Huawei RRU3203 Hardware Maintenance Manual page 4

RRU3203
Hardware Maintenance Guide
After an RRU is powered on, check the status of RRU indicators and voltage. Before the RRU
is powered off, follow the normal power-off or emergency power-off procedure as required.
4 Replacing an RRU
A distributed base station consists of RRUs and a BBU. Replacing an RRU interrupts all the
services carried by the RRU, and alarms are generated.
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.
Conventions
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol
General Conventions
The general conventions that may be found in this document are defined as follows.
Convention
Times New Roman
Boldface
Italic
Courier New
Issue 04 (2011-09-15)
Description
Indicates a hazard with a high level of risk, which if not
avoided, will result in death or serious injury.
Indicates a hazard with a medium or low level of risk, which
if not avoided, could result in minor or moderate injury.
Indicates a potentially hazardous situation, which if not
avoided, could result in equipment damage, data loss,
performance degradation, or unexpected results.
Indicates a tip that may help you solve a problem or save
time.
Provides additional information to emphasize or supplement
important points of the main text.
Description
Normal paragraphs are in Times New Roman.
Names of files, directories, folders, and users are in
boldface. For example, log in as user root.
Book titles are in italics.
Examples of information displayed on the screen are in
Courier New.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
About This Document
iii