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Contents For Your Safety ......................... 3 Notices ............................4 Important Safety Instructions....................v Laser Safety ..........................xi Laser Warning Labels ......................xiii General Information Equipment Description ......................2 Theory of Operation System Diagrams ........................13 Forward Path .......................... 14 Reverse Path ........................... 15 Power Distribution ........................
Contents Opening and Closing the Housing ..................68 Preventative Maintenance ....................70 Removing and Replacing Modules ..................73 Care and Cleaning of Optical Connectors ................79 Troubleshooting No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off .............................
Important Safety Instructions Important Safety Instructions Read and Retain Instructions Carefully read all safety and operating instructions before operating this equipment, and retain them for future reference. Follow Instructions and Heed Warnings Follow all operating and use instructions. Pay attention to all warnings and cautions in the operating instructions, as well as those that are affixed to this equipment.
Important Safety Instructions or replacement. Only qualified service personnel are allowed to remove chassis covers and access any of the components inside the chassis. Equipment Placement WARNING: Avoid personal injury and damage to this equipment. An unstable mounting surface may cause this equipment to fall. To protect against equipment damage or injury to personnel, comply with the following: Install this equipment in a restricted access location (access restricted to service...
Important Safety Instructions Connection to Network Power Sources Refer to this equipment’s specific installation instructions in this manual or in companion manuals in this series for connection to network ferro-resonant AC power sources. AC Power Shunts AC power shunts may be provided with this equipment. Important: The power shunts (where provided) must be removed before installing modules into a powered housing.
Important Safety Instructions Wristwatch and Jewelry - For personal safety and to avoid damage of this equipment during service and repair, do not wear electrically conducting objects such as a wristwatch or jewelry. Lightning - Do not work on this equipment, or connect or disconnect cables, ...
Important Safety Instructions Do not expose batteries to temperatures above 100° C (212° F). Disposal The batteries may contain substances that could be harmful to the environment Recycle or dispose of batteries in accordance with the battery manufacturer’s ...
Important Safety Instructions EMC Compliance Statements Where this equipment is subject to USA FCC and/or Industry Canada rules, the following statements apply: FCC Statement for Class A Equipment This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.
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. ...
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.
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...
Laser Warning Labels Location of Labels on Equipment The following illustrations display the location of warning labels on this equipment.
Chapter 1 General Information Introduction This manual describes the installation and operation of the Cisco 1.2 GHz Super High Output (SHO) GS7000 Node. In This Chapter Equipment Description ................2...
The housing also has provisions for strand, pedestal, or wall mounting. Note: The 1.2 GHz SHO GS7000 node is painted white, and the pictures in this document which use unpainted housings are used as references.
Equipment Description The following illustration shows the external housing of the 1.2 GHz SHO GS7000 Node.
Diplex filter choices are 42/54 MHz, and 85/102 MHz. The forward path of the 1.2 GHz SHO GS7000 Node can be deployed with a...
EDR system. Reverse segmentation is configured by setting the reverse segmentation switch to the appropriate setting. The 1.2 GHz SHO GS7000 Node accepts Optical Transmitter Modules based on the existing 694x/GainMaker optical transmitters. Reverse optical transmitters can be installed to transmit data, video, or both.
The DC power supply modules can be fed by any housing base port (1 through 6). Modules Functional Descriptions This table briefly describes each module. The 1.2 GHz SHO GS7000 Node may not contain all these modules. See Theory of Operation (on page 11) for detailed descriptions of the modules.
The 1.2 GHz GS7000 power supply module has multiple output voltages of +24.5, +8.5, -6.0, and +5.5 V DC. A second power supply can be installed in the node for redundancy or load sharing. The 1.2 GHz GS7000 Node can be set up in the following powering configurations: ...
Chapter 1 General Information Module Description Optical Interface The Optical Interface Board (OIB) provides all interconnections Board between the modules in the housing lid to the RF amplifier module in the housing base. Each module in the lid plugs directly into the OIB through a connector header, a connector header and RF connectors, or row of sockets depending on the module type.
Equipment Description Ordering Information Please refer to the 1.2 GHz SHO GS7000 Node Data Sheet for a full listing of the configured node, components, and accessories that are available. Note: Please consult with your Account Representative, Customer Service Representative, or System Engineer to determine the best configuration PID for your particular application.
This chapter describes the theory of operation for the 1.2 GHz SHO GS7000 Node, including functional descriptions of each module in the node. The 1.2 GHz SHO GS7000 Node is comprised of two parts, the lid and the base. The lid houses an optical interface board (OIB), and some of the...
Chapter 2 Theory of Operation In This Chapter System Diagrams ......... Error! Bookmark not defined. Forward Path ........Error! Bookmark not defined. Reverse Path ......... Error! Bookmark not defined. Power Distribution ......Error! Bookmark not defined. ...
