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Poor C/N Performance

145

Notes

These notes apply to the previous troubleshooting flowchart.

Note

Description

1

RF drive level to the laser must be set to the laser manufacturer’s specification.

2

It is possible that the distribution module is set up incorrectly. See the pad and
equalizer selection charts in Appendix A for correct pad and equalization. The
C/N performance will suffer if the RF levels are too low into the first gain stage
or the interstage.

3

It is important to monitor the DC level at the receiver module because in the
process of cleaning the connectors, the transfer of light through each connector
may improve or degrade. The DC reading should degrade if there is a reflection
in the path depending on the severity of the core mismatch. Scratches on the
surface of the fiber of the connector can cause reflections. Scratched connectors
must be replaced.

4

For standard receiver

For low input receiver

Attenuate the light to simulate the
amount of light that should be at the
1.2 GHz GS7000 Node and rerun the
C/N performance. Add components
into the path one at a time until the
problem is found. Change jumpers,
couplers, fibers and connectors one at
a time, taking C/N measurements
after each change.
A phenomenon called “shot noise”
will occur if the light level is too high
into the receiver. This is noise
generated by the photo diode when
the light is converted back to RF. An
optical input level exc2 dBm
at the detector will also generate
distortions.

Attenuate the light to simulate the
amount of light that should be at the
1.2 GHz GS7000 Node and rerun the
C/N performance. Add components
into the path one at a time until the
problem is found. Change jumpers,
couplers, fibers and connectors one at
a time, taking C/N measurements
after each change.
A phenomenon called “shot noise”
will occur if the light level is too high
into the receiver. This is noise
generated by the photo diode when
the light is converted back to RF. An
optical input level exceeding -2 dBm at
the detector will also generate
distortions.

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Содержание GS7000

Страница 1: ...Cisco 1 2 GHz GS7000 Node Installation and Operation Guide ...

Страница 2: ......

Страница 3: ...f the flash points to the terminal device You may find this symbol affixed to the product This symbol indicates a protective ground terminal You may find this symbol affixed to the product This symbol indicates a chassis terminal normally used for equipotential bonding You may find this symbol affixed to the product This symbol warns of a potentially hot surface You may find this symbol affixed to...

Страница 4: ...he right to change this publication at any time without notice This document is not to be construed as conferring by implication estoppel or otherwise any license or right under any copyright or patent whether or not the use of any information in this document employs an invention claimed in any existing or later issued patent Copyright 2015 Cisco and or its affiliates All rights reserved Printed ...

Страница 5: ...n Module 34 Optical Interface Board OIB 38 Optical Receiver Module 39 Optical Analog Transmitter Modules 43 Optical Amplifier EDFA Modules 45 Optical Switch Module 52 Local Control Module 58 Power Supply Module 61 Installation 65 Tools and Test Equipment 66 Node Housing Ports 68 Strand Mounting the Node 69 Pedestal or Wall Mounting the Node 72 Fiber Optic Cable Installation 74 RF Cable Installatio...

Страница 6: ...on 142 Poor C N Performance 144 Poor Distortion Performance 146 Poor Frequency Response 148 No RF Output from Reverse Receiver 150 Customer Support Information 151 Appendix A Technical Information 153 Linear Tilt Chart 154 Forward Equalizer Chart 156 Appendix B Enhanced Digital Return Multiplexing Applications 158 Enhanced Digital Return System Overview 159 Enhanced Digital Return EDR System Insta...

Страница 7: ...Contents v Glossary 213 Index 225 ...

Страница 8: ......

Страница 9: ... expected to use their experience and technical skills to avoid possible injury to themselves and others due to hazards that exist in service and restricted access areas User and Operator The terms user and operator apply to persons other than service personnel Ground ing and Earth ing The terms ground ing and earth ing are synonymous This document uses ground ing for clarity but it can be interpr...

Страница 10: ...he installation operation Ensure that the strand can safely support the equipment s weight Pedestal Service Closet Equipment Room or Underground Vault Installation WARNING Avoid the possibility of personal injury Ensure proper handling lifting techniques are employed when working in confined spaces with heavy equipment Ensure this equipment is securely fastened to the mounting surface or rack wher...

Страница 11: ... the IEC 60417 5020 chassis icon the installer should refer to CENELEC standard EN 50083 1 or IEC standard IEC 60728 11 for correct equipotential bonding connection instructions General Servicing Precautions WARNING Avoid electric shock Opening or removing this equipment s cover may expose you to dangerous voltages CAUTION These servicing precautions are for the guidance of qualified service perso...

Страница 12: ... putting it back into operation Electrostatic Discharge Electrostatic discharge ESD results from the static electricity buildup on the human body and other objects This static discharge can degrade components and cause failures Take the following precautions against electrostatic discharge Use an anti static bench mat and a wrist strap or ankle strap designed to safely ground ESD potentials throug...

Страница 13: ... modifications to this equipment Any changes or modifications could void the user s authority to operate this equipment Modifications have the potential to degrade the level of protection built into this equipment putting people and property at risk of injury or damage Those persons making any modifications expose themselves to the penalties arising from proven non compliance with regulatory requi...

Страница 14: ...diate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case users will be required to correct the interference at their own expense Industry Canada Industrie Canadiene Statement This apparatus complie...

Страница 15: ...ipment if the fiber is unmated or unterminated Do not stare into an unmated fiber or at any mirror like surface that could reflect light emitted from an unterminated fiber Do not view an activated fiber with optical instruments e g eye loupes magnifiers microscopes Use safety approved optical fiber cable to maintain compliance with applicable laser safety requirements Warning Fiber Optic Cables WA...

Страница 16: ...the appropriate section of the equipment documentation For safe operation of this software refer to the following warnings WARNING Ensure that all optical connections are complete or terminated before using this equipment to remotely control a laser device An optical or laser device can pose a hazard to remotely located personnel when operated without their knowledge Allow only personnel trained i...

Страница 17: ...al amplifier for various amplifier configurations is defined in the following table Output Power Maximum Output CDRH Classification IEC 60825 1 Classification IEC 60825 2 Hazard Level 17 dBm 17 dBm 1 1M 1M 20 dBm 20 dBm 1 1M 1M 22 dBm 22 dBm 1 1M 3B Warning Labels One or more of the labels shown below are located on this product ...

Страница 18: ...Laser Warning Labels xvi Location of Labels on Equipment The following illustrations display the location of warning labels on this equipment ...

Страница 19: ...Laser Warning Labels xvii ...

Страница 20: ......

Страница 21: ...1 Introduction This manual describes the installation and operation of the 1 2 GHz GS7000 Node 1 Chapter 1 General Information In This Chapter Equipment Description 2 ...

Страница 22: ... 2 GHz GS7000 node is painted white and the pictures in this document which use unpainted housings are used as references The base of the housing contains an RF amplifier module AC power routing forward and reverse configuration modules configuration will vary The lid of the housing contains a fiber management tray and track included in all nodes optical receiver and transmitter modules configurat...

Страница 23: ...Equipment Description 3 The following illustration shows the external housing of the 1 2 GHz GS7000 Node ...

Страница 24: ...ode The 1 2 GHz GS7000 Node is used in broadband hybrid fiber coax HFC networks It is configured with the receivers transmitters configuration modules and other modules to meet your unique network requirements This platform allows independent segmentation and redundancy for both the forward and reverse paths in a reliable cost effective package ...

Страница 25: ...segmented or combined and routed to up to four DFB reverse optical transmitters or up to four Enhanced Digital Return reverse optical transmitters as part of our EDR system Redundant back up transmitters may be utilized In addition an auxiliary input path is provided for reverse signal injection 5 210 MHz Reverse segmentation and or redundancy are determined by the type of Reverse Configuration Mo...

Страница 26: ...dule SM LCM in the node A specific model of the SM LCM is required for use in the hub node This SM LCM model monitors and controls several EDFA and optical switch parameters and functions while continuing to monitor the standard node components Features The 1 2 GHz GS7000 Node has the following features Six port 1 2 GHz RF platform Uses rugged GaN Technology on the output stage Uses standard GainM...

Страница 27: ...ism from the rear of the housing base Dual Split AC powering Space provided for mounting WDM modules inside the housing lid Node Inputs Outputs Diagram The following diagram shows the system level inputs and outputs of the 1 2 GHz GS7000 Node The AC can be applied to any RF port and routed if required to the other ports The DC power supply modules can be fed by any RF port 1 through 6 Modules Func...

Страница 28: ... This module splits the signals equally to the inputs of the RF amplifier module The 1x4 Forward Configuration Modules with forward RF injection are similar to the 1x4 Forward Configuration Modules but are used with the Forward Local Injection FLI Module The FLI Module routes an RF signal from an external source to the Forward Configuration Module which is then coupled with other inputs from an op...

Страница 29: ...ith redundancy in the forward direction Receivers 1 primary and 2 redundant are routed to RF amplifier Ports 4 and 5 6 while Receivers 3 primary and 4 redundant are routed to RF amplifier Ports 1 and 2 3 The active receiver is selected with a status monitor or local control monitor The 3x4 Forward Configuration Module is used when the 1 2 GHz GS7000 Node is configured with three receivers each fee...

