industry's most user-friendly platforms to migrate, and one of the most flexible platforms to meet all of your optical node and optical hub needs.

  • Page 27: Features And Benefits

    Equipment Description The Model GS7000 Node can be upgraded to a Model 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 28: Housing Inputs/outputs Diagram

    The following diagram shows the housing port inputs and outputs for coaxial (COAX) and fiber service cables (FSC) of the Model GS7000 Optical Hub. Note: Ports RF 1, RF 2, RF 4, and RF 5 (not shown) on the housing base are not used for COAX cable connections on the optical hub.

  • Page 29: Modules Functional Descriptions

    Equipment Description Modules Functional Descriptions This table briefly describes each module. The Model GS7000 Optical Hub may not contain all these modules. Module Description Optical Amplifier Erbium-doped fiber amplifier modules are available in two categories: (EDFA) broadcast and narrowcast. EDFAs are available in 17 dBm, 20 dBm, and 22 dBm (standard) for broadcasting.

  • Page 30

    The power supply module has multiple output voltages of +24.5, +8.5, -6.0, and +5.5 VDC. A second power supply can be installed in the housing for redundancy or load sharing. The Model GS7000 Optical Hub can be set up in the following powering configurations: ...

  • Page 31: Model Number Matrix

    Equipment Description Model Number Matrix The Model GS7000 Optical Hub is capable of many configurations to fill various network requirements. Each hub is assigned a model number that describes its individual configuration. The model number is located on a label on the inside of the housing.

  • Page 32

    Chapter 1 General Information Model Number Segment Name of Unit or Options Available Segment Code H: Gain Flattened X/1/2/3 X = None EDFA, 21 dBm, Low 1 = One gain flattened SC/APC unit installed Gain 2 = Two gain flattened SC/APC units installed 3 = Three gain flattened SC/APC units installed I: Gain Flattened X/1/2/3...

  • Page 33: Chapter 2 Installation

    Chapter 2 Installation Introduction This chapter describes the installation of the Model GS7000 Optical Hub. In This Chapter  Tools and Test Equipment ..............12  Housing Ports ..................14  Strand Mounting ................... 15  Pedestal or Wall Mounting ..............18 ...

  • Page 34: Tools And Test Equipment

    Chapter 2 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 35

    Tools and Test Equipment Fastener Torque Specification Illustration 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) Note: The typical insertion force required for RF connectors and RF terminators is 20-30 lbsf.

  • Page 36: Housing Ports

    Housing Ports The following illustration shows the location of available RF ports and fiber ports on the Model GS7000 Optical Hub housing. Note: When replacing plugs at ports TP1, TP2, TP4, or TP5 torque from 5 to 8 ft-lbs (6.8 to 10.8 Nm).

  • Page 37: Strand Mounting

    Strand Mounting Strand Mounting Description The following procedure explains how to install the Model GS7000 Optical Hub 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 38

    Chapter 2 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 39

    Strand Mounting 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). Note: A slight tilt of the face of the housing is normal. Cable tension will cause the housing to hang more closely to vertical.

  • Page 40: Pedestal Or Wall Mounting

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

  • Page 41

    Pedestal or Wall Mounting Position the housing horizontally in the enclosure and allow for free flow of air around it. Inadequate airflow could cause the unit to exceed thermal parameters. Line up the bolt holes on the bottom of the housing with the mounting holes on the pedestal bracket provided by the pedestal manufacturer.

  • Page 42: Housing Lid Fiber Optic Cable Installation - Active Modules

    Installation - Passive Modules (on page 28) for instructions on housing base FSC installation. The Model GS7000 Optical Hub can accept a fiber optic cable connector for the active modules in the housing lid from either the left side (port F1) or right side (port F2) of the housing, or both.

  • Page 43: Fiber Management System

    Housing Lid Fiber Optic Cable Installation - Active Modules Fiber Number Fiber Color Connects to slot 8 Input "B" on OPSW Black slot 8 Output on OPSW Yellow Violet Pink (Rose) Aqua Fiber Management System The fiber management system for active modules is made up of a fiber tray and a fiber routing track.

  • Page 44

    Chapter 2 Installation An expanded fiber tray is available as an option. Refer to Appendix B -  Expanded Fiber Tray (on page 113) for more information. The following illustrations show the location and layout of the fiber tray and track in the housing lid.

  • Page 45: Procedure

    Housing Lid Fiber Optic Cable Installation - Active Modules 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. Failure to observe this warning can result in eye damage or blindness.

