NOTE
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 technical support personnel to confirm whether it is a Huawei-certified optical
module.
Common Faults of an 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.
Measures to Prevent a Loosened Optical Module
1.
When installing an optical module, insert it in position. If you hear a click or feel a slight
shake, it indicates that the latch boss is secured.
If the latch boss is not secured, the gold finger of the optical module is not in good
contact with the connector on the board. In this case, the link may be connected but
optical signals will be cut off or the optical module will be loosened when the optical
module is shaken or hit.
2.
shows the release handle on an optical module when it is open and closed.
When inserting the optical module, make sure that the release handle is closed. At this
time, the latch boss locks the optical module. After the optical module is inserted, try
pulling it out to see if it is installed in position. If the optical module cannot be pulled
out, it is secured.
Figure 6-167
State of the release handle
Close the release handle
Open the release handle
AP8082DN and AP8182DN
Hardware Installation and Maintenance Guide
6 Appendix
Issue 03 (2019-04-01)
Copyright © Huawei Technologies Co., Ltd.
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