Страница 30: ...h reverse RF inputs from Ports 3 6 and routed to Transmitter 1 The 4x2 Redundant Reverse Configuration Module combines reverse inputs from Ports 1 and 2 3 and routes them to Transmitters 1 and 2 it also combines reverse inputs from Ports 4 and 5 6 and routes them to Transmitters 3 and 4 The 4x3 Reverse Configuration Module with auxiliary reverse RF injection is available in two types The left comb...

Страница 31: ...SC APC fiber connector is standard Multiple transmitter options are available such as uncooled DFB 1550 ITU and EDR EDR uses the included LC APC connector that jumps over to an SC APC bulkhead Optical power test points and status LEDs are provided Optical Amplifier EDFA Erbium doped fiber amplifier modules are available in two categories broadcast and narrowcast gain flattened EDFAs are available ...

Страница 32: ...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 two power supplies powered by different AC sources two power supplies using the same AC source a single supply using a single AC source Fiber Management Tray and Track The fiber man...

Страница 33: ...ured 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 Note Please consult with your Account Representative Customer Service Representative or System Engineer to determine the best configuration for your particular applicat...

Страница 34: ......

Страница 35: ...nal optical switch optional a status monitor optional or a local control module optional one or two power supplies and a fiber management tray track The base houses the RF amplifier module and the accessories that plug into it These accessories include a forward configuration module four forward band linear equalizer modules multiple attenuator pads two node signal director jumper or splitter modu...

Страница 36: ...r Distribution 23 RF Amplifier Module 24 Forward Configuration Module 29 Reverse Configuration Module 34 Optical Interface Board OIB 38 Optical Receiver Module 39 Optical Analog Transmitter Modules 43 Optical Amplifier EDFA Modules 45 Optical Switch Module 52 Local Control Module 58 Power Supply Module 61 ...

Страница 37: ...ss AC Byp ass AC Byp ass RS reverse switch XMTR Laser Diode TP P RCVR Photo Diode P Status Monitor Local Control Module 1x4 Forward Configuration Module 4x1 Reverse Configuration Module w Aux Reverse RF Injection Fiber Tray Power Supply 2 RCVR 1 XMT R 1 Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP Thermal Thermal ...

Страница 38: ...Chapter 2 Theory of Operation 18 Left Right Segmented ...

Страница 39: ...erse Configuration Module w Aux Reverse RF Injection Fiber Tray Power Supply 2 RCVR 1 RCVR Photo Diode P RCVR 2 RCVR Photo Diode P RCVR 3 RCVR Photo Diode P RCVR 4 XMT R 1 XMTR Laser Diode TP P XMT R 2 XMTR Laser Diode TP P XMT R 3 XMTR Laser Diode TP P XMT R 4 Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP Thermal ...

Страница 40: ...Chapter 2 Theory of Operation 20 Functional Diagram Hub Node The following diagram shows the signal flow through a 4 way non segmented hub node ...

Страница 41: ...independent forward amplification paths in the RF amplifier module The 1X4 FCM splits the RF signals entering it equally between the four forward amplification paths in the RF amplifier module 4 Each of the forward amplification paths in the RF amplifier module is composed of one input amplification stage and one interstage amplification stages in series followed by a power doubler output amplific...

Страница 42: ... Each of the reverse amplification paths in the RF amplifier module also contains padding trimming filtering 6 db wink and RF On Off switch circuitry 4 The RCM determines how RF signals from the different node output ports are combined and routed to the four transmitter module paths on the Optical Interface Board OIB The 4X1 RCM combines the reverse path signals from the four node output ports tog...

Страница 43: ...e 2 The power supply module s convert s the AC input to 24 5 8 5 6 0 and 5 5 V DC 3 The 24 5 8 5 6 0 and 5 5 V DC lines are routed to 1 2 GHz GS7000 Node internal modules 4 If two power supplies are installed and both are active the load is shared equally between them 5 An AC segmentable shunt is available to separate the AC connection to ports 1 3 from that of ports 4 6 This allows the node to be...

Страница 44: ...in Block Aux Reverse Injection Director Node Signal Director Splitter Interstage GaAs Gain Block Output GaN Gain Block Tilt Pad EQ Pad Pad Pad EQ Pad Pad Pad Ther Ther Interstage GaAs Gain Block RF Switch RF Switch E Pad D 210 MHz Aux Reverse Injection Option F DC Switch G J Surge Protection AC 1 Power Rev TP Fwd TP Rev TP Fwd TP Fwd TP Rev TP AC AC AC Aux Reverse Injection Director Node Signal Di...

Страница 45: ...al circuit on the RF amplifier module is designed to compensate for the RF forward path thermal movement of the entire node RF station This includes the forward path amplifier module circuitry RF cables and optical interface board Reverse Amplifier PWB Reverse Amplifier IC with Integrated Attenuator Digital Att Off 0 6 dB Trim RF Switch Trim RF Switch Trim RF Switch Trim RF Switch Reverse Amplifie...

Страница 46: ...nd linear equalizer modules of other values are available This allows the nodes forward path tilt to be adjusted as needed The forward band linear equalizer module is a plug in field accessible module See the equalizer charts in Appendix A Technical Information Node Signal Director Jumper Splitter Module The node signal director jumper splitter module is a plug in field accessible module It is pre...

Страница 47: ...se test point an input pad and a reverse auxiliary jumper amplifier termination module Signals from port 3 or port 6 of the nodes auxiliary path are directed by the reverse auxiliary jumper amplifier termination module to the reverse configuration module Reverse Configuration Module The reverse configuration module determines the reverse path topology in the RF amplifier module and 1 2 GHz GS7000 ...

Страница 48: ...ers 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 ...

Страница 49: ...ion Module is used when the 1 2 GHz GS7000 Node is configured with a single optical receiver routed to all four outputs of the RF amplifier module This module splits the signals equally to the inputs of the RF amplifier module The following diagram shows how this module functions 1x4 Forward Configuration Modules with Forward RF Injection Description The 1x4 Forward Configuration Modules with forw...

Страница 50: ...al signal from the status monitor local control module The following diagram shows how this module functions 1x4 Redundant Forward Configuration Modules with Forward RF Injection Description The 1x4 Redundant Forward Configuration Modules with forward RF injection are similar to the 1x4 Redundant Forward Configuration Modules but are used with the Forward Local Injection FLI Module The FLI Module ...

Страница 51: ...ons 2x4 Redundant Forward Configuration Modules Description The 2x4 Redundant Forward Configuration Module is used when the 1 2 GHz GS7000 Node is configured with four optical receivers with each pair feeding two RF outputs of the amplifier module in a redundant configuration In this configuration the node serving area is divided in half for redundancy in the forward direction Receivers 1 primary ...

Страница 52: ...4 1 3 4 FCM can only be used with the 4 way RF amplifier module The following diagram shows how this module functions 3x4 1 2 4 Forward Configuration Module Description The 3x4 1 2 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 5 6 Recei...

Страница 53: ...cal receivers with each feeding separate RF outputs of the amplifier module Receiver 1 is routed to RF amplifier Ports 5 6 Receiver 2 is routed to RF amplifier Port 4 Receiver 3 is routed to RF amplifier Port 1 Receiver 4 is routed to RF amplifier Ports 2 3 Note The 4x4 FCM can only be used with the 4 way RF amplifier module The following diagram shows how this module functions ...

Страница 54: ...ary Reverse RF Injection Description The 4x1 Reverse Configuration Module with auxiliary reverse RF injection combines all four reverse RF inputs Ports 1 2 3 4 and 5 6 of the node and routes the signal to Transmitter 1 An RF signal from an external source can optionally be injected and coupled with the reverse RF inputs on Ports 3 6 and routed to Transmitter 1 The following diagram shows how this ...

Страница 55: ...d and coupled with reverse RF inputs from Ports 3 6 and routed to Transmitter 1 Note This module can only be used with an 8 port optical interface board There is no transmitter 3 position with a 6 port optical interface board The following diagram shows how this module functions 4x2 Redundant Reverse Configuration Module Description The 4x2 Redundant Reverse Configuration Module combines reverse i...

Страница 56: ...e reverse RF input from Port 1 and routed to Transmitter 1 The following diagram shows how this module functions 4x3 1 3 4 Reverse Configuration Module withAuxiliary Reverse RF Injection Description The 4x3 1 3 4 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 routes reverse inputs from Port 4 to...

Страница 57: ... 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 Note This module is typically installed when using EDR multiplexing digital reverse modules Since the digital reverse module occupies the physical space that transmitters 3 and 4 normally occupy in the node base this reverse configuration m...

Страница 58: ...etween the housing lid and base also plug into the OIB The OIB is field replaceable All optical modules power supplies RF cables power cables and OIB mounting screws must be removed in order to remove the OIB from the housing lid The upstream status monitoring signal goes through LPF then splits Splitter output 1 goes through a 17dB coupler into transmitter 1 input Splitter output 2 goes through a...

