Cisco GS7000 Guide

Maintenance
This section describes maintenance procedures for the 1.2 GHz GS7000 Remote PHY Device (RPD) 2X2
Segmentable Node.
•Opening and Closing the Housing, on page 1
•Preventative Maintenance, on page 2
•Removing and Replacing Modules, on page 5
•Care and Cleaning of Optical Connectors, on page 10
Opening and Closing the Housing
Installation or maintenance of the node requires opening the housing to access the internal modules.
Proper housing closure is important to maintaining the node in good working condition. Proper closure ensures
a good seal against the environment, protecting the internal modules.
Opening the Housing
Open the housing as follows.
1. Remove the bolts securing the lid to the base.
2. Carefully open the lid to allow access to the inside of the housing.
3. Inspect gaskets on the cover flange and on the test port plugs.
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.
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Use caution when closing housing. Improper closing may result in the unit not being sealed from the
environment.
Caution
3. For strand-mounted housings, pull the lid away from the base and remove the slack from the hinge before
rotating the lid up toward the base.
4. Ensure no cables are pinched between lid and base.
5. Secure lid to base with bolts. Tighten from 5 to 12 ft-lbs (6.8 to 16.3 Nm) in the sequence shown in the
following illustration. Repeat the sequence twice, ending with the final torque specification.
Preventative Maintenance
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.
IntervalProcedure
Visual Inspection:
Semiannually
External Surfaces
SemiannuallyConnectors
SemiannuallyIndicators
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Maintenance
Preventative Maintenance

IntervalProcedure
AnnuallyWiring/Cable Assemblies
Cleaning:
Annually
External Surfaces
AnnuallyExternal Controls/Connectors
AnnuallyInternal Connectors/Circuit Cards
Visual Inspection
Visually inspect the following items.
How to InspectWhat to Inspect
Inspect for:
• dust, dirt, lubricants, or other foreign matter worn spots or deep scratches
on surfaces
• corrosion
• marred protective finish exposing bare metal
• missing, incorrect or obliterated marking, decals, or reference designators
Exterior surfaces
Inspect for:
• broken, loose, bent, corroded, or missing pins
• cracked insulator inserts
Connectors
Inspect for:
• cuts, nicks, burns, or abrasions
• exposed bare conductors
• sharp bends
• pinched or damaged wires
• broken or loose lacing or clamps
Wiring and cables
Cleaning
Clean exterior surfaces of the equipment at least annually.
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Maintenance
Visual Inspection

Consumable Materials
Use the materials listed below (or equivalent) when cleaning the equipment.
SpecificationItem
TT-I-735Isopropyl alcohol
CC-C-440Cheesecloth
(none)Spray-type contact cleaner
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 with clean cheesecloth moistened with isopropyl alcohol or general-purpose
detergent. Do not let alcohol or detergent get inside equipment or connectors.
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. Do not take internally. Failure to comply with this admonishment can cause injury,
physical disorder, or death.
Warning
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.
Caution
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/cm2, or 103.43 kPa).
6. Clean interior surfaces with clean cheesecloth moistened with isopropyl alcohol or general-purpose
detergent.
7. Clean internal electrical contacts with clean cheesecloth moistened with spray-type contact cleaner.
8. Dry interior with clean, dry cheesecloth.
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Maintenance
Consumable Materials

Removing and Replacing Modules
This procedure describes how to remove and replace the internal modules of the node. All field-replaceable
modules can be removed and replaced without removing power from the node.
Field-replaceable modules include:
• Forward optical receiver modules
• Reverse optical transmitter modules
• Status monitor/local control module
• Forward configuration module
• Reverse configuration module
• Equalizers
• Node signal directors
• Power supply modules
• RF amplifier assembly
• RPD Module
Removing power from the 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.
Caution
Module Replacement Procedure
Follow this procedure to remove and replace an optical receiver, optical transmitter, optical amplifier, optical
switch, status monitor/local control module, or power supply module.
1. Open the housing. See Opening and Closing the Housing, on page 1.
2. Carefully tag and remove any optical fibers from RPD, receiver or transmitter module.
Laser light hazard. Never look into the end of an optical fiber or connector. Failure to observe this warning
can result in eye damage or blindness.
Warning
3. Loosen the screws securing the module.
4. Lift the module straight up out of the housing to unplug it.
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Maintenance
Removing and Replacing Modules