  • Page 46

    Chapter 2 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. Slip a length of heat shrink tubing over the fibers and past the connector body. Use a piece long enough to cover the cable connector and fiber port nut when assembled later.

  • Page 47

    Housing Lid Fiber Optic Cable Installation - Active Modules OL-29936-01...

  • Page 48

    Chapter 2 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 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.

  • Page 49

    Housing Lid Fiber Optic Cable Installation - Active Modules 13 Route each fiber to its intended module through the fiber track as shown. 14 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 103).

  • Page 50: Housing Base Fiber Optic Cable Installation - Passive Modules

    Passive Modules Overview The Model GS7000 Optical Hub housing comes with six fiber cable entry ports, two on the lid and four on the base. The lid ports utilize a standard 4 to 12 count FSC cable connecting the actives modules, such as EDFAs and optical switches, to the fiber closure.

  • Page 51: Fiber Management System

    Housing Base Fiber Optic Cable Installation - Passive Modules Fiber Management System The fiber management system for passive modules is made up of two fiber slack spools and a fiber routing track. The fiber slack spools provide a convenient location to store excess fiber in the node. The fiber slack spools are located at each end of the housing base just inside the fiber entry ports for the passive devices.

  • Page 52

    Chapter 2 Installation The first step depends on whether the fiber optic cable is factory installed or not. IF... THEN... fiber optic cable is splice fiber pigtail of optical fiber input cable to your splice factory installed enclosure and continue to Fiber Optic Connections - Active to Passive Modules (on page 33).

  • Page 53

    Housing Base Fiber Optic Cable Installation - Passive Modules Hold the individual fiber cables to prevent them from rotating and 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 main body nut against the 5/8-inch threaded nut, and then the back rotational nut against the main body nut.

  • Page 54

    Chapter 2 Installation 11 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 103). 12 Open the passive module fiber connector cover. Carefully slide the fiber connector into the module connector until it clicks.

  • Page 55: Fiber Optic Connections - Active To Passive Modules

    Fiber Optic Connections - Active to Passive Modules Overview The Model GS7000 Optical Hub allows for the required fiber optic interconnections between the active and passive modules within the hub housing. This procedure assumes a specific type of connector as an example. Your connector may be different from the one shown in these illustrations.

  • Page 56: Procedure

    Chapter 2 Installation Procedure Install fibers 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. Failure to observe this warning can result in eye damage or blindness.

  • Page 57

    Fiber Optic Connections - Active to Passive Modules The first step depends on whether the fibers are factory installed or not. IF... THEN... fibers are factory Continue to RF Cable Installation (on page 37). installed fibers are not go to step 2. installed Determine which active modules must be connected to which passive modules for your specific network architecture.

  • Page 58

    Chapter 2 Installation Note: It may take a few attempts to determine the correct length of fiber to reach each passive module. It's best to not insert the fibers in the routing tracks while estimating the proper length. Rather, position the fibers on top of the tracks while estimating.

  • Page 59: Rf Cable Installation

    RF Cable Installation Overview The Model GS7000 Optical Hub can accept up to two RF cables. These cables carry forward path RF signal inputs and reverse path RF signal outputs to and from the Status Monitor module. The RF cables also supply the 45 to 90 VAC power input to the hub.

  • Page 60

    Chapter 2 Installation Trimming Using the Integrated Cradle To trim long pins using the integrated cradle, follow these steps. Place the connector on the cradle as shown in the following illustration. If the center conductor extends past the CUT stanchion on the housing, trim the pin flush with the end of the CUT stanchion.

  • Page 61: Connecting The Rf Cables To The Housing

    RF Cable 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 Housing Follow these steps to connect the RF cables.

  • Page 62: Applying Power To The Hub

    Applying Power to the Hub Overview The Model GS7000 Optical Hub requires input power of 45 to 90 VAC from and external power source. This power is supplied through the RF cables connected to port 3 and/or port 6 on the housing. The incoming AC power is feed to one or two power supply modules which in turn supply four well-regulated DC output voltages to the hub's internal modules, as shown in the following illustration.

  • Page 63

    Applying Power to the Hub Note: Shunts are available with both red and black tops. Use red to indicate that power is applied to that port. Use black to indicate that input power is not applied, but passed. Remove shunts to block AC power at the individual ports. The next step depends on how many power supplies are installed and whether or not you want power to pass through the hub.