Страница 59: ...t points are provided and are accessible through holes in the module housing The optical power test points for the optical receiver module has a scaling ratio of 1 V 1 mW A 20 dB RF power test point is accessible through the front panel The optical receiver module has an optical power LED to indicate the presence of optical power that is either above or below the specified range ON indicates optic...

Страница 60: ...Optical Receiver The optical input range for the low input receiver is 0 1 w to 0 63 w 10 dBm to 2 dBm Compared to the standard input optical receiver the optical input range is 6 dBm to 2 dBm 0 25 w to 1 58 w the low input optical receiver can work with lower optical input level in order to support fiber deep applications ...

Страница 61: ...ptical receiver please refer to the latest GS7000 Data Sheet 29 0 29 5 30 0 30 5 31 0 31 5 32 0 32 5 33 0 33 5 34 0 34 5 35 0 35 5 36 0 36 5 2 25 2 50 2 75 3 00 3 25 3 50 3 75 4 00 Minimum RF Output Level dBmV 6dBm Optical Input Power Transmitter OMI per Channel 1310nm 1550nm 21 0 21 5 22 0 22 5 23 0 23 5 24 0 24 5 25 0 25 5 26 0 26 5 27 0 27 5 28 0 28 5 2 25 2 50 2 75 3 00 3 25 3 50 3 75 4 00 Min...

Страница 62: ...Chapter 2 Theory of Operation 42 Optical Receiver Module Diagram The following diagram shows how the optical receiver module functions ...

Страница 63: ...ers fiber pigtail to be spooled up and contained within the transmitter module This greatly improves fiber management within the node The optical transmitter modules plug directly into the optical interface board via a connector header and are secured in place with two screws Output attenuator pads are provided on the optical interface board for each transmitter mounted in the housing lid RF test ...

Страница 64: ...Chapter 2 Theory of Operation 44 OpticalAnalog Transmitter Module Diagram This illustration shows how the optical analog transmitter module functions ...

Страница 65: ...nge between 1536 nm and 1562 nm Broadcast EDFAs are available in 17 dBm 20 dBm and 22 dBm versions Narrowcast gain flattened EDFAs are available in 17 dBm 20 dBm and 21 dBm versions to fit any architecture for requirements like DWDM narrowcasting Both broadcast and gain flattened EDFAs can be operated in constant power and constant gain modes The default setting for a broadcast EDFA is constant po...

Страница 66: ...ceiver or transmitter slots on the optical interface board in the node lid using a reversible pin adaptor The pin adaptor is used to adapt the module to the connector arrangement for a transmitter slot or a receiver slot which are different To mount the module in a transmitter slot the red side of the pin adaptor must face out To mount the module in a receiver slot the blue side of the pin adaptor...

Страница 67: ...eference 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 Configurable Parameters The following table defines the configurable parameters for the EDF...

Страница 68: ... level B 22 19 22 22 0 1 dBm GF 17 Sets optical output level B 17 14 17 17 0 1 dBm GF 21 Sets optical output level B 21 18 21 21 0 1 dBm Set Gain BCST 17 Sets gain level in Constant Gain Mode A B 12 10 12 14 0 1 dB BCST 20 Sets gain level in Constant Gain Mode A B 15 13 15 17 0 1 dB BCST 22 Sets gain level in Constant Gain Mode A B 17 15 17 19 0 1 dB GF 17L A 7 5 7 9 0 1 dB GF 17H A 12 10 12 14 0 ...

Страница 69: ... Thermoelectric cooler current 0 25 A Module Temperature Module temperature 26 5 degC Laser On Time Time the laser has been on 1 0 Hrs Alarm Parameters The following table defines the alarm parameters for the EDFA Alarm Name Major High Minor High Minor Low Major Low Values Typical Value Hysteresis Units Laser Bias Current 0 001 0 010 na na Ok Alarm 0 625 0 001 A Optical Output Level 1 0 0 7 0 7 1 ...

Страница 70: ...for input power alarm values Input Power Alarm Parameters The following tables define the input power alarm parameters for the EDFA Gain flattened EDFA Constant Gain Mode Default Product Type Major High Minor High Minor Low Major Low Values Typical Value Hysteresis Units 17 0 20 0 21 0 dBm Low Gain 45 0 25 0 8 0 10 0 Ok Alarm 7 0 0 1 dBm 17 0 20 0 21 0 dBm High Gain 45 0 25 0 13 0 15 0 Ok Alarm 12...

Страница 71: ...0 0 C laser set point temperature is set at 25 C For every degree of module temperature greater than 60 C laser set point temperature is also increased by that amount until module temperature reaches 70 C then laser temperature set point is fixed at 35 C For example if module temperature is 64 C laser set point temperature is 29 C If module temperature is 85 C laser set point temperature is 35 C C...

Страница 72: ...ch when the light level drops below the threshold value set by the operator In manual mode the switch can be triggered through the Local Control Module LCM The module mounts in receiver or transmitter slots on the optical interface board in the node lid using a reversible pin adaptor The pin adaptor is used to adapt the module to the connector arrangement for a transmitter slot or a receiver slot ...

Страница 73: ...ameters 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 configuring the optical switch ...

Страница 74: ...to Path B Path B Optical Power ThresholdB User Setting Path A Optical Power ThresholdA 1 Loss of Input Light at Path B Switch to Path A Optical Power Path B Optical Power ThresholdB User Setting Path A Optical Power ThresholdA 1 Loss of Input Light at Path A Switch to Path B Path B Optical Power ThresholdB User Setting Path A Optical Power ThresholdA 1 Both Dark Switch to Path B Optical Power 1 Hy...

Страница 75: ... Revert is On 1 0 0 5 9 5 0 1 dB Hysteresis Time Hysteresis Time The length of time in seconds that primary optical power must remain above the restore threshold before switch is allowed to revert to primary position Only applies if Revert is On 60 0 600 1 sec Revert On 1 allows switch to revert to primary position after optical power restored In Off 0 switch will remain in backup non primary posi...

Страница 76: ...owing table defines the alarm parameters for the optical switch Alarm Name Error Condition Values Hysteresis Loss of Input Light at Path A Optical input at path A is less than the switching threshold at path A Minor Alarm 0 Ok 1 1 Loss of Input Light at Path B Optical input at path B is less than the switching threshold at path B Minor Alarm 0 Ok 1 1 Both Dark Loss of light at both inputs Loss of ...

Страница 77: ...e 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 ...

Страница 78: ...nals are monitored and their status reported to the headend by the status monitor Receiver optical input level all receivers Transmitter optical output level all transmitters AC power presence and peak voltage for split AC powering cases AC power from both sides of node housing is monitored DC voltages from both primary and redundant power supplies Optical amplifier operating parameters Optical sw...

Страница 79: ...put level all receivers Transmitter optical output level all transmitters AC power presence and peak voltage for split AC powering cases AC power from both sides of node housing is monitored DC voltages from both primary and redundant power supplies Optical amplifier operating parameters Optical switch operating parameters The local control module communicates serially with the RF amplifier module...

Страница 80: ...al 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 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 t...

Страница 81: ... duration AC surges into load power The power supply is a constant power device meaning that it automatically adjusts its internal operating parameters for the most efficient use of the different levels of input voltage and current it will receive within the cable plant The DC output voltages generated by the power supply at given load currents are shown below 24 5 VDC 6 2 Amps 8 5 VDC 1 0 Amps 5 ...

Страница 82: ...ode output port In addition AC input voltages can be routed in a split fashion to the two power supplies AC input voltages from the left half of the node output ports 1 3 can be routed to power supply 1 independent of AC input voltages from the right half of the node output ports 4 6 being routed to power supply 2 Each of the power supplies output voltage rails is diode OR d within the supply This...

Страница 83: ...e optimal configuration by summing the power consumption of the RF amplifier plus the other individual modules in the housing using the following table Important Do not populate the housing with any combination of modules that would draw more than the available power of 100 watts The following table lists the modules and their respective power consumption Equipment Type Maximum Power Draw Watts Ty...

Страница 84: ...Chapter 2 Theory of Operation 64 1 1 EDR Transmitter 3 2 1 EDR Transmitter 7 ...

Страница 85: ...1 2GHz GS7000 Node 3 Chapter 3 Installation In This Chapter Tools and Test Equipment 66 Node Housing Ports 68 Strand Mounting the Node 69 Pedestal or Wall Mounting the Node 72 Fiber Optic Cable Installation 74 RF Cable Installation 82 Applying Power to the Node 85 ...

Страница 86: ...eter DVM EXFO FOT 22AX optical power meter with adapters Optical connector cleaning supplies Optical connector microscope with appropriate adapters for your optical connectors 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 Test point po...

Страница 87: ...cation Illustration RF Amplifier assembly shoulder screws cross head screw 18 to 20 in lbs 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 ...

Страница 88: ...cation 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 External Test Points Activated option When replacing test point port plugs torque from 5 to 8 ft lbs 6 8 to 10 8 Nm ...