Forward path refers to signals received by the node from the hub or headend. These signals are amplified in the node and routed to subscribers through the cable distribution network. Forward Path Signal Routing 1.2 GHz SHO GS7000 Node forward path signal routing functions are described below. Stage Description 1310 nm or 1550 nm optical signals from the hub or headend are applied to the receiver module in the 1.2 GHz SHO GS7000 Node.
These signals are amplified in the node and returned to the headend optically through the fiber portion of the network. The reverse path is not used in all networks. Reverse Path Signal Routing 1.2 GHz SHO GS7000 Node reverse path signal routing functions are described below. Stage Description...
The power supply module(s) convert(s) the AC input to +24.5, +8.5, -6.0, and +5.5 V DC. The +24.5, +8.5, -6.0, and +5.5 V DC lines are routed to 1.2 GHz GS7000 Node internal modules. If two power supplies are installed and both are active, the load is shared equally between them.
RF Amplifier Module RF Amplifier Module Introduction This section describes the RF amplifier module. The RF amplifier module contains the forward band and the reverse band amplifiers. Functional Diagrams The following diagrams show how the RF amplifier functions.
The forward band linear equalizer modules set the overall forward path tilt of the RF amplifier module and the 1.2 GHz SHO GS7000 Node. The 1.2GHz SHO GS7000 Node launch amplifier is shipped with two 12.0 dB and one 10.5 dB linear equalizers installed in the RF amplifier module.
RF Amplifier Module paths comprised of an AC bypass circuit, a bi-directional 20 dB down reverse test point, a diplex filter, and an input pad. After the input pads, the reverse signals from ports 1 and 2 (left), and ports 4 and 5 (right) are each combined with separate 2-way combiners.
Optical Interface Board Description The Optical Interface Board (OIB) provides all interconnections between the modules in the housing lid of the 1.2 GHz SHO GS7000 Node. The modules in the housing lid include the optical receiver, optical transmitter, power supply, Remote-PHY module, and status monitoring/local control modules.
Optical Receiver Module Optical Receiver Module Optical Receiver Module Description The optical receiver module takes in optical signals and puts out forward band RF signals. The module cover has a sliding tray incorporated into it allowing the receivers fiber pigtail to be spooled up and contained within the receiver module. This greatly improves fiber management within the node.
Chapter 2 Theory of Operation There are two types of the receiver module: Standard Input Optical Receiver and Low Input Optical Receiver. The optical input range for the low input receiver is 0.1 w to 0.63 w (-10 dBm to -2 dBm).
22.5 -8dBm Optical 22.0 Input Power 21.5 21.0 2.25% 2.50% 2.75% 3.00% 3.25% 3.50% 3.75% 4.00% Transmitter OMI per Channel 1310nm 1550nm For the detailed information about the low input optical receiver, please refer to the latest GS7000 Data Sheet.
Chapter 2 Theory of Operation Optical Receiver Module Diagram The following diagram shows how the optical receiver module functions.
Optical Analog Transmitter Module Descriptions The optical analog transmitter module takes in reverse band RF signals and puts out optical signals. The 1.2 GHz GS7000 Node is designed to work specifically with the existing mid gain, temperature compensated DFB optical transmitters. Other mid and high gain optical transmitters may be installed in the 1.2 GHz GS7000 Node...
Chapter 2 Theory of Operation Optical Analog Transmitter Module Diagram This illustration shows how the optical analog transmitter module functions.
A local control module and a status monitor are available for the 1.2 GHz SHO GS7000 Node and Hub Node. A status monitor consists of a local control module with a transponder core module installed in the housing. The same housing is used for both units.
Chapter 2 Theory of Operation Note: The transponder core module can be seen through the Heart Beat/Receive/Error indicator cutout in the cover. Local Control Module Description The local control module locally monitors the following node voltages and signals: Receiver optical input level ...
6 dB (wink) attenuators, the reverse band on/off switches, the optical switch, and optical amplifiers through the PC-based GS7000 ViewPort software. All parameters monitored by the local control module can be displayed and reviewed using...
Chapter 2 Theory of Operation Power Supply Module Power Supply Module Description The power supply module converts a quasi-square wave, 50 – 60 Hz AC input voltage into four well-regulated DC output voltages. The supply is an off-line, switched-mode power supply with a large operative input range. This reduces service outages by converting long duration AC surges into load power.
The power supply module plugs directly into the optical interface board, no external cables are required. A 1.2 GHz SHO GS7000 Node can be configured with one or two power supplies. AC input voltage can be routed to both power supplies commonly from any node output port.
