5
Replacing an Optical Module
An optical module implements optical-electrical conversion, enabling optical transmission
between an RRU and other devices. You must disconnect fiber optic cables from an optical
module before replacing the optical module. Disconnecting the fiber optic cables interrupts the
transmission of CPRI signals.
Prerequisite
l
The type and number of optical modules to be replaced are confirmed, and new optical
modules are ready.
l
Tools and materials, such as ESD gloves, M4 Phillips screwdrivers, and an ESD box or
bag, are ready.
Context
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Optical modules are inserted into CPRI_W and CPRI_E ports on an RRU.
l
Optical modules are hot-swappable when the same CPRI ports are used.
l
It takes about five minutes to replace an optical module on the RRU, which involves
disconnecting fiber optic cables, removing the faulty optical module, inserting a new optical
module, reconnecting the fiber optic cables, and waiting for CPRI links to resume.
Procedure
Step 1
Wear ESD gloves.
CAUTION
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 six screws on the cover plate of the RRU cabling cavity using an M4 Phillips
screwdriver, and then open the cover plate.
Step 3
Record the connections of the optical module and fiber optic cables.
Step 4
Press the latch on the fiber optic cable connector, and then remove the connector from the faulty
optical module.
RRU3203
Hardware Maintenance Guide
5 Replacing an Optical Module
Issue 04 (2011-09-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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