Страница 89: ...an safely support the node s maximum weight A fully loaded 1 2 GHz GS7000 Node weighs over 50 lbs 22 7 kg Ensure the ground area below the installation site is clear of personnel before hoisting the node If possible block off walkway below the hoisting area to prevent pedestrian traffic during hoisting Failure to observe these admonishments can result in serious injury or death 1 Check the strand ...

Страница 90: ...ft the housing into proper position on the strand 4 Slip the clamps over the strand and finger tighten the clamp bolts This allows additional side to side movement of the housing as needed 5 Move the housing as needed to install the coaxial cable and connectors See the illustrations below for an example Powered from Left Powered from Right ...

Страница 91: ...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 7 Connect the coaxial cable to the pin connector according to the pin connector manufacturer s specifications 8 Continue to Fiber Optic Cable Installation on page 74 and RF Cable Installation o...

Страница 92: ...e 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 Failure to observe these admonishments can result in serious injury or death 1 Remove the cover of the pedestal 2 Remove the self tapping bolts from the strand clamps if pre...

Страница 93: ...orizontally as shown to ensure proper airflow over the housing cooling fins Do NOT mount the node housing vertically 4 Secure the node housing to the pedestal bracket using the strand clamp bracket bolts you removed in step 2 Insert the bolts into the mounting holes Use the strand clamps as spacers if necessary Torque the bolts from 8 ft lb to 10 ft lb 10 8 Nm to 13 6 Nm 5 Connect the coaxial cabl...

Страница 94: ... optic cable installation is a critical procedure Incorrect installation can result in severely degraded 1 2 GHz GS7000 Node performance Be sure to carefully follow fiber connector manufacturer s instructions See Care and Cleaning of Optical Connectors on page 134 Color Code Fiber connectors and adapters are labeled with the following color code Note This is only a suggested setup Your fiber assig...

Страница 95: ...ing the insertion of the fibers and for installation or replacement of the node power supplies The fiber routing track provides a channel for routing fiber pigtails to their appropriate optical modules as well as a location to snap in unused fiber connectors for storage The following illustration shows the design of the fiber tray Note Fibers are spooled in a counterclockwise direction in the tray...

Страница 96: ...Chapter 3 Installation 76 ...

Страница 97: ...er to this product if the fiber is unmated or unterminated Do not stare into an unmated fiber or at any mirror like surface that could reflect light that is emitted from an unterminated fiber Do not view an activated fiber with optical instruments 1 The first step depends on whether the fiber optic cable is factory installed or not IF THEN fiber optic cable is factory installed splice fiber pigtai...

Страница 98: ...er routing channel below 4 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 Do not bend or kink fibers Though not necessary you can also remove the power supplies and open the fiber routing channel cover for additional access ...

Страница 99: ...Fiber Optic Cable Installation 79 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 ...

Страница 100: ...tor and fiber port and shrink in place 9 Identify individual fibers according to their color code and determine to which receiver or transmitter module each fiber will connect 10 Pivot the fiber tray back down and snap it into place on top of the power supply with its locking tabs 11 Open the fiber tray cover and carefully wind the fibers around the spool in a counterclockwise direction Be sure to...

Страница 101: ...o the procedures in Care and Cleaning of Optical Connectors on page 134 14 Open the receiver or transmitter module fiber connector cover Carefully slide the fiber connector into the module connector until it clicks 15 Repeat steps 12 and 13 for each receiver and transmitter module 16 Splice fiber pigtail of optical fiber input cable to your splice enclosure 17 Continue to RF Cable Installation on ...

Страница 102: ...the Center Conductor The 1 2 GHz GS7000 Node requires pin type connectors for all RF connections Standard pin connectors with pins extending 1 5 in to 1 6 in 3 8 cm to 4 064 cm from connector shoulder require no trimming You must trim longer pins before inserting them into the housing Trimming Using the Integrated Cradle To trim long pins using the integrated cradle follow these steps 1 Place the ...

Страница 103: ... flush with the end of the CUT stanchion 3 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 1 Place the connector above the entry port so that it lines up with its installed position ...

Страница 104: ...ration The pin length must be 1 6 inches 4 064 cm Trim pin if necessary before installation See Trimming the Center Conductor on page 82 Note Assemble each RF connector to its cable according to manufacturer s instructions 3 Remove the sealing plug of each port to which cables connect Note that Ports 1 3 4 and 6 have the option of a vertical or horizontal connection 4 Insert the appropriate coaxia...

Страница 105: ...ling AC shunts for the ports through which you want to pass AC power An AC segmentable shunt is provided to configure power direction between the two sides of the node The following schematic diagram illustrates 1 2 GHz GS7000 Node powering Node Powering Procedure Follow these steps to apply power 1 Determine which of the RF cables carry 45 to 90 V AC input power 2 Install shunts in the locations ...

Страница 106: ...1 2 and 3 to right side of housing Ports 4 5 and 6 ensure that the AC segmentable shunt is installed power is to be blocked between left side of housing Ports 1 2 and 3 and right side of housing Ports 4 5 and 6 ensure that the AC segmentable shunt is removed Ports 1 2 and 3 are powered from one source and Ports 4 5 and 6 are powered from another source ensure that the AC segmentable shunt is remov...

Страница 107: ... point on the power supply module 2 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 3 Verify that the Power ON LED on the receiver module is on 4 Carefully close the housing lid See Opening and Closing the Housing on page 122 ...

Страница 108: ......

Страница 109: ...g setup The design diagrams should specify the exact input and output signal levels required for your network The 1 2 GHz GS7000 Node is configured to have a specific amount of gain at 18 dB of linear tilt from 52 MHz to 1218 MHz 4 Chapter 4 Setup and Operation In This Chapter Tools and Test Equipment 90 System Diagrams 91 Forward Path Setup Procedure 97 Reverse Path Setup Procedure 101 Reconfigur...

Страница 110: ...or equivalent true rms digital voltmeter DVM with 0 001 resolution Signal generator capable of generating carriers at 55 25 MHz and 1 2GHz F barrel adapter 1 2 GHz Field strength meter capable of measuring up to 1 2GHz Field sweep receiver transmitter with a minimum bandwidth of 1 2 GHz EXFO FOT 22AX optical power meter with adapters Fiber optic jumper to test transmitter optical output power Glen...

Страница 111: ...ss AC Byp ass AC Byp ass RS reverse switch XMTR Laser Diode TP P RCVR Photo Diode P Status Monitor Local Control Module 1x4 Forward Configuration Module 4x1 Reverse Configuration Module w Aux Reverse RF Injection Fiber Tray Power Supply 2 RCVR 1 XMT R 1 Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP Thermal Thermal ...

Страница 112: ...Chapter 4 Setup and Operation 92 Left Right Segmented ...

Страница 113: ...erse Configuration Module w Aux Reverse RF Injection Fiber Tray Power Supply 2 RCVR 1 RCVR Photo Diode P RCVR 2 RCVR Photo Diode P RCVR 3 RCVR Photo Diode P RCVR 4 XMT R 1 XMTR Laser Diode TP P XMT R 2 XMTR Laser Diode TP P XMT R 3 XMTR Laser Diode TP P XMT R 4 Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad Pad 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP 20 dB Rev TP Thermal ...

Страница 114: ...Chapter 4 Setup and Operation 94 Functional Diagram Hub Node The following diagram shows the signal flow through a 4 way non segmented hub node ...

Страница 115: ... that shows the functional signal flow and identifies each field replaceable component Some of these components pads equalizers and node signal directors are removed and replaced with different value components during the setup procedures 4 Way Forward Segmentable Node RF Assembly The following illustrations show the 4 way forward segmentable node RF assembly Left side Ports 1 2 and 3 illustration...

Страница 116: ...Chapter 4 Setup and Operation 96 Right side Ports 4 5 and 6 illustration ...

Страница 117: ...er with no safety interlocks Under no circumstances should connectors be viewed with equipment enabled Direct viewing of connectors can cause eye damage Failure to adhere to this admonishment may result in serious injury to the eye s or even blindness CAUTION Disconnecting the optical fibers of a working network element will interrupt customer service Note Ensure all optical connectors are clean S...

Страница 118: ... level should be 7 dBmV at the test point with 0 dBm optical input power and 2 5 index modulation of the laser headend transmitter With optical receiver attenuator set to the 8 dB switch setting This represents an optical receiver output of 27 dBmV For low input receiver follow the same process to check the RF level and refer the table below For standard receiver For low input receiver Att OMI Out...

Страница 119: ... the optical receiver install a 14dB attenuator pad into the optical interface board just above the optical receiver 4 module Repeat this process to obtain the desired output levels for all remaining output ports Go to step 14 12 If the node s output RF ports are to be driven at different levels and the node is not set up in 4 way forward segmentation the port with the highest output level should ...

Страница 120: ...nt 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 ...

Страница 121: ...ule Nominal level is 17 dBmV per channel Install the appropriate value input pad at the REV PORT IN PAD location to attenuate the signal to the desired level for the reverse path of the node 3 With the input to the node port set to 17 dBmV per channel a 4 dB transmitter input attenuator pad should be installed on the optical interface board just above the transmitter module to achieve 13 dBmV leve...