Chapter 2 Theory of Operation Node Power Limitations Nodes and hub nodes must be configured in a manner that prevents potential thermal overloads. Heat generated by the node can reduce the life of the equipment. CAUTION: The life of the equipment may be reduced if configured to draw more than the recommended level of power from the power supplies.
Chapter 3 Installation Introduction This chapter describes the installation of the 1.2GHz GS7000 Node. In This Chapter Tools and Test Equipment ....Error! Bookmark not defined. Node Housing Ports ......Error! Bookmark not defined. Strand Mounting the Node ....Error! Bookmark not defined.
Chapter 3 Installation Tools and Test Equipment Required Tools and Test Equipment The following tools and equipment are required for installation. Torque wrench capable of 5 to 12 ft-lbs (6.8 to 16.3 Nm) 4-inch to 6-inch extension for torque wrench ...
Tools and Test Equipment Fastener Torque Specification Illustration RF Amplifier assembly shoulder 18 to 20 in-lbs screws (cross head screw) (2.0 to 2.3 Nm) Seizure nut 2 to 5 ft-lbs (2.7 to 6.8 Nm) RF cable connector Per manufacturer instructions Fiber optic cable connector 20 to 25 ft-lbs (27.1 to 33.9 Nm)
Node Housing Ports The following illustration shows the location of available RF ports, fiber ports, and test points on the 1.2 GHz GS7000 Node housing. Notes: When replacing test point port plugs, torque from 5 to 8 ft-lbs (6.8 to 10.8 Nm).
Strand Mounting the Node Strand Mounting the Node Description The following procedure explains how to install the 1.2 GHz GS7000 Node on a strand (aerial installation). Strand mounting allows street-side access to the housing. Procedure Follow this procedure to mount the housing to a strand. The housing does not need to be opened for strand installation.
Chapter 3 Installation Loosen the strand clamp bolts to separate the clamps enough to insert the strand, but do not remove them. Then lift the housing into proper position on the strand. Slip the clamps over the strand and finger-tighten the clamp bolts. This allows additional side-to-side movement of the housing as needed.
Strand Mounting the Node Note: If supplying power to the node through a main output port, a power inserter must be installed to inject the AC voltage onto the RF signal. Use a torque wrench and a 1/2-inch socket to tighten the strand clamp bolts from 5 ft-lb to 8 ft-lbs (6.8 to 10.8 Nm).
WARNING: Be aware of the size and weight of the node while mounting. A fully loaded 1.2 GHz GS7000 Node weighs over 50 lbs (22.7 kg). Ensure that proper handling/lifting techniques are employed when working in confined spaces with heavy equipment.
Pedestal or Wall Mounting the Node and set the bolts and strand clamps aside. Position the 1.2 GHz GS7000 Node horizontally in the enclosure and allow for free flow of air around it. Inadequate airflow could cause the node to exceed thermal parameters.
Chapter 3 Installation Fiber Optic Cable Installation Overview The 1.2 GHz GS7000 Node can accept a fiber optic cable connector from either the right or left side of the housing, or both. The fiber optic cable(s) carries forward and reverse optical signals.
Fiber Optic Cable Installation Fiber Management System The fiber management system is made up of a fiber tray and a fiber routing track. The fiber tray provides a convenient location to store excess fiber and up to two WDM modules in the node. The tray is hinged to allow it to move out of the way during the insertion of the fibers and for installation or replacement of the node power supplies.
Chapter 3 Installation Note: Power supplies are removed in the previous illustration for clarity.
Fiber Optic Cable Installation 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.
Chapter 3 Installation 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.
Fiber Optic Cable Installation Note: If using the alternate (right-side) fiber connection port, you have to route the fibers through the fiber channel in the fiber track located underneath the...
Chapter 3 Installation unused fiber holders. Hold the connector body to prevent rotation of the connector or fibers. Carefully thread the 5/8-inch threaded nut into the threaded hole of the fiber port. Tighten to 20 to 25 ft-lbs (27.1 to 33.9 Nm). Firmly tighten the rotational nut against the 5/8-inch threaded nut.
Fiber Optic Cable Installation 12 Route each fiber to its intended module through the fiber track as shown. 13 Before connection, carefully clean the optical connectors on both fiber and module according to the procedures in Care and Cleaning of Optical Connectors (on page 79).
RF Cable Installation Overview The 1.2 GHz GS7000 SHO Node can accept up to four RF cables. These cables carry forward path RF signal outputs and reverse path RF signal inputs. The RF cables also supply the 45 to 90 V AC power input. Power can also be supplied through...
RF Cable Installation If the center conductor extends past the CUT stanchion on the housing, trim the pin flush with the end of the CUT stanchion. Remove any burrs or sharp edges from the trimmed end of the pin. Trimming Using the Strip Line Mark To trim long pins using the strip line mark on the housing, follow these steps.