  • Page 64: Voltage Check Procedure

    Installation Continue to Voltage Check Procedure. Voltage Check Procedure Always check both AC and DC voltages during initial setup of the Model GS7000 Optical Hub. Follow these steps to check AC and DC voltages. Use a true-rms DVM to check for 45 to 90 VAC input voltage at the AC test point on the power supply module.

  • Page 65: Chapter 3 Setup And Operation

    Chapter 3 Setup and Operation Introduction This chapter describes how to set up and operate the Model GS7000 Optical Hub. These procedures assume the hub is installed according to the procedures in Chapter 2 of this manual. Network Requirements Refer to your network design diagrams during setup. The design diagrams should specify the exact input and output signal levels required for your network.

  • Page 66: Tools And Test Equipment

    Chapter 3 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 67: Ac Entry Module

    7 of the OIB and routed to the AC entry module via one of the cables in the GS7000 molded RF cable pair. The signal is then subjected to a diplex filter and directed by the RF switch to either port 3 or port 6 before being transmitted to the RF plant.

  • Page 68: Optical Passive Modules

    Chapter 3 Setup and Operation Optical Passive Modules NCBC Combiners without Multiplexers/Demultiplexers These modules are only used in the forward path. The narrowcast signal is provided in an 8-fiber ribbon cable using an MPO connector. Broadcast signals are split with either a 1x8 splitter or with two 1x4 splitters. Narrowcast and broadcast signals are combined using integrated BWDMs and connect to the distribution cable using an 8-fiber MPO connector.

  • Page 69: Ncbc Combiners With Integrated Forward Demux And Return Mux

    Optical Passive Modules NCBC Combiners with Integrated Forward Demux and Return Mux This module handles both the forward and reverse path. In the forward path, it splits narrowcast signals with a 1x8 demultiplexer and broadcast input signals with a 1x8 splitter. Narrowcast and broadcast signals are combined using integrated BWDMs and connect to the distribution cable using an 8-fiber MPO connector.

  • Page 70: Ncbc Combiners With Forward Demux

    Chapter 3 Setup and Operation NCBC Combiners with Forward Demux These modules are only used in the forward path. The narrowcast signal is split with a 1x8 demultiplexer. Broadcast signals are split with either a 1x8 splitter or two 1x4 splitters. Narrowcast and broadcast signals are combined using integrated BWDMs and connect to the distribution cable using an 8-fiber MPO connector.

  • Page 71: Dwdm And Cwdm 1x8

    Optical Passive Modules DWDM and CWDM 1x8 This module can be used in the forward and reverse paths. When used in the forward path, the module functions as an optical demultiplexer. Multiple optical wavelengths coming in over a single fiber are injected into the common port of the module, the wavelengths are separated into its frequency wavelengths.

  • Page 72: 1x2, 1x3, 1x4 Couplers

    Chapter 3 Setup and Operation 1x2, 1x3, 1x4 Couplers Optical splitters are used to take a single input signal and split it evenly into a given number of outputs. The following illustration shows examples of the modules. OL-29936-01...

  • Page 73: 1x8 Dual 1x4 Coupler

    Optical Passive Modules 1x8 Dual 1x4 Coupler The 1x8 dual 1x4 coupler allows for input through a single fiber using the 1x8 port or two fibers using the 1x4 ports. The signals are split using a single 1x8 splitter or two 1x4 splitters.

  • Page 74: Bwdm 1x2 Red/blue And 1x4 Filters

    Chapter 3 Setup and Operation BWDM 1x2 Red/Blue and 1x4 Filters These filters can be used in both the forward and reverse paths. The signals are split using a 1x2 and 1x4 multiplexer/demultiplexer respectively. The following illustrations show examples of the modules. OL-29936-01...

  • Page 75: 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. 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 76: Optical Amplifier Module Models

    Refer to Optical Amplifier and Optical Switch Module Pin Adaptor (on page 100) for pin adaptor installation instructions. Optical Amplifier Module Models The following table describes the available EDFA models for the Model GS7000 Optical Hub. Model Description...

  • Page 77: Optical Amplifier Module Diagram

    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 Model GS7000 Hub/Node Status Monitor/Local Control Module Installation and Configuration Guide, part number OL-29937-01, for complete instructions on configuring the EDFA.