Страница 122: ...at the optical test point and record the value 7 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 ...

Страница 123: ...nfiguration module Install Receivers in Positions one receiver four outputs 1x4 Forward 1 one receiver four outputs with external RF source 1x4 Forward with Forward RF Injection plus FLI module 1 two receivers four outputs redundant 1x4 Redundant Forward plus SM LCM 1 2 two receivers four outputs redundant with external RF source 1x4 Redundant Forward with Forward RF Injection plus SM LCM and FLI ...

Страница 124: ...itions four receivers each feeding separate outputs 4x4 Forward 1 2 3 4 1x4 Forward Configuration Modules A single forward receiver RCVR 1 feeds all RF output ports Install the receiver in RCVR 1 4 way forward segmentable node The following diagram illustrates forward path signal flow in this configuration module ...

Страница 125: ...he 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 Install the receiver in RCVR 1 Install the FLI Module in the RCVR 4 position 4 way forward segmentable node The following diagram illustrates forward path signal flow in this configuration module ...

Страница 126: ...cally switches from primary receiver to redundant receiver when it senses a loss of optical input to the primary receiver Once optical input is restored the system automatically switches back to the primary receiver Install the primary receiver in RCVR 1 and the redundant receiver in RCVR 2 4 way forward segmentable node The following diagram illustrates forward path signal flow in this configurat...

Страница 127: ...le automatically switches from primary receiver to redundant receiver when it senses a loss of optical input to the primary receiver Once optical input is restored the system automatically switches back to the primary receiver Install the primary receiver in RCVR 1 and the redundant receiver in RCVR 2 Install the FLI module in the RCVR 4 position When using this module remove the 0 5dB forward int...

Страница 128: ...CVR 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 Install the second primary receiver in RCVR 3 4 way forward segmentable node The following diagram illustrates forward path signal flow in this configuration module ...

Страница 129: ... feeds the left side of the amplifier Ports 1 and 2 3 The Status Monitor Local Control Module switches between primary and redundant receivers upon loss of optical input to a primary receiver and switches back to the paired primary when optical input is restored Install the first set of receivers as follows first primary receiver RCVR 1 first redundant receiver RCVR 2 Install the second set of rec...

Страница 130: ...ee 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 ...

Страница 131: ... 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 ...

Страница 132: ...ur 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 ...

Страница 133: ...everse Injection 1 four inputs all feeding two transmitters redundant 4x1 Redundant Reverse 1 2 four inputs each pair of inputs feeding a transmitter 2 way segmented optional external RF source 4x2 Reverse with Auxiliary Reverse Injection 1 3 four inputs two feeding separate transmitters two feeding a single transmitter optional external RF source 4x3 Reverse with Auxiliary Reverse Injection left ...

Страница 134: ... 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 Install the transmitter module in XMTR 1 The following diagram illustrates reverse path signal flow in this configuration module ...

Страница 135: ...ation 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 ...

Страница 136: ...Ports 4 and 5 6 are combined and routed to a different reverse transmitter XMTR 3 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 Install the transmitter that is dedicated to Ports 1 and 2 3 in XMTR 1 Install the transmitter that is dedicated to Ports 4 and 5 6 in XMTR 3 The following diagram illustra...

Страница 137: ...R 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 Install the transmitters that are dedicated to Ports 1 and 2 3 in XMTR 1 and XMTR 2 Install the transmitters that are dedicated to Ports 4 and 5 6 in XMTR 3 and XMTR 4 The following diagram illustrates reverse path signal flow in this con...

Страница 138: ... are routed to XMTR 1 Signals from Ports 2 3 are routed to XMTR 2 An RF signal from an external source can optionally be injected at Ports 3 6 and coupled with the reverse RF input from Port 1 and routed to XMTR 1 Install modules as follows Transmitter dedicated to Port 1 in XMTR 1 Transmitter dedicated to Port 2 3 in XMTR 2 Transmitter dedicated to Port 4 5 6 in XMTR 4 The following diagram illus...

Страница 139: ...e routed to XMTR 3 Signals from Ports 5 6 are routed to XMTR 4 An RF signal from an external source can optionally be injected at Ports 3 6 and coupled with the reverse RF inputs from Ports 2 3 and 1 and routed to XMTR 1 Install modules as follows Transmitter dedicated to Ports 1 2 3 in XMTR 1 Transmitter dedicated to Port 4 in XMTR 3 Transmitter dedicated to Port 5 6 in XMTR 4 The following diagr...

Страница 140: ...ypically used when using multiplexing digital reverse modules such as our EDR Digital Reverse Modules Since the digital reverse module occupies the physical space that transmitters 3 and 4 used to occupy in the node lid only a 6 port optical interface board can be used Install modules as follows Transmitter dedicated to Port 1 in XMTR 1 Transmitter dedicated to Port 2 3 in XMTR 2 Transmitter dedic...

Страница 141: ...bes maintenance procedures for the 1 2 GHz GS7000 Node 5 Chapter 5 Maintenance In This Chapter Opening and Closing the Housing 122 Preventative Maintenance 124 Removing and Replacing Modules 127 Care and Cleaning of Optical Connectors 134 ...

Страница 142: ...gs 4 Replace any gaskets showing signs of wear cracked twisted pinched or dry with new silicon lubricated gaskets Closing the Housing Close the housing as follows 1 Ensure any worn gaskets are replaced and the gaskets are clean and in the correct position 2 Carefully close the lid CAUTION Use caution when closing housing Improper closing may result in the unit not being sealed from the environment...

Страница 143: ...Opening and Closing the Housing 123 ...

Страница 144: ...nually Connectors Semiannually Indicators Semiannually Wiring Cable Assemblies Annually Cleaning External Surfaces Annually External Controls Connectors Annually Internal Connectors Circuit Cards Annually Visual Inspection Visually inspect the following items What to Inspect How to Inspect Exterior surfaces Inspect for dust dirt lubricants or other foreign matter worn spots or deep scratches on su...

Страница 145: ...quipment at least annually Consumable Materials Use the materials listed below or equivalent when cleaning the equipment Item Specification Isopropyl alcohol TT I 735 Cheesecloth CC C 440 Spray type contact cleaner none Procedure Clean the equipment as described below 1 Use a small paintbrush to brush dust from connectors 2 Wipe surfaces dry with clean dry cheesecloth 3 Clean exterior surfaces wit...

Страница 146: ...disorder or death CAUTION Do not use cleaning fluids containing trichloroethylene trichloroethane acetone or petroleum based cleaners on equipment Failure to comply with this caution could harm equipment surfaces 4 Clean electrical contacts with spray type contact cleaner 5 Clean internal connectors and circuit boards with hand controlled dry air jet Do not use pressure exceeding 15 lb in2 1 05 kg...

Страница 147: ...pply modules RF amplifier assembly CAUTION Removing power from the 1 2 GHz GS7000 Node will interrupt customer service Removing any module except for the status monitor local control module will interrupt customer service unless that module has a redundant backup Module Replacement Procedure Follow this procedure to remove and replace an optical receiver optical transmitter optical amplifier optic...

Страница 148: ...press the Auto Set Up button on the cover of the LCM before you close the node housing This allows the LCM to check for and detect installed modules If the modules are not detected during this discovery process they cannot be monitored and controlled by the LCM The node must be powered and the modules operating properly in order to be detected 9 Perform the setup procedure in Chapter 4 to verify n...

Страница 149: ... 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 The following illustrations show how to assemble the pin adaptor to the module CAUTION To prevent electrostatic damage to electronic equipment take ESD precautions including the use of an ESD wrist strap ...

Страница 150: ...module fiber spool and connector 1 Pull up on the two module cover knurled tabs Use a slight rocking motion Note If the module is out of the housing it is easier to hold the module in both hands and push up on the two module cover knurled tabs with your thumbs You can also insert a flat blade screwdriver into the cover release tab slot on the right side of the module housing to assist with opening...

Страница 151: ...cover To remove these modules pull up carefully on their integrated handles until they separate from the RF amplifier assembly RFAmplifierAssembly Replacement Procedure Follow this procedure to remove and replace the RF amplifier assembly 1 Open the housing See Opening and Closing the Housing on page 122 2 Remove the AC power shunts and make a note of their location for reinstallation in the repla...

Страница 152: ...sert 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 Important Be careful not to damage the housing with the screwdriver 5 Grasp the two metal handles on the RF amplifier assembly and carefully lift the RF assembly out of the housing ...

Страница 153: ...ier assembly to the housing with the seven cross head shoulder screws Important Tighten the screws in order by number 1 through 7 Repeat the sequence twice ending with a torque of 18 to 20 in lbs 2 0 to 2 25 Nm 8 Reinstall the AC power shunts in their proper locations on the RF amp assembly 9 Close the housing See Opening and Closing the Housing on page 122 10 Perform the setup procedure in Chapte...

