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DRH
Hardware Maintenance Guide
Procedure
Step 1 Wear ESD gloves.
Take proper ESD protection measures, for example, wear ESD gloves, to prevent electrostatic
damage to the boards, modules, or electronic components.
Step 2 Loosen the screws on the cover plate of the DRH cabling cavity using an M4 Phillips
screwdriver, and then open the cover plate.
Step 3 Record the connections of the optical module and optical fibers.
Step 4 Press the latch on the optical fiber connector, and then remove the connector from the faulty
optical module.
Do not look into the optical fiber or optical module without eye protection after the optical
fiber is removed from the optical module.
Step 5 Lower the puller on the faulty optical module, and then pull the puller until the optical module
is removed from the DRH.
Step 6 Choose the optical module of the same type as the faulty optical module according to the label
on the module. Install the new optical module into the DRH.
Step 7 Insert the optical fiber connector into the new optical module.
Step 8 Check the operating status of the new DRH by observing the status of DRH indicators. For
details about the status of indicators, see section "DRH Indicators" in the DRH Hardware
Description.
Step 9 Reconnect the cables in the cabling cavity.
Step 10 Close the cabling cavity of the DRH and use an M4 Phillips screwdriver to tighten the screws
on the cover plate for the cabling cavity.
Step 11 Take off the ESD gloves, and pack up all the tools.
----End
Issue 1.0(2013-04-10)
It takes about five minutes to replace an optical module on the DRH, which involves
disconnecting optical fibers, removing the faulty optical module, inserting a new optical
module, reconnecting the optical fibers, and waiting for CPRI links to resume.
The optical modules to be installed must match CPRI rates.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5 Replacing an Optical Module
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