Pull up on the built-in handle on RPD, receiver module, transmitter module, status monitor/local control
module, or power supply module.
Note
5. Position the new module in the same location and carefully slide the module into its slot until connected
to the optical interface board.
6. Tighten the screws securing the module. Torque screws to 25 to 30 in-lbs (2.8 to 3.4 Nm).
7. Carefully reconnect any optical fibers that were removed from the original module. Clean optical connectors
before reconnecting. See Care and Cleaning of Optical Connectors, on page 10 for cleaning procedure.
Laser light hazard. Never look into the end of an optical fiber or connector. Failure to observe this warning
can result in eye damage or blindness.
Warning
8. Close the housing. See Opening and Closing the Housing, on page 1.
If you are using a Local Control Module in the node be sure to 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.
Important
9. Perform the setup procedure in Setup and Operation to verify node performance.
Accessing the Receiver/Transmitter Module Fiber Spool and Connector
Optical receivers and transmitter modules have an integrated fiber spool inside the module housing. This
allows the fiber pigtail to be spooled up and contained within the module housing.
You may need to access this spool to clean or replace a fiber pigtail or connector.
Follow this procedure to access the module fiber spool and connector.
1. Pull up on the two module cover knurled tabs. Use a slight rocking motion.
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 the cover.
Note
The module cover opens as shown.
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Maintenance
Accessing the Receiver/Transmitter Module Fiber Spool and Connector

2. Pull the fiber connector straight out from the side of the module cover to remove it.
3. Disassemble the fiber connector and pigtail for cleaning if necessary.
4. Reattach the fiber connector to the module cover and close the cover.
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Maintenance
Accessing the Receiver/Transmitter Module Fiber Spool and Connector

Forward/Reverse Configuration Module, Equalizer, and Node Signal Director
Replacement Procedure
The forward and reverse configuration modules, equalizers, and node signal directors plug into the RF amplifier
assembly through cut-outs in its cover.
To remove these modules, pull up carefully on their integrated handles until they separate from the RF amplifier
assembly.
RF Amplifier Assembly 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 1.
2. Remove the AC power shunts and make a note of their location for reinstallation in the replacement RF
amplifier assembly.
Damage to the node may result if AC power shunts are not removed before replacing the RF amplifier assembly.
Caution
3. Unplug AC1/DC connector, forward path connector, reverse path connector and AC2 connector on the
RF amplifier assembly.
4. Loosen the seven shoulder screws securing the RF amplifier assembly to the housing.
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Maintenance
Forward/Reverse Configuration Module, Equalizer, and Node Signal Director Replacement Procedure

The screw locations are identified by number, 1 through 7.
Note
5. Insert a flat-blade screwdriver into the small holes in the metal handles on each side of the RF amplifier
assembly and pry up carefully to disconnect the RF amplifier assembly’s rear panel connectors.
Be careful not to damage the housing with the screwdriver.
Important
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Maintenance
RF Amplifier Assembly Replacement Procedure

6. Grasp the two metal handles on the RF amplifier assembly and carefully lift the RF assembly out of the
housing.
7. 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.
8. Secure the RF amplifier assembly to the housing with the seven cross-head shoulder screws.
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).
Important
9. Plug AC1/DC connector, forward path connector, reverse path connector and AC2 connector on the RF
amplifier assembly.
10. Reinstall the AC power shunts in their proper locations on the RF amp assembly.
11. Close the housing. See Opening and Closing the Housing, on page 1.
12. Perform the setup procedure in Setup and Operation to verify node performance.
Care and Cleaning of Optical Connectors
Proper operation of this equipment requires clean optical fibers. Dirty fibers will adversely affect performance.
Proper cleaning is imperative.
Caution
The proper procedure for cleaning optical connectors depends on the connector type. The following describes
general instructions for fiber-optic cleaning. Use your company's established procedures, if any, but also
consider the following.
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Maintenance
Care and Cleaning of Optical Connectors

