Huawei RRU Hardware Maintenance Manual page 48

RRU
Hardware Maintenance Guide
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Context
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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 Power off the RRU according to the instructions in
Step 3 Loosen the screws on the cover plate of the RRU cabling cavity using an M4 Phillips
screwdriver, and then open the cover plate.
Step 4 Record the connections of the optical module and optical fibers.
Step 5 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.
Issue 16 (2015-03-23)
− If the software version does not support query of the type of the optical module by
using an MML command, obtain all types of optical modules.
− If a fault in the optical module on the RRU side causes disconnection of the CPRI
link, the MML command to query the type of the fault cannot be used. In this case,
query the type of the corresponding optical module on the BBU side instead and
obtain a new optical module of the same type. For the detailed querying method, see
the DBS3900 Site Maintenance Guide.
The following tools and materials are available: ESD gloves, M4 Phillips screwdrivers,
and an ESD box or bag.
Optical modules are inserted into CPRI ports on an RRU.
If the optical module, cable, or optical cable is removed and then connected to the same
CPRI port of the RRU, the optical module, cable, or optical cable is hot swappable.
If the optical module, cable, or optical cable is removed and then connected to a different
CPRI port of the RRU, the optical module, cable, or optical cable is still hot swappable,
but you need to perform either of the following operations to manually reset the RRU to
prevent service interruption.
− For a NodeB, eNodeB, and eGBTS, run the RST BRD command to reset the RRU.
− For a GBTS, run the RST BTSBRD command to reset the RRU.
It takes about five minutes to replace an optical module on the RRU, 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.
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5 Replacing an Optical Module
3.2 Powering Off an RRU.
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