Chapter 3 Installation If the center conductor extends past the STRIP line on the housing, trim the pin flush with the STRIP line. Remove any burrs or sharp edges from the trimmed end of the pin. Connecting the RF Cables to the Node Housing Follow these steps to connect the RF cables.
Applying Power to the Node Overview The 1.2 GHz SHO GS7000 Node requires input power of 45 to 90 V AC from an external power source. This power is supplied through one or more of the RF cables. The powering configuration is flexible and can be changed to meet most network requirements.
Continue to Voltage Check Procedure. Voltage Check Procedure Always check both AC and DC voltages during initial setup of the 1.2 GHz GS7000 Node. Follow these steps to check AC and DC voltages. Use a true-rms DVM to check for 45 to 90 V AC input voltage at the AC test point...
Applying Power to the Node 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. Verify that the Power ON LED on the receiver module is on. Carefully close the housing lid.
Setup and Operation Introduction This chapter describes how to set up and operate the 1.2 GHz SHO GS7000 Node. These procedures assume the 1.2 GHz GS7000 Node is installed according to the procedures in Chapter 3 of this manual. Network Requirements Refer to your network design diagrams during setup.
Chapter 4 Setup and Operation Tools and Test Equipment Required Tools and Test Equipment Tools and test equipment required for setup are listed below. Equivalent items may be substituted. Ensure test equipment is calibrated and in good working order. Fluke Model 77 (or equivalent) true-rms digital voltmeter (DVM) with 0.001 resolution.
Become familiar with the function and component layout of the RF assembly before aligning the 1.2 GHz SHO GS7000 Node. The cover of the RF assembly is printed with a diagram that shows the functional signal flow and identifies each...
Chapter 4 Setup and Operation Some of these components (pads, equalizers,) are removed and replaced with different value components during the setup procedures. Forward SHO Node RF Assembly The following illustrations show the forward RF assembly. Left side Ports 1, 2, and 3 illustration.
System Diagrams Right side Ports 4, 5, and 6 illustration.
Chapter 4 Setup and Operation Forward Path Setup Procedure Introduction This procedure describes how to perform the forward path setup. Note: The procedure uses an example with a transmitter modulation index of 2.5% per channel and the 1.2GHz node with RF output level of 54 dBmV @ 1218 MHz. Setup Procedure Perform the following steps to set up the forward path.
Forward Path Setup Procedure Set the receiver module attenuator switch as follows: IF received optical power is... THEN set the attenuator switch to... Standard Receiver —2 to +2 dBm -8 dB -6 to -2 dBm 0 dB Low Input Receiver -6 to -2 dBm -8 dB -8 to -6 dBm...
See Appendix A - Technical Information for pad selection charts. 11 The SHO GS7000 Node is set for 22 dB of linear tilt between 54 and 1218 MHz. This is done by using 3 different EQ’s. A common EQ of 10.5dB value and 2 other 12dB EQ for Left side (port 1 &...
Introduction This procedure describes how to perform the reverse path setup. Perform this procedure only if the 1.2 GHz SHO GS7000 Node has an active reverse path. Optical Transmitter Setup Procedure Perform the following steps to set up the proper level into the reverse path optical transmitters.
Chapter 4 Setup and Operation Using a DVM, measure the DC voltage at the optical test point and record the value. Check the connection of the optical connector. Make sure the optical connector is seated and verify that the fiber bend radius is greater than 1 inch. WARNING: When handling optical fibers always follow laser safety precautions.
Chapter 5 Maintenance Introduction This section describes maintenance procedures for the 1.2 GHz SHO GS7000 Node. In This Chapter Opening and Closing the Housing ............. 68 Preventative Maintenance ..............70 Removing and Replacing Modules ............ 73 ...
Chapter 5 Maintenance Opening and Closing the Housing Overview Installation or maintenance of the 1.2 GHz SHO GS7000 Node requires opening the housing to access the internal modules. Proper housing closure is important to maintaining the node in good working condition.
Chapter 5 Maintenance Preventative Maintenance Overview Preventive maintenance procedures are regularly scheduled actions that help prevent failures and maintain the appearance of the equipment. Schedule Perform the preventive maintenance procedures at these intervals. Procedure Interval Visual Inspection: External Surfaces Semiannually Connectors Semiannually Indicators...
Preventative Maintenance What to Inspect How to Inspect Connectors Inspect for: broken, loose, bent, corroded, or missing pins cracked insulator inserts Wiring and cables Inspect for: cuts, nicks, burns, or abrasions exposed bare conductors sharp bends ...