  • Page 78

    Chapter 3 Setup and Operation Configurable Parameters The following table defines the configurable parameters for the EDFA. Param Products Function DefaultV Typical Step Unit Name alue Mode Sets operating Constant mode of amplifier Gain (0) Constant Power (1) Enable Enables or Off(0) Off(0) disables amplifier...

  • Page 79

    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 or 45 degC Laser Bias Current Limit...

  • Page 80

    Chapter 3 Setup and Operation [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. [2] This alarm tests for presence of +24V, -6V from the OIB. [3] This alarm indicates the state of the internal voltages (+24V, +5.0V, Vref).

  • Page 81: Broadcast Edfa Power And Gain Setup

    Optical Amplifier (EDFA) Modules Laser Temperature Set Point Adjustment In an effort to reduce EDFA power consumption, the laser temperature set point is changed based on EDFA module temperature and type of laser used. The laser set temperature is between 25° C and 45° C. The actual laser temperature can be in the ±...

  • Page 82

    Chapter 3 Setup and Operation Term Abbreviation Definition Composite output Sum of the power present in all the individual OUT/C power wavelengths at the output of the amplifier. Composite gain Amount of gain the composite input of the power to the amplifier will receive.

  • Page 83: Narrowcast Edfa Power And Gain Setup

    Optical Amplifier (EDFA) Modules GS-EDFA- 13 dB -5 dBm  7 dBm 8 dBm  20 dBm BCST-20-S 14 dB -6 dBm  6 dBm 8 dBm  20 dBm 15 dB -7 dBm  5 dBm 8 dBm  20 dBm 16 dB -8 dBm ...

  • Page 84

    Chapter 3 Setup and Operation The following information is required to select a gain flattened EDFA for a multi-channel system: Maximum number of optical channels for the designed system: N =  Input power per channel: P  IN/λ Required output power per channel: P ...

  • Page 85

    Optical Amplifier (EDFA) Modules At a set gain condition, the EDFA maintains the gain as long as the output power is below the power limit. For example, for GS-EDFA-NCST-17L-SA EDFA, if the set gain is 7 dB, when input power is in the range from -5 dBm to 10 dBm, the output power will be in the range from 2 dBm to 17 dBm.

  • Page 86

    Chapter 3 Setup and Operation 8 Wavelength System An 8 wavelength system is designed to have a maximum capacity of 8 optical channels. The actual number of optical channels at the deployment can be 8 or less. Model Set Gain (Gc) Composite Input (P Composite Output (P IN/C...

  • Page 87

    Optical Amplifier (EDFA) Modules 16 Wavelength System A 16 wavelength system is designed to have a maximum capacity of 16 optical channels. The actual number of optical channels at the deployment can be 16 or less. Model Set Gain (Gc) Composite Input (P Composite Output (P IN/C...

  • Page 88

    Chapter 3 Setup and Operation 24 Wavelength System A 24 wavelength system is designed to have a maximum capacity of 24 optical channels. The actual number of optical channels at the deployment can be 24 or less. Model Set Gain (Gc) Composite Input (P Composite Output (P IN/C...

  • Page 89

    Optical Amplifier (EDFA) Modules 32 Wavelength System A 32 wavelength system is designed to have a maximum capacity of 32 optical channels. The actual number of optical channels at the deployment can be 32 or less. Composite Input (P Composite Output (P Model Set Gain (Gc) IN/C...

  • Page 90

    Chapter 3 Setup and Operation 40 Wavelength System A 40 wavelength system is designed to have a maximum capacity of 40 optical channels. The actual number of optical channels at the deployment can be 40 or less. Model Set Gain (Gc) Composite Input (P Composite Output (P IN/C...

  • Page 91

    Optical Amplifier (EDFA) Modules Constant Power Mode (Optional) Narrowcast EDFAs can optionally be operated in constant power mode. By default, the output power is the nominal output power for the narrowcast EDFA, which is equal to the composite output power at fully loaded condition in the constant gain mode.

  • Page 92: Optical Amplifier Power In And Power Out Test Point Use And Operation

    Chapter 3 Setup and Operation Optical Amplifier Power In and Power Out Test Point Use and Operation The EDFA modules have test points that can be used to monitor input and output power levels when the units are in service. The Power In test point provides a voltage proportional to the optical input power to the EDFA module.

  • Page 93: Power Out Measurement

    Optical Amplifier Power In and Power Out Test Point Use and Operation Power Out Measurement Place the positive (+) lead of a DC voltmeter on the Power Out test point. Place the negative (-) lead of the DC voltmeter on ground. Note: When installed, the metal case of the EDFA module is at ground.

