R240D
Hardware Installation and Maintenance Guide
5 Appendix
Issue 03 (2016-01-26)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
95
Figure 5-94
Labels for AC power cables
Meaning of the label in Figure 5-94.
On the equipment cabinet side, the label marked "A01-AC1" indicates that the power
cable is connected to the first AC power socket of row A and column 01 in the equipment
room.
On the power socket side, the label marked "B01-AC1" indicates that the power cable is
connected to the first AC power socket in the cabinet of row B and column 01 in the
equipment room.
5.5 Guide to Using Optical Modules
Common Faults of an Optical Module
The system may fail to obtain information about non-Huawei-certified optical modules or obtain
incorrect information. You are advised to use Huawei-certified optical modules. Obtain the electronic
label of the optical module and contact Huawei technical support personnel to confirm whether it is a
Huawei-certified optical module.
1.
An optical module is not completely installed in position.
If the optical module is not completely installed in position and the latch boss is not
secured, the device cannot identify the optical module. After the optical module works
for a long time, it will be ejected under external stress.
2.
The optical receptacle on an optical module is contaminated.
If an optical module is not cleaned or protected properly, contaminants may accumulate
on the fiber pin in the optical module. As a result, the coupling efficiency is reduced,
optical signals are cut off, or even worse, the surface of the fiber pin is damaged
permanently.
3.
An optical module is burnt.
If high-power optical signals (caused by an optical time domain reflectometer or
self-loop test) are transmitted through an optical module that is used for long-distance
transmission but no optical attenuator is used, the optical power will exceed the overload
power of the avalanche photodiode (APD). Then the optical module is burnt.
The preceding faults lead to temporary or long-term cut-off of optical signals; or even cause
permanent damages to the optical module, affecting communication services.