Chapter 5 Maintenance WARNING: Isopropyl alcohol is flammable. Use isopropyl alcohol only in well-ventilated areas away from energized electrical circuits and heated objects such as soldering irons or open flames. Avoid excessive inhalation of vapors or prolonged or repeated contact with skin. Wear industrial rubber gloves and industrial safety goggles to avoid contact with skin.
Removing and Replacing Modules Overview This procedure describes how to remove and replace the internal modules of the 1.2 GHz SHO GS7000 Node. All field-replaceable modules can be removed and replaced without removing power from the 1.2 GHz SHO Node. Field-replaceable modules include: ...
Chapter 5 Maintenance its slot until connected to the optical interface board. 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.
Removing and Replacing Modules Pull the fiber connector straight out from the side of the module cover to remove Disassemble the fiber connector and pigtail for cleaning if necessary.
Chapter 5 Maintenance Reattach the fiber connector to the module cover and close the cover. Diplexers, Equalizer, and Trim modules The diplexer modules, equalizers, and High Pass Filter/Trim modules plug into the RF amplifier assembly through cut-outs in its cover. To remove these modules, pull up carefully on their integrated handles until they separate from the RF amplifier assembly.
Removing and Replacing Modules amplifier assembly’s rear panel connectors. Important: Be careful not to damage the housing with the screwdriver. Grasp the two metal handles on the RF amplifier assembly and carefully lift the RF assembly out of the housing. To replace the RF amplifier assembly in the housing, carefully align the assembly in the housing, lower it into place and push down to reconnect the rear panel connectors.
Chapter 5 Maintenance Close the housing. See Opening and Closing the Housing (on page 68). 10 Perform the setup procedure in Chapter 4 to verify node performance.
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.
Chapter 5 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.
Care and Cleaning of Optical Connectors WARNING: Avoid damage to your eyes! Do not look into any optical connector while the system is active. Even if the unit is off, there may still be hazardous optical levels present. Note: Read the above warning before performing cleaning procedures. Cleaning Connectors It is important that all external jumper connectors be cleaned before inserting them into the optical module.
Chapter 5 Maintenance 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. Avoid direct exposure to the laser light source. ...
This troubleshooting section lists common problems and their solutions. Replacing Modules If a troubleshooting procedure directs you to replace a module of the 1.2 GHz SHO GS7000 Node, see Removing and Replacing Modules (on page 73). In This Chapter ...
Chapter 6 Troubleshooting No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.
No RF Output at Receiver RF Test Point: Optical Power LED on Receiver Module is off Notes These notes apply to the previous troubleshooting flowchart. Note Description For standard receiver For low input receiver This unit will have no RF output. This unit will have no RF output.
Chapter 6 Troubleshooting No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.
No RF Output: Fiber Optic Light Level is Good, Receiver Optical Power LED is on...
Chapter 6 Troubleshooting Notes These notes apply to the previous troubleshooting flowchart. Note Description For standard receiver For low input receiver If the green LED is Off, it is outside If the green LED is Off, it is outside optical input range. Green (On) optical input range.
Poor C/N Performance Poor C/N Performance Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.
Attenuate the light to simulate the amount of light that should be at the amount of light that should be at the 1.2 GHz SHO GS7000 Node and rerun 1.2 GHz SHO GS7000 Node and rerun the C/N performance. Add the C/N performance.
Poor Distortion Performance Poor Distortion Performance Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.
Attenuate the light to simulate the amount of light that should be at the 1.2 GHz SHO GS7000 Node and rerun the distortion performance. If the distortion performance improves, there is too much light. An inline optical attenuator or a coupler with a higher loss can reduce the light, or the laser may have to be replaced with a lower launch power.
Poor Frequency Response Poor Frequency Response Troubleshooting Flowchart Follow this troubleshooting flowchart. Also see the notes following the chart.
The frequency response of the 1.2 GHz SHO GS7000 Node is ±1.0 dB from 52 MHz to 1218 MHz (for optical receiver and amplifier combined). It is possible that the RF amplifier is set up incorrectly. Always check to see that padding and equalization is correct to ensure proper levels at the inputs to each gain stage.
Chapter 7 Customer Support Information If You Have Questions If you have technical questions, call Cisco Services for assistance. Follow the menu options to speak with a service engineer. Access your company's extranet site to view or order additional technical publications. For accessing instructions, contact the representative who handles your account.
auto letter Appendix A Technical Information In This Appendix Linear Tilt Chart .................. 100 Forward Equalizer Chart ..............102 Introduction This appendix contains tilt, forward and reverse equalizer charts and pad values and part numbers.
Appendix A Technical Information Linear Tilt Chart Amplifier Output Linear Tilt Chart for 1.2 GHz The following chart can be used to determine the operating level at a particular frequency considering the operating linear tilt.