  • Page 94: Optical Switch Module

    Chapter 3 Setup and 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 95: Optical Switch Module Diagram

    Optical Switch Module Important: For mounting in a hub the pin adaptor must be installed with the blue side facing out as shown. Refer to Optical Amplifier and Optical Switch Module Pin Adaptor (on page 100) for pin adaptor installation instructions. Optical Switch Module Diagram The following block diagram shows how the optical switch module functions.

  • Page 96: Optical Switch Operating Parameters

    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 Model GS7000 Hub/Node Status Monitor/Local Control Module Installation and Configuration Guide, part number OL-29937-01, for complete instructions on configuring the optical switch.

  • Page 97

    Optical Switch Module Parameter Function Default Values Step Unit Value ThresholdA 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 rise for the switch to begin the hysteresis timer before restoring...

  • Page 98

    Chapter 3 Setup and 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 99: Status Monitor/local Control Module

    Status Monitor/Local Control Module Overview A local control module and a status monitor are required for the Model GS7000 Optical Hub. 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 100: Local Control Module Description

    Optical switch operating parameters The local control module is equipped with a USB port to allow local control of the optical switches 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 101

    Status Monitor/Local Control Module Note: The local control module can be upgraded to a status monitor through the addition of a transponder core module. The transponder core module plugs directly onto the local control module’s PWB. The mechanical housing for the status monitor and the local control module are the same.

  • Page 102: Power Supply Module

    Setup and Operation Power Supply Module Introduction The Model GS7000 Optical Hub is powered by one or two power supplies. If two power supplies are installed and both are active, the load is shared equally between them. An AC segmentable shunt is available to separate the AC connection to port 3 from that of port 6.

  • Page 103

    Power Supply Module Test points are provided on top of the power supply module for AC input and all output DC voltage rails. The power supply module plugs directly into connectors on the optical interface board, no external cables are required. The primary power supply is installed in slot 2 and the secondary power supply installed in slot 1 as shown in the following illustrations.

  • Page 104: Power Distribution

    Setup and Operation Power Distribution A Model GS7000 Optical Hub can be configured with one or two power supplies. AC input voltage can be routed to both power supplies commonly from either port 3 or port 6 on the housing. In addition, AC input voltages can be routed in a split fashion to the two power supplies.

  • Page 105

    Power Supply Module The power supplies convert the AC input to +24.5, +8.5, -6.0, and +5.5 VDC, which is routed to hub's internal modules via the optical interface board. Refer to Hub Powering Procedure (on page 40) for instructions on applying power to the hub.

  • Page 106: Hub Architecture Examples

    Chapter 3 Setup and Operation Hub Architecture Examples Cisco offers an unlimited range of fiber optic transmission architectures to meet the demands for reliable, scalable and cost-effective broadcast/narrowcast transport services. These HFC architecture examples reflect a scalable transport solution for delivery of advanced services such high-speed data, cable telephony, and video-on-demand.

  • Page 107: Broadcast/narrowcast Overlay With Redundancy

    Hub Architecture Examples Broadcast/Narrowcast Overlay with Redundancy This system diagram is followed by a complete description. OL-29936-01...

  • Page 108

    At the headend a 1550 nm transmitter and EDFA are used to carry broadcast payloads for transport to the Model GS7000 Optical Hub via a ringed network. The two paths are fed into the optical hub that is configured with an optical switch (OPSW) that detects loss or drop of light.

  • Page 109

    Hub Architecture Examples Node Return Transport The Prisma II Baseband Digital Reverse (bdr) technology is used to transport node returns on a single wavelength from the node to the headend. Multiple node laser options available: Analog DWDM/CWDM, BDR DWDM/CWDM. At the node, up to four individual 5 to 42 MHz analog reverse path signals are input to the digital transmitter module.

  • Page 110

    Chapter 3 Setup and Operation Populated Hub The following illustration shows a hub populated with the necessary devices for this example. OL-29936-01...

  • Page 111: Broadcast/narrowcast Overlay With Two Broadcast Zones

    Hub Architecture Examples Broadcast/Narrowcast Overlay with Two Broadcast Zones This system diagram is followed by a complete description. OL-29936-01...

  • Page 112

    Transport for Broadcast Services The Prisma II 1550 nm Optical Transport System is used for delivering broadcast video and broadcast digital services from a headend to the Model GS7000 Optical Hub and nodal service area. This system utilizes externally modulated 1550 nm transmitters in conjunction with EDFAs.