Cleaning fiber-optic connectors can help prevent interconnect problems and aid system performance. When
optical connectors are disconnected or reconnected, the fiber surface can become dirty or scratched, reducing
system performance.
Inspect connectors prior to mating, clean as needed, and then remove 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 Fiber-Optic Connector Performance
• Do not connect or disconnect optical connectors with optical power present.
• Always use compressed air before cleaning the fiber-optic connectors and when cleaning connector end
caps.
• Always install or leave end caps on connectors when they are not in use.
• If you have any degraded signal problems, clean the fiber-optic connector.
• Advance a clean portion of the ferrule cleaner reel for each cleaning.
• Turn off optical power before making or breaking optical connections to avoid microscopic damage to
fiber mating surfaces.
To Clean Optical Connectors
• 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.
• Avoid personal injury! Viewing the laser output with optical instruments (such as eye loupes, magnifiers,
or microscopes) may pose an eye hazard.
Warning
• Connect or disconnect fiber only when equipment is OFF or in Service mode.
• Do not apply power to this equipment if the fiber is unmated or unterminated.
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Maintenance
Recommended Equipment

• Do not look 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 such as eye loupes, magnifiers, or microscopes.
•Use safety-approved optical fiber cable to maintain compliance with applicable 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 supplied with clean optical connectors and bulkheads. Clean these connectors and bulkheads
in the field only if you observe and can verify an optical output problem.
Connectors and Bulkheads
Most fiber optic connectors are of the physical contact (PC) type. PC type connectors are designed to touch
their mating connector to prevent air gaps, which cause reflections. For optimum performance, all dirt must
be removed.
Bulkheads can also become dirty enough to affect performance, either from airborne dust or from contamination
introduced by connectors.
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.
Warning
Read the above warning before performing cleaning procedures.
Note
Cleaning Connectors
It is important that all external jumper connectors be cleaned before inserting them into the optical module.
Follow these steps to clean fiber optic connectors that will be connected to the optical module:
Before you begin, remove optical power from the module or ensure that optical power has been removed.
Important
1. Inspect the connector through an optical connector scope. If the connector is damaged, e.g., scratched,
burned, etc., replace the jumper.
2. If the connector is dirty but otherwise undamaged, clean the connector as follows:
1. Make several swipes across the face of the connector with the appropriate ferrule cleaner. This will
remove dust and some films.
2. Listen for a slight "squeak" typically generated during this process, indicating a clean connector.
3. Inspect the connector again through the scope to confirm that it is clean.
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Maintenance
Connectors and Bulkheads

3. If a second inspection indicates that further cleaning is needed:
1. Use 99% isopropyl alcohol and a lint-free wipe to clean the connector.
2. Use the appropriate ferrule cleaner again to remove any film left over from the alcohol.
3. 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
It is generally more difficult to clean bulkhead connectors and verify their condition due to limited accessibility
of the fiber end face. For this reason, even on products with accessible bulkhead connectors, you should only
attempt to clean a bulkhead connector when a dirty connector is indicated.
Note
Follow these steps to clean the bulkhead:
• 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.
• Avoid personal injury! Viewing the laser output with optical instruments (such as eye loupes, magnifiers,
or microscopes) may pose an eye hazard.
Warning
1. Insert a dry bulkhead swab into the bulkhead and rotate the swab several times.
2. Remove the swab and discard. Swabs may be used only once.
3. Check the bulkhead optical surface with a fiber connector scope to confirm that it is clean. If further
cleaning is needed:
1. Moisten a new bulkhead swab using a lint-free wipe moistened with optical-grade (99%) isopropyl
alcohol.
2. With the connector removed, fully insert the bulkhead swab into the bulkhead and rotate the swab
several times.
3. Remove the swab and discard. Swabs may be used only once.
4. Check with a fiber connector scope again to confirm that there is no dirt or alcohol residue on the
optical surface.
5. 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.
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Maintenance
Cleaning Bulkheads

5. It is also recommended that all connectors be visually inspected after cleaning to verify the connector is
clean and undamaged.
Verifying Equipment Operation
Perform circuit turn-up. If the equipment does not come up, i.e., fails verification or indicates a reflection
problem, clean the connectors and bulkheads again.
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Maintenance
Verifying Equipment Operation