Linear Tilt Chart Amplifier Output Linear Tilt Chart for 1 GHz The following chart can be used to determine the operating level at a particular frequency considering the operating linear tilt. Example: If the amplifier’s 1 GHz output level is 49.0 dBmV with a linear operating tilt of 14.5 dB (from 50 to 1 GHz), the corresponding output level at 750 MHz would be 45.1 dBmV.
Appendix A Technical Information Forward Equalizer Chart 1.2 GHz Forward Linear Equalizers The following table shows the 1.2 GHz forward linear equalizer loss. EQ Value Insertion Loss at (MHz) Total Tilt (dB) 1218 1000 (52-1218 MHz) 10.5 10.5 12.0 12.0 13.5 13.5 15.0...
Forward Equalizer Chart 1 GHz Forward Linear Equalizers The following table shows the 1 GHz forward linear equalizer loss. EQ Value Insertion Loss at (MHz) Total Tilt (dB) 1000 (52-1000 MHz) 10.0 10.5 11.1 11.3 11.5 10.5 12.0 12.0 12.6 12.8 13.0 13.5...
Enhanced Digital Return Multiplexing Applications This appendix explains the installation and application of the Cisco Enhanced Digital Return (EDR) 85 Multiplexing System in the GS7000 Node. The products are intended for digital transmission of reverse path signals over a fiber optic link from the node to the headend.
Space-saving, high-density deployment in Prisma II or Prisma II XD chassis increases deployment cost-efficiency Optional monitoring of node (GS7000) and Tx (GS7000 and GainMaker) parameters available at the receiver The EDR 2:1 Enhanced Digital Return Multiplexing System leverages 2:1...
System Functional Diagrams Single Transmitter Configuration Single Transmitter Configuration for EDR 1:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with one 1:1 EDR transmitter module installed as the single transmitter. Important: This configuration requires a 4x1 Reverse Configuration Module (for...
Enhanced Digital Return System Overview Single Transmitter Configuration for EDR 2:1 Transmitter Module The following illustration shows how the GS7000 Node functions in Enhanced Digital Return configuration with one 2:1 EDR transmitter module installed as the single transmitter. Note: When the node is configured in either segmented or EDR mode, a 75 dB pad must be placed in the Tx2 SM Term.
Appendix B Enhanced Digital Return Multiplexing Applications System Block Diagram System Block Diagram for EDR 1:1 Transmitter Module The following is a block diagram of the EDR Enhanced Digital Return 1:1 Multiplexing System. System Block Diagram for EDR 2:1 Transmitter Module The following is a block diagram of the EDR Enhanced Digital Return 2:1 Multiplexing System.
Enhanced Digital Return System Overview...
Appendix B Enhanced Digital Return Multiplexing Applications EDR Transmitter Module At the transmit (node) end of the system, reverse-path RF input signals from each node port are routed to an EDR 2:1 or EDR 1:1 Transmitter module in the housing lid. The transmitter module converts each signal to a baseband digital data stream and combines the signals into a serial data stream using time-division multiplexing (TDM).
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...
2. The EDR LCM module needs to be installed for EDR transmitter status monitoring. 3. The status monitor interface is not used for data transmission. The Cisco DOCSIS transponder is needed when data transmission is required. The transmitter module uses the same style housing as the optical receivers and transmitters, except that it uses double-wide module housing.
RF output port. A single EDR Receiver module occupies one slot in a Cisco Prisma II XD chassis. Two EDR HD receiver modules can be vertically stacked in an associated Prisma II Host Module that occupies a single-wide slot in the Prisma II standard chassis.
Appendix B Enhanced Digital Return Multiplexing Applications Receiver Module Diagram The following illustration shows the receiver module. Receiver Operating Modes The receiver module supports receiver mode configuration performed by setting the proper mode ID numbers in the Prisma II Web UI system. The following diagrams provide a basic walk-through of all the supported modes for the EDR receiver module.
Enhanced Digital Return System Overview analog RF components, and then sent to the two RF connectors on the back of the module. RF 1 appears on RF port A, and RF 2 appears on RF port B. Note: The optical fiber must be plugged into the top receiver on the OPM. Dual 1:1 Mode Referring to the diagram below, the EDR transmitter digitizes a single RF signal (RF 1) into a serial stream and transmits it over optical fiber to the receiver.
Appendix B Enhanced Digital Return Multiplexing Applications Single 2:1 on Primary + Single 1:1 on Secondary This mode is a combination of the 2:1 and 1:1 modes described above. Referring to the diagram below, one EDR transmitter digitizes and combines two RF signals (RF 1 + RF 2) into one serial stream and transmits it over optical fiber to the receiver.
Enhanced Digital Return System Overview...