  • Page 113

    Hub Architecture Examples Populated Hub The following illustration shows a hub populated with the necessary devices for this example. OL-29936-01...

  • Page 115: Chapter 4 Maintenance

    Chapter 4 Maintenance Introduction This section describes maintenance procedures for the Model GS7000 Optical Hub. In This Chapter  Opening and Closing the Housing ............. 94  Preventative Maintenance ..............96  Removing and Replacing Modules ............ 99  Care and Cleaning of Optical Connectors ........103...

  • Page 116: Opening And Closing The Housing

    Maintenance Opening and Closing the Housing Overview Installation or maintenance of the Model GS7000 Optical Hub 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 117

    Opening and Closing the Housing OL-29936-01...

  • Page 118: Preventative Maintenance

    Chapter 4 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 119: Cleaning

    Preventative Maintenance What to Inspect How to Inspect Indicators Inspect for:  cracked or missing lenses Wiring and cables Inspect for:  cuts, nicks, burns, or abrasions  exposed bare conductors  sharp bends  pinched or damaged wires  broken or loose lacing, tie wraps, or clamps Cleaning Clean exterior surfaces of the equipment at least annually.

  • Page 120

    Chapter 4 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 121: Removing And Replacing Modules

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

  • Page 122

    Chapter 4 Maintenance Tighten the screws securing the module. Torque screws to 25 to 30 in-lbs (2.8 to 3.4 Nm). Carefully reconnect any optical fibers that were removed from the original module. Clean optical connectors before reconnecting. See Care and Cleaning of Optical Connectors (on page 103) for cleaning procedure.

  • Page 123: Module Replacement Procedure - Passive Modules

    Removing and Replacing Modules Module Replacement Procedure - Passive Modules Follow this procedure to remove and replace the optical passive devices from their mounting tray in the housing base. Open the housing. See Opening and Closing the Housing (on page 94). Carefully tag and remove any optical fibers from the passive module.

  • Page 124

    Chapter 4 Maintenance Using your thumb, press up and back slightly on the plastic retaining tab that secures the metal tab on the top of the module in place in the tray. Tilt the top of the module down and then lift the module out of the tray. Note: You must move the module up slightly to free the small metal tab on the bottom of the module from the mating retaining slot in the tray.

  • Page 125: Care And Cleaning Of Optical Connectors

    Care and Cleaning of Optical Connectors 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 126: To Clean Optical Connectors

    Chapter 4 Maintenance 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 127

    Care and Cleaning of Optical Connectors 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 128

    Chapter 4 Maintenance 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 129: Chapter 5 Customer Information

    Chapter 5 Customer 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 131: Appendix A Technical Information

    Appx auto letter Appendix A Technical Information Introduction This appendix contains tilt, forward and reverse equalizer charts and pad values and part numbers. In This Appendix  Model GS7000 Optical Hub Accessory Part Numbers ....110  Torque Specifications ................. 112 OL-29936-01...

  • Page 132: Model Gs7000 Optical Hub Accessory Part Numbers

    Appendix A Technical Information Model GS7000 Optical Hub Accessory Part Numbers Attenuators The following table provides part numbers and attenuation values for the Model GS7000 Node attenuator pads. Attenuator Pad Value Part Number 0 dB - 1 GHz 589693 0.5 dB - 1 GHz 589694 1.0 dB - 1 GHz...

  • Page 133

    Model GS7000 Optical Hub Accessory Part Numbers Attenuator Pad Value Part Number 12.0 dB - 1 GHz 589717 12.5 dB - 1 GHz 589718 13.0 dB - 1 GHz 589719 13.5 dB - 1 GHz 589720 14.0 dB - 1 GHz 589721 14.5 dB - 1 GHz...

  • Page 134: Torque Specifications

    Appendix A Technical Information Torque Specifications Node Fastener Torque Specifications Be sure to follow these torque specifications when assembling/mounting the node. Fastener Torque Specification Illustration Housing closure bolts 5 to 12 ft-lbs (6.8 to 16.3 Nm) Fiber port plugs 5 to 8 ft-lbs (6.8 to 10.8 Nm) Housing plugs Strand clamp mounting bracket bolts...