Страница 154: ... all residues Inspect connectors after cleaning to confirm that they are clean and undamaged Recommended Equipment CLETOP or OPTIPOP ferrule cleaner CLETOP Type A for SC Type B for LC Compressed air also called canned air Lint free wipes moistened with optical grade 99 isopropyl alcohol Bulkhead swabs for LC or SC type connectors choose appropriate type Optical connector scope Tips for Optimal Fib...

Страница 155: ...e laser safety requirements Connector cleanliness is crucially important for optimum results in fiber optic communications links Even the smallest amount of foreign material can make it impossible to obtain the expected insertion and return losses This can reduce the range of the equipment shorten its expected service life and possibly prevent the link from initializing at all New equipment is sup...

Страница 156: ...cleaning is needed a Use 99 isopropyl alcohol and a lint free wipe to clean the connector b Use the appropriate ferrule cleaner again to remove any film left over from the alcohol c Inspect the connector again through the scope and confirm that it is clean 4 If necessary repeat steps 3a 3c until the connector is clean Cleaning Bulkheads Note It is generally more difficult to clean bulkhead connect...

Страница 157: ...ith a fiber connector scope again to confirm that there is no dirt or alcohol residue on the optical surface e If any alcohol residue remains clean it off with a new dry bulkhead swab 4 Mate all connectors to bulkheads and proceed to Verifying Equipment Operation below 5 It is also recommended that all connectors be visually inspected after cleaning to verify the connector is clean and undamaged V...

Страница 158: ......

Страница 159: ...0 Node see Removing and Replacing Modules on page 127 6 Chapter 6 Troubleshooting In This Chapter No RF Output at Receiver RF Test Point Optical Power LED on Receiver Module is off 140 No RF Output Fiber Optic Light Level is Good Receiver Optical Power LED is on 142 Poor C N Performance 144 Poor Distortion Performance 146 Poor Frequency Response 148 No RF Output from Reverse Receiver 150 ...

Страница 160: ... 6 Troubleshooting 140 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 ...

Страница 161: ...hich is equal to 10 dBm The optimum light level input is 6 to 2 dBm For every 1 dBm change in optical input power the RF output will change by 2 dB Excessively high light input levels 2 dBm will cause distortions and or damage the photo diode The receiver will not function below this DC level which is equal to 10 dBm The optimum light level input is 10 to 2 dBm For every 1 dBm change in optical in...

Страница 162: ...ter 6 Troubleshooting 142 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 ...

Страница 163: ...than 14 dBm 2 The recommended RF output level at the output of the receiver module is 27 dBmV 7 0 dBmV as measured at the 20 dB RF test point This setup is recommended to achieve the best possible performance The recommended RF output level at the output of the receiver module is 27 dBmV 7 0 dBmV as measured at the 20 dB RF test point This setup is recommended to achieve the best possible performa...

Страница 164: ...Chapter 6 Troubleshooting 144 Poor C N Performance Troubleshooting Flowchart Follow this troubleshooting flowchart Also see the notes following the chart ...

Страница 165: ...er Attenuate the light to simulate the amount of light that should be at the 1 2 GHz GS7000 Node and rerun the C N performance Add components into the path one at a time until the problem is found Change jumpers couplers fibers and connectors one at a time taking C N measurements after each change A phenomenon called shot noise will occur if the light level is too high into the receiver This is no...

Страница 166: ...Chapter 6 Troubleshooting 146 Poor Distortion Performance Troubleshooting Flowchart Follow this troubleshooting flowchart Also see the notes following the chart ...

Страница 167: ...rtion performance The range for optical light input level is 10 to 2 dBm which converts to 0 1 to 0 6 V DC The optimum operating range is 6 dBm to 2 dBm which converts to 0 25 to 0 6 V DC Levels higher than 2 dBm can cause the photo diode to generate distortions which add to the distortion performance of the link effectively degrading the distortion performance 3 Attenuate the light to simulate th...

Страница 168: ...Chapter 6 Troubleshooting 148 Poor Frequency Response Troubleshooting Flowchart Follow this troubleshooting flowchart Also see the notes following the chart ...

Страница 169: ...e frequency response for the transmitter is dependent on the transmitter manufacturer s specification 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 2 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 ga...

Страница 170: ...Chapter 6 Troubleshooting 150 No RF Output from Reverse Receiver Troubleshooting Flowchart Follow this troubleshooting flowchart ...

Страница 171: ...ons 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 Check your extranet site often as the information is updated frequently 7 Chapter 7 Customer Support Information ...

Страница 172: ......

Страница 173: ...tter Appendix A Technical Information Introduction This appendix contains tilt forward and reverse equalizer charts and pad values and part numbers In This Appendix Linear Tilt Chart 154 Forward Equalizer Chart 156 ...

Страница 174: ...hnical Information 154 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 ...

Страница 175: ...he 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 This was found by taking the difference in tilt between 1 GHz and 750 MHz 14 5 10 6 3 9 dB Then subtract the difference in tilt from the operating level 49 0 3 9 45 1 dBmV ...

Страница 176: ...lizer loss EQ Value Insertion Loss at MHz Total Tilt dB 1218 1000 52 1218 MHz 1 5 1 0 1 3 1 5 3 0 1 0 1 6 3 0 4 5 1 0 1 8 4 5 6 0 1 0 2 1 6 0 7 5 1 0 2 4 7 5 9 0 1 0 2 6 9 0 10 5 1 0 2 9 10 5 12 0 1 0 3 2 12 0 13 5 1 0 3 5 13 5 15 0 1 0 3 7 15 0 16 5 1 0 4 0 16 5 18 0 1 0 4 3 18 0 19 5 1 2 4 8 19 5 21 0 1 2 5 0 21 0 22 5 1 2 5 3 22 5 24 0 1 2 5 6 24 0 ...

Страница 177: ... 4 5 5 4 5 6 0 1 0 1 8 2 6 3 2 3 5 3 8 6 8 6 9 7 0 6 0 7 5 1 0 2 0 3 0 3 8 4 2 4 6 8 2 8 4 8 5 7 5 9 0 1 0 2 2 3 4 4 3 4 8 5 3 9 7 9 8 10 0 9 0 10 5 1 0 2 4 3 8 4 9 5 4 6 0 11 1 11 3 11 5 10 5 12 0 1 0 2 6 4 2 5 4 6 1 6 7 12 6 12 8 13 0 12 0 13 5 1 0 2 9 4 6 6 0 6 7 7 4 14 0 14 2 14 5 13 5 15 0 1 0 3 1 5 0 6 5 7 3 8 1 15 5 15 7 16 0 15 0 16 5 1 0 3 3 5 4 7 1 8 0 8 9 16 9 17 2 17 5 16 5 18 0 1 5 4 ...

Страница 178: ...Cisco EDR 85 System includes EDR Transmitter modules that install in GainMaker and GS7000 Nodes and companion Cisco Prisma high density HD EDR PRX85 Receiver modules that install in a Prisma II or Prisma II XD chassis at the headend or hub The transmitter and receiver use Small Form Factor Pluggable SFP optical pluggable modules OPMs for enhanced flexibility The Cisco EDR 85 System operates over t...

Страница 179: ...need for optical amplifiers reducing cost and space requirements Capable of sending 80 individual 5 85 MHz reverse signals over a single fiber Compatible with Cisco s 40 wavelength DWDM system Enables independent balancing of reverse traffic at EDR receiver RF ports Simplified setup reduces installation time and expertise requirements Distance and temperature independent link performance simplifie...

Страница 180: ...e 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 6 port OIB as shown ...

Страница 181: ...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 Important This configuration requires a 4x2 Reverse Configuration Module for 6 port OIB as shown ...

Страница 182: ...lustration 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 Important This configuration requires a 4x4 Reverse Configuration Module as ...

Страница 183: ...w 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 Important This configuration requires a 4x4 Reverse Configuration Module as shown ...

Страница 184: ...plexing Applications 164 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 ...

Страница 185: ...Enhanced Digital Return System Overview 165 The following is a block diagram of the EDR Enhanced Digital Return 2 1 Multiplexing System ...

Страница 186: ...crete 5 to 85 MHz RF signal while the EDR 2 1 transmitter introduces two RF inputs to produce two discrete 5 to 85 MHz RF signals The transmitter module also converts each signal to a baseband digital data stream and time division multiplexes the two streams into a single data stream The data stream is carried optically over fiber via an SFP type OPM module to a remote hub or headend location wher...

Страница 187: ...r Node parameters 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 and it uses the single wide module housing As such it occupies one ...

Страница 188: ...DR 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 As such it occupies two standard transmitter positions in the node lid The following ill...

Страница 189: ...Enhanced Digital Return System Overview 169 For EDR 1 1 Transmitter Module Note This example shows four transmitter modules installed in the node which requires a 4x4 Reverse Configuration Module ...

Страница 190: ...x B Enhanced Digital Return Multiplexing Applications 170 For EDR 2 1 Transmitter Module Note This example shows two transmitter modules installed in the node which requires a 4x4 Reverse Configuration Module ...