Appendix B Enhanced Digital Return Multiplexing Applications EDR OPM and LCM About the OPM Module The reverse transmitter converts the RF test signal(s) to an optical signal using the installed Optical Module (OPM) and transmits it to the headend (or hub site) via fiber optic cable.
Before You Begin Overview Perform these installation instructions only if you are upgrading the GS7000 Node with the EDR. If your node came with the EDR installed, go to Reverse Balancing the Node with Digital Return Modules (on page 234).
Appendix B Enhanced Digital Return Multiplexing Applications Installing the EDR Transmitter The transmitter module uses the same style housing as the optical receivers and transmitters, except that it uses double-wide module housing. As such, it occupies two standard transmitter positions in the node lid. If your EDR transmitter comes without OPM module installed, you need to order the fiber jumper and the OPM module from our sales representatives, and perform the following steps to install the OPM module and connect the fiber jumper to the...
Enhanced Digital Return (EDR) System Installation Proceed to next section for installation. The following diagram shows the OPM module installed on the 1:1 transmitter module. The following diagram shows the OPM module installed on the 2:1 transmitter module. CAUTION: Removing and installing an OPM module can shorten its useful life. Do not remove and insert OPM modules more often than is absolutely necessary.
Appendix B Enhanced Digital Return Multiplexing Applications 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 the fiber jumper.
To Connect the Long-haul Fiber Insert the fiber-optic start-head to the optical adapter. Route fiber on the fiber tray of GS7000 Node. Connect the fiber-optic end-head to the receive bore of the OPM module installed on the Receiver of the Prisma II platform.
Appendix B Enhanced Digital Return Multiplexing Applications http://www.cisco.com/en/US/tech/tk482/tk876/technologies_white_paper09186a 0080254eba.shtml To Connect the EDR LCM for Status Monitoring The LCM module is equipped with the interface ribbon cable. The cable can be used to connect the LCM module and the Status Monitor point of the desired EDR transmitter module for local status monitoring.
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 Hub ViewPort software is not available for GS7000 Node.
The following table lists the LED status and the indicated OPM, and the overdrive status of the RF port. Indication Power (PWR) Laser (LSR) OPM Module Port Input Overdrive Green Green Cisco Standard OPM Module Orange Non-Cisco Standard OPM Green (Solid) Module Cisco Standard OPM Module/ Orange...
RF port 1 and RF port 2. Indication Port 1 Input Port 2 Input Power (PWR) Laser (LSR) OPM Module Overdrive Overdrive Green Green Cisco Standard OPM Module Orange Non-Cisco Standard OPM Green (Solid) Module Orange Green Cisco Standard OPM Module (Blink)
Enhanced Digital Return Multiplexing Applications Reverse Balancing the Node with EDR Introduction This section explains the reverse balancing procedures for the GS7000 Node using EDR. When balancing the reverse path, reference your system design print for the required reverse signal level. Use appropriate padding and equalization to provide proper signal level to the reverse transmitter.
Reverse Balancing the Node with EDR The amplitude of the received test signals at the output of the reverse optical receiver in the headend or hub may be measured and monitored using the following: Spectrum analyzer (when using a CW generator for test signals) ...
Note: The ADC full-scale (100%) level for a single CW carrier is +33 dBmV. This is the level at which the ADC begins clipping. Note: The reverse attenuator (pad) and reverse equalizer in the GS7000 Node is selected during the reverse system design, and it is based on the drive level into the digital module which is determined by system performance requirements, type and quantity of return carriers, etc.
Troubleshooting Troubleshooting Equipment The following equipment may be necessary to perform some troubleshooting procedures. Cisco fiber optic ferrule cleaner, part number 468517, to clean fiber optic connectors Cisco 99% alcohol and lint free wipes to clean fiber connectors ...
Verify that connectors of the transmitter are clicked into the interface connectors in the transponder slot. If still no power supply, contact the Cisco Technical Service Center for assistance. Green Orange Non-Cisco Standard OPM No need for troubleshooting. (Solid) Module is installed.
Verify that connectors of the transmitter are clicked into the interface connectors in the transponder slot. If still no power supply, contact the Cisco Technical Service Center for assistance. Green Orange Non-Cisco Standard OPM No need for troubleshooting. (Solid) Module is installed.
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.
Troubleshooting Symptom Possible Cause Possible Solutions Faulty module. Contact the Cisco Technical Service Center for assistance.
Introduction The expanded fiber tray is an optional replacement for the standard fiber tray in the GS7000 Node. The expanded fiber tray provides additional space for fiber management/storage and the installation of additional bulkhead adaptors. The expanded fiber tray also provides the space for the installation of various passive devices such as CWDM and OADM cassettes and raw WDM cartridges.
Expanded Fiber Tray Overview Tray Components The following illustration shows the unassembled expanded fiber tray components.
