5 Replacing the Optical Module
The optical module implements optical-electrical conversion, thus enabling optical transmission
between the RRU and other devices. You need to remove the optical cable before replacing the
optical module. Replacing the optical cable disrupts the transmission of CPRI signals.
Prerequisite
l The types and quantity of faulty optical modules are confirmed, and new optical modules
are ready.
l The tools and materials, such as an ESD wrist strap or ESD gloves, ESD box or bag, M4
screwdriver, and wrench are ready.
Context
l The optical modules are installed on the CPRI0 and CPRI1 ports of the RRU.
l The optical module is hot-swappable.
l It takes about five minutes to replace the optical module of the RRU, which involves
disconnecting the optical cables, removing the faulty optical module, inserting a new optical
module, reconnecting the optical cables, and waiting for the CPRI links to resume.
Procedure
Step 1 Wear an ESD wrist strap or a pair of ESD gloves.
WARNING
Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD
gloves, to prevent electrostatic damage to the boards, modules, or electronic components.
Step 2 Loosen the screw for protecting the cabling cavity on the cover plate by using the M4
screwdriver, and then open the cabling cavity of the RRU by lifting the handle on the cover plate.
Step 3 Record the connections of the optical modules and optical cables.
Step 4 Remove the DB15 connector from the alarm cable, press down the latch on the optical connector,
and then remove the connector from the faulty optical module.
RRU3908 V2
Hardware Maintenance Guide 5 Replacing the Optical Module
Issue 01 (2010-04-10) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-1
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