Страница 191: ...ally stacked in an associated Prisma II Host Module that occupies a single wide slot in the Prisma II standard chassis Up to 26 HD modules can operate in a standard 6 rack unit 6RU chassis the 56 connector version of the chassis is required to make use of both receivers in one chassis slot Up to 16 HD modules can operate in the Prisma II XD chassis The ability to mix EDR Receiver modules with othe...

Страница 192: ...Appendix B Enhanced Digital Return Multiplexing Applications 172 Receiver Module Diagram The following illustration shows the receiver module ...

Страница 193: ...ry Single 1 1 on Secondary Single 1 1 on Primary Single 2 1 on Secondary Legacy Single 2 1 Legacy Dual 2 1 Each of these operating modes is described below Single 2 1 Mode Referring to the diagram below the EDR transmitter digitizes and combines two RF signals RF 1 RF 2 into one serial stream and transmits is over optical fiber to the receiver At the receiver the serial stream is de serialized con...

Страница 194: ... is sent separately to the two RF connectors on the back of the module Dual 2 1 Mode Referring to the diagram below two EDR transmitters are connected to one receiver Each 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 At the receiver the serial streams from the two separate transmitters are deserialized an...

Страница 195: ...ansmitter digitizes a single RF signal RF 1 At the receiver the serial streams from two separate transmitters are deserialized and converted back to their two analog RF components The combined Transmitter 1 signal RF 1 RF 2 is sent to RF port A and the Transmitter 2 signal RF 1 is sent to RF port B on the back of the module Single 1 1 on Primary Single 2 1 on Secondary This mode is identical to th...

Страница 196: ...routed out through the receiver s RF output using its installed OPM module Item Description 1 Dust Plug 2 Bale Clasp Open Push upward to close 3 Transmit Bore Not In Use for the Receiver 4 Receive Bore Not In Use for the Transmitter About the EDR LCM The EDR Local Control Module is required for in band status monitoring the node signaling and data transmission The packet cable is delivered with th...

Страница 197: ... inch hex driver or ratchet Two adjustable wrenches for coaxial connectors Standard flat head or phillips head screwdriver Torque wrench capable of settings up to 100 in lb 11 3 Nm Operating Environment Before operating the node with the EDR installed ensure that the operating environment meets the following standards Ambient temperature range outside the node must be maintained between 40 C and 6...

Страница 198: ...le and connect the fiber jumper to the installed OPM module before installing the EDR transmitter To Install the OPM Module in the EDR Transmitter CAUTION The OPM modules are electro static sensitive devices Always use an ESD wrist strap or similar individual grounding device when handling OPM modules or coming in contact with modules 1 Connect the blue LC connector to the transmit bore of the OPM...

Страница 199: ...ing 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 ...

Страница 200: ...uted carefully in the fiber tray and aligned under the fiber jumper clip one by one The following diagram shows the fiber jumper connection for 1 1 transmitter The following diagram shows the fiber jumper connection for 2 1 transmitter Note 1 When removing faulty OPM module press and remove the blue LC connecter before you can open the bale clasp 2 OPM modules should be installed before installing...

Страница 201: ... the RCM Section on page 40 for details Two or three transmitter modules install the modules in transmitter positions XMTR 1 XMTR 2 or XMTR 1 XMTR 2 XMTR 3 AND install an appropriate Reverse Configuration Module in the RF amplifier assembly Refer to the RCM Section on page 40 for details four transmitter modules install the modules in transmitter positions XMTR 1 XMTR 2 XMTR 3 XMTR 4 AND install a...

Страница 202: ...er positions XMTR 1 XMTR 2 and XMTR 3 XMTR 4 AND 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 For EDR 1 1 Transmitter Module For EDR 2 1 Transmitter Module ...

Страница 203: ...c end head to the receive bore of the OPM module installed on the Receiver of the Prisma II platform 4 The receiver OPM module requires LC connector conversion maybe needed 5 Clean the LC connector s fiber optic end faces See the following Tip for a pointer to a fiber optic inspection and cleaning white paper http www cisco com en US tech tk482 tk876 technologies_white_paper09186a 0080254eba shtml...

Страница 204: ...nsmitter module is installed 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 not available for GS7000 Node ...

Страница 205: ...ver Module The following diagram shows the OPM module installed on the receiver module of the Prisma II To Configure the Receiver Mode The receiver mode can be configured in the Web UI interface though connection with the Prisma II platform For complete configuration steps and setup precautions refer to the Cisco Prisma II EDR Receiver Installation Guide part number OL 29646 and the Cisco Prisma I...

Страница 206: ...e 40 for details The maximum configuration of two 2 1 transmitter modules in transmitter positions XMTR 1 XMTR 2 and XMTR 3 XMTR 4 an appropriate Reverse Configuration Module Refer to the RCM Section on page 40 for details The maximum configuration of four 1 1 transmitter modules in transmitter positions XMTR 1 XMTR 2 and XMTR 3 XMTR 4 an appropriate Reverse Configuration Module Refer to the RCM S...

Страница 207: ...OPM Module Port Input Overdrive OFF OFF Green Green Cisco Standard OPM Module No Green Orange Solid Non Cisco Standard OPM Module No Green Orange Blink Cisco Standard OPM Module Non Cisco Standard OPM Module Yes For EDR 2 1 transmitter module The following table lists the LED status and the indicated OPM and the overdrive status of both RF port 1 and RF port 2 LED Indication Power PWR Laser LSR OP...

Страница 208: ...Appendix B Enhanced Digital Return Multiplexing Applications 188 Orange Blink Orange Solid Non Cisco Standard OPM Module Yes No Orange Blink Orange Blink Cisco Standard OPM Module Yes Yes ...

Страница 209: ...inations that enable proper balancing of the reverse path Regardless of the type of equipment used the balancing process is fundamentally the same A reverse RF test signal or signals of known amplitude is injected into the RF path at the RF input of the node The reverse transmitter converts the RF test signal s to an optical signal and transmits it to the headend or hub site via fiber optic cable ...

Страница 210: ...his type of system is becoming increasingly popular due to its ease of use In this case the sweep system includes a combination reverse sweep receiver and forward data transmitter which is located in the headend hub The frequency response characteristics of the received sweep signal including relative amplitude and tilt are converted by the headend sweep receiver to a data format and transmitted i...

Страница 211: ...setting Example Reverse input 15 dBmV Insertion loss 20 dB Result Signal generator setting 15 dBmV 20 dB 35 dBmV 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 digit...

Страница 212: ...iber optic connectors Cisco 99 alcohol and lint free wipes to clean fiber connectors Optical power meter to measure light levels Proper fiber connector for optical power meter to make optical connections Digital voltmeter to measure voltages Spectrum analyzer or a field strength meter to measure RF levels Cisco test probe part number 501111 to access test points Cisco external test probe part numb...

Страница 213: ... the power supply of the node with the transmitter installed 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 Solid Non Cisco Standard OPM Module is installed No need for troubleshooting Cisco Standard OPM Module is highly recommended for better...

Страница 214: ...formance and stability See the data sheet of the node for ordering information Green Orange Blink Input Level Overdrive Verify the input level of RF port 2 The output level overdrive indicates the output signal level exceeds the limit of 35 dBmV Orange Blink Green Non Cisco Standard OPM Module is in use Verify the input level of RF port 1 The output level overdrive indicates the output signal leve...

Страница 215: ...t level overdrive indicates the output signal level exceeds the limit of 35 dBmV 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 ordering information ...

Страница 216: ...ulty Contact the Cisco Technical Service Center for assistance Automatic power control circuit failure Contact the Cisco Technical Service Center for assistance Damaged fiber Contact the Cisco Technical Service Center for assistance Symptom Possible Cause Possible Solutions No optical signal output cont d One or more power supply voltages are out of specification Check the power supply for proper ...

Страница 217: ...uction This appendix explains the installation and configuration of the GS7000 Node expanded fiber tray In This Appendix Expanded Fiber Tray Overview 198 Expanded Fiber Tray Installation 200 Fiber Management System 203 Configuration Examples 209 ...

Страница 218: ... passive devices such as CWDM and OADM cassettes and raw WDM cartridges Features The expanded fiber tray provides the following features Design allows for configuration flexibility Built in fiber guides and tabs aid management of slack fiber and maintenance of minimum bend radiuses Accommodates most commercially available optical passive devices Circular indexed slot pattern in tray base allows fl...

Страница 219: ...Expanded Fiber Tray Overview 199 Tray Components The following illustration shows the unassembled expanded fiber tray components ...

Страница 220: ...ep 3 2 Remove any installed fibers from the existing standard fiber tray and then remove the fiber tray from the node by pulling up on the fiber tray assembly as shown in the following illustration 3 Make sure that the expanded fiber tray clear cover is secured in place on the fiber tray Note Push down on the cover at the cover locking tabs around the periphery of the fiber tray to secure the cove...

Страница 221: ...ack 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 5 Push down on the fiber tray housing until the fiber tray snaps into place and is fully inserted into the node as shown in the following illustration ...