  • Page 135: Appendix B Expanded Fiber Tray

    Appx auto letter Appendix B Expanded Fiber Tray Introduction This appendix explains the installation and configuration of the Model GS7000 Optical Hub expanded fiber tray. In This Appendix  Expanded Fiber Tray Overview ............114  Expanded Fiber Tray Installation ............. 116 ...

  • Page 136: Expanded Fiber Tray Overview

    Introduction The expanded fiber tray is an optional replacement for the standard fiber tray in the Model GS7000 GainMaker® Scalable 4-Port 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 137: Tray Components

    Expanded Fiber Tray Overview Tray Components The following illustration shows the unassembled expanded fiber tray components. OL-29936-01...

  • Page 138: Expanded Fiber Tray Installation

    Appendix B 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 139

    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 140

    Appendix B 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. OL-29936-01...

  • Page 141: 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 142: Proper Fiber Routing

    Appendix B 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 143: Connector And Bulkhead Access

    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 144: Passive Device And Bulkhead Mounting

    Appendix B Expanded Fiber Tray Passive Device and Bulkhead Mounting Mounting clips are provided for installing available passive devices and bulkhead adaptors. These clips can be used to mount devices in various orientations in any of the three circular retaining tracks in the expanded fiber tray. The following illustrations show the available mounting clips.

  • Page 145

    Fiber Management System 3-Cartridge Clip The following illustration shows a 3-cartridge clip holding raw WDM cartridges. CWDM Clip The following illustration shows a CWDM clip. Cassette Device Clip The following illustration shows a cassette device clip holding a demultiplexer. OL-29936-01...

  • Page 146: Fiber Installation

    Appendix B Expanded Fiber Tray Fiber Installation For general instructions on installing and routing the fiber optic cables in the hub, refer to the Fiber Optic Cable Installation sections of this manual. OL-29936-01...

  • Page 147: Glossary

    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 148

    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 149

    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 150

    Glossary 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. deviation The peak difference between the instantaneous frequency of the modulated wave and the carrier frequency, in an FM system.

  • Page 151

    Glossary 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. Dense WDM indicates close spacing and more than 4 to 8 wavelengths.

  • Page 152

    Glossary 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. field-effect transistor. A transistor in which the conduction is due entirely to the flow of majority carriers through a conduction channel controlled by an electric field arising from a voltage applied between the gate and source electrodes.

  • Page 153

    Glossary hybrid fiber/coaxial. A network that uses a combination of fiber optics and coaxial cable to transport signals from one place to another. A broadband network using standard cable television transmission components, such as optical transmitters and receivers, coaxial cable, amplifiers, and power supplies.

  • Page 154

    Glossary 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 155

    Glossary RCVR receiver. reverse path Signal flow direction toward the headend. radio frequency. The frequency in the portion of the electromagnetic spectrum that is above the audio frequencies and below the infrared frequencies, used in radio transmission systems. radio frequency interference. return material authorization.

  • Page 156

    Glossary SNMP simple network management protocol. A protocol that governs network management and the monitoring of network devices and their functions. synchronous transmission A transmission mode in which the sending and receiving terminal equipment are operating continuously at the same rate and are maintained in a desired phase relationship. torque A force that produces rotation or torsion.

  • Page 157: Index

    Index Broadcast EDFA Power and Gain Setup • 59 Broadcast/Narrowcast Overlay with Redundancy • 85 16 Wavelength System • 65 1x2, 1x3, 1x4 Couplers • 50 Broadcast/Narrowcast Overlay with Two Broadcast Zones • 89 1x8 Dual 1x4 Coupler • 51 BW •...

  • Page 158

    FM • 130 Maintenance • 93 frequency • 130 Mbps • 132 frequency agile • 130 Model GS7000 Optical Hub Accessory Part frequency response • 130 Numbers • 110 FSC Color Code and Assignment • 20 Model Number Matrix • 9 ft-lb •...

  • Page 159

    Index NCBC Combiners without Multiplexers/Demultiplexers • 46 Nm • 132 RCM • 132 RCVR • 133 node opening and closing • 94 Recommended Equipment • 103 Node Fastener Torque Specifications • 12, 112 Removing and Replacing Modules • 99 Node Return Transport • 87, 90 Required Tools and Test Equipment •...

  • Page 160

    Index V • 134 Visual Inspection • 96 Voltage Check Procedure • 42 W • 134 OL-29936-01...

  • Page 162

    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 the Cisco Systems, Inc. trademarks used in this document. Product and service availability are subject to change without notice.

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