Appendix C Expanded Fiber Tray Expanded Fiber Tray Installation Installation Procedure Perform the following steps to install the expanded fiber tray in the node. If you are replacing a standard fiber tray in an existing node, go to step 2. If you are not replacing a standard fiber tray, go to step 3.
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.
Appendix C Expanded Fiber Tray Pivot the fiber tray down and snap it into place on top of the power supplies with its locking tabs and in the node lid with its hold-down tab as shown in the following illustration.
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.
Appendix C Expanded Fiber Tray Proper Fiber Routing Observe the following considerations regarding fiber routing: Poor fiber routing is a major cause of bend radius violations. Proper fiber routing provides well-defined paths, making it easier to access individual fibers. Easy to follow paths aid technicians in performing fiber tracing, testing, and ...
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 ...
Appendix C Expanded Fiber Tray the three circular retaining tracks in the expanded fiber tray. The following illustrations show the available mounting clips. 2-Adaptor Clip The following illustration shows a 2-adaptor clip for bulkhead adaptors. 4-Adaptor Clip The following illustration shows a 4-adaptor clip for bulkhead adaptors. 3-Cartridge Clip The following illustration shows a 3-cartridge clip holding raw WDM cartridges.
Fiber Management System CWDM Clip The following illustration shows a CWDM clip. Cassette Device Clip The following illustration shows a cassette device clip holding a demultiplexer.
Appendix C Expanded Fiber Tray Fiber Installation For general instructions on installing and routing the fiber optic cables in the node, refer to the Fiber Optic Cable Installation (on page 42).
The following illustration shows a cartridge style WDM configuration of the expanded fiber tray. This application is used to fully segment the GS7000 4-Port Node when limited fiber counts are available, or as means to conserve fibers for future use.
Appendix C Expanded Fiber Tray illustration. Headend GS7000 Node WDMs WDMs Fwd TX Fwd RX Service Group 1 Service Group 1 Rtrn RX Rtrn TX Service Group 1 Service Group 1 Fwd TX Fwd RX Service Group 2 Service Group 2...
Configuration Examples The following illustration shows a cassette style O-Band demultiplexer configuration of the expanded fiber tray. Using the O-Band demultiplexer in the expanded fiber tray, the four multiplexed 13xx multi-wave forward path signals are demultiplexed and feed into the four individual receiver modules to achieve 4x forward segmentation with a single fiber.
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.
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.
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.
Glossary decibels relative to 1 milliwatt. dBmV decibels relative to 1 millivolt. dBuV decibels relative to 1 microvolt. decibels relative to 1 watt. directional coupler. dc, DC direct current. An electric current flowing in one direction only and substantially constant in value.
Glossary cables, etc.) used to carry signals from the headend system to subscriber terminals. digital signal processor. duplexer A device which permits the connection of both a receiver and a transmitter to a common antenna. digital voltmeter. DWDM dense wave-division multiplexing. A method of placing multiple wavelengths of light into a single fiber that yields higher bandwidth capacity.
Glossary equalization The process of compensating for an undesired result. For example, equalizing tilt in a distribution system. effective radiated power. electrostatic discharge. Discharge of stored static electricity that can damage electronic equipment and impair electrical circuitry, resulting in complete or intermittent failures. forward configuration module.
Glossary gain A measure of the increase in signal level, relative to a reference, in an amplifier. Usually expressed in decibels. Hertz A unit of frequency equal to one cycle per second. hybrid fiber/coaxial. A network that uses a combination of fiber optics and coaxial cable to transport signals from one place to another.
Glossary light-emitting diode. An electronic device that lights up when electricity passes through it. low-noise converter. Mbps megabits per second. A unit of measure representing a rate of one million bits (megabits) per second. multipath, multipath transmission The phenomenon which results from a signal traveling from point to point by more than one path so that several copies of the signal arrive at the destination at different times or at different angles.
Glossary schemes can be represented. QPSK quadrature phase-shift keying. A phase modulation technique for representing digital information. QPSK produces four discrete states, each state representing two bits of information. reverse configuration module. RCVR receiver. reverse path Signal flow direction toward the headend. radio frequency.
Glossary status monitor. status monitoring and control. The process by which the operation, configuration, and performance of individual elements in a network or system are monitored and controlled from a central location. SMIU status monitor interface unit. SNMP simple network management protocol. A protocol that governs network management and the monitoring of network devices and their functions.
Glossary watt. A measure of electrical power required to do work at the rate of one joule per second. In a purely resistive load, 1 Watt = 1 Volt x 1 Amp.
Index TX • 222 UPS • 222 uV • 222 V • 222 Visual Inspection • 124 Voltage Check Procedure • 86 W • 223 WDM Configuration Example • 209...
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