Страница 222: ... C Expanded Fiber Tray 202 6 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 ...

Страница 223: ...s Several features are incorporated into the tray to provide fiber protection and aid in maintaining the proper bend radius of the fiber A sheet of blank stick on labels is also included for use in identifying the installed components and configuration Quality fiber management focuses on four key areas as follows Maintaining fiber bend radius Proper fiber routing Connectors and bulkhead access Fib...

Страница 224: ...rforming fiber tracing testing and reconfiguration When fiber is not managed slack fiber tends to become entangled making tracing and rearrangement difficult The expanded fiber tray provides fiber guides to contain slack fiber Slack fiber can be coiled in a circular fashion using the guides on the left side of the tray or by routing through the guides on the outer edge of the tray The FIBER guides...

Страница 225: ...r beyond its capabilities The expanded fiber tray comes with a clear protective cover After fibers have been properly routed in the tray the cover should be closed and locked in position with the locking tabs before stowing the tray in the node Always route fibers in the tray using the fiber guides located about the tray periphery This will retain the fiber within the tray and prevent inadvertent ...

Страница 226: ...lustrations 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 ...

Страница 227: ...Fiber Management System 207 CWDM Clip The following illustration shows a CWDM clip Cassette Device Clip The following illustration shows a cassette device clip holding a demultiplexer ...

Страница 228: ...Appendix C Expanded Fiber Tray 208 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 ...

Страница 229: ...ral optical module options to help you combine 3x3 and 4x4 forward and return segments utilizing coarse wave division multiplexing CWDM dense wave division multiplexing DWDM and available analog or digital laser options With the use of four 1310 nm 1550 nm WDMs or four 1310 nm CWDMs installed in the node s expanded fiber tray the 1310 nm forward path signals can be combined with the DWDM or CWDM r...

Страница 230: ...tiple wavelengths in the 1320 nm to 1335 nm window down a single fiber using wavelength division multiplexing WDM with each transmitter carrying a full RF load The multi wavelength solution is ideal for segmentation of node service areas because they enable the reuse of existing fiber up to six times over distances of up to 30 kilometers GS7000 Node Headend Rtrn RX Fwd TX Rtrn TX Fwd RX WDMs WDMs ...

Страница 231: ...sing 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 Note This solution requires an O Band multiplexer at the headend as shown in the following illustration ...

Страница 232: ...Appendix C Expanded Fiber Tray 212 ...

Страница 233: ...C automatic gain control A process or means by which gain is automatically adjusted in a specified manner as a function of input level or other specified parameters AMPL amplitude amplifier cascade two or more amplifiers in a series the output of one feeding the input of another attenuation The difference between transmitted and received signal strength due to loss through equipment lines or other...

Страница 234: ...um lobe of an antenna BIOS basic input output system blanking level The amplitude of the front and back porches of the composite video signal The blanking level separates the range containing picture information from the range containing synchronization information BNC A coaxial connector that uses two bayonet lugs on the side of the female connector BNC stands for Bayonet Neill Concelman and is n...

Страница 235: ...respect to the change of gain at another level for the same signal Also the elimination of redundant information from an audio data or video signal to reduce transmission requirements CW continuous wave CWDM coarse wave division multiplexing CWDM allows a modest number of channels typically eight or less to be stacked in the 1550 nm region of the fiber called the C Band This capacity is greater th...

Страница 236: ...ncy in an FM system differential gain The difference in amplification of a signal superimposed on a carrier between two different levels of carrier diplex filter A filter which divides the frequency spectrum into a high frequency segment and a low frequency segment so that two different signals can be sent down the same transmission path distribution The activities associated with the movement of ...

Страница 237: ... 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 E EC European Community EEPROM electrically erasable programmable read only memory EMC electromagnetic compatibility A measure of equipment tolerance to external electromagnetic fields emission designer An FCC or CCIR code that defines ...

Страница 238: ...n electric field arising from a voltage applied between the gate and source electrodes FM frequency modulation A transmission technique in which the frequency of the carrier varies in accordance with the modulating signal frequency The number of similar shapes in a communications or electrical path in a unit of time For example the number of sine waves moving past a fixed point in a second frequen...

Страница 239: ...e broadband output stream is transmitted as an optical signal over the high speed fiber optic transmission lines to local service areas where it is split converted to electrical RF signals and distributed to set tops over coaxial cable I I O input output IC integrated circuit IEC International Electro technical Commission IF intermediate frequency The common frequency which is mixed with the frequ...

Страница 240: ...the application of one Newton of force on a lever at a point on the lever that is one meter from the pivot point 1 Nm 0 737561 ft lb O OIB optical interface board P PCB printed circuit board PROM programmable read only memory A memory chip on which data can be written only once Once data has been written onto a PROM it cannot be written to again PWB printed wiring board Q QAM quadrature amplitude ...

Страница 241: ...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 RFI radio frequency interference RMA return material authorization A form used to return products RX receive or receiver S S N or SNR signal to noise ratio The ratio in decibels of the maximum peak to peak voltage of the video signal...

Страница 242: ...vices 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 T torque A force that produces rotation or torsion Usually expressed in lb ft pound feet or N m Newton meters The application of one pound of force on a lever at a point on the lev...

Страница 243: ...Glossary 223 W W 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 ...

Страница 244: ......

Страница 245: ...ward Configuration Modules 109 2x2 and 2x4 Redundant Forward Configuration Modules Description 31 3 3x4 1 2 4 Forward Configuration Module 111 3x4 1 2 4 Forward Configuration Module Description 32 3x4 1 3 4 Forward Configuration Module 110 3x4 1 3 4 Forward Configuration Module Description 32 4 4 Way Forward Path Signal Routing 21 4 Way Forward Segmentable Node RF Assembly 95 4x1 Redundant Reverse...

Страница 246: ...h Auxiliary Reverse RF Injection Description 37 A A 213 ac AC 213 AC RF 213 Accessing the Receiver Transmitter Module Fiber Spool and Connector 130 AFC 213 AGC 213 AMPL 213 amplifier cascade 213 Amplifier Output Linear Tilt Chart for 1 GHz 155 Applying Power to the Node 85 attenuation 213 attenuator 213 AUX 214 B baseband 214 baud Bd 214 beamwidth 214 Before You Begin 177 BIOS 214 blanking level 2...

Страница 247: ...r Module 166 EDR Transmitter Status Indicators 187 EEPROM 217 EMC 217 emission designer 217 Enhanced Digital Return EDR System Installation 177 Enhanced Digital Reverse System Overview 159 EPROM 217 EQ 217 equalization 218 equipment description 2 features 6 Equipment 192 Equipment Description 2 ERP 218 ESD 218 Expanded Fiber Tray Installation 200 Expanded Fiber Tray Overview 198 F FCM 218 Features...

Страница 248: ...gnal Director Replacement Procedure 131 frequency 218 frequency agile 218 frequency response 218 ft lb 218 Full Configuration 162 Functional Description 4 Functional Diagram Hub Node 20 94 Functional Diagrams 24 4 Way Forward Segmentable Node 17 91 G gain 219 General Information 1 H Hertz 219 HFC 219 housing opening and closing 122 pedestal or wall mounting 72 strand mounting 69 I I O 219 IC 219 I...

Страница 249: ...er LED on Receiver Module is Off 140 No RF Output from Reverse Receiver 150 node opening and closing 122 Node Fastener Torque Specifications 66 Node Housing Ports 68 Node Inputs Outputs Diagram 7 Node Power Limitations 63 Node Powering Procedure 85 Notes 141 143 145 147 149 O OIB 220 Opening and Closing the Housing 122 Opening the Housing 122 Operating Environment 177 Optical Amplifier EDFA Module...

Страница 250: ...r Distribution 23 power supply module 61 Power Supply Module 61 Power Supply Module Description 61 powering the node 85 Preventative Maintenance 124 Procedure 69 72 77 125 PROM 220 Proper Fiber Routing 204 PWB 220 Q QAM 220 QPSK 221 R RCM 221 RCVR 221 Receiver Operating Modes 173 Recommended Equipment 134 Reconfiguring Forward Signal Routing 103 Reconfiguring Reverse Signal Routing 113 Removing an...

Страница 251: ...erse path setup procedures 101 tools and test equipment 90 Setup and Operation 89 Setup Procedure 97 Single Transmitter Configuration 160 SM 222 SMC 222 SMIU 222 SNMP 222 status monitor 58 Status Monitor Description 58 Status Monitor Local Control Module 58 Strand Mounting the Node 69 synchronous transmission 222 System Block Diagram 164 System Diagrams 17 91 System Functional Diagrams 160 T Theor...

Страница 252: ...Index 232 troubleshooting flowcharts 139 TX 222 U UPS 222 uV 222 V V 222 Visual Inspection 124 Voltage Check Procedure 86 W W 223 WDM Configuration Example 209 ...

Страница 253: ......

Страница 254: ...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 2015 Cisco Systems Inc All rights reserved October 2015 Printed in United States of America First Published October 2015 ...

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