Huawei NE05E Hardware Manual page 230

HUAWEI NE05E,NE08E
Hardware Guide
●
●
Precautions for the overload-caused burnt optical module
●
●
●
Issue 05 (2023-03-31)
If a receptacle or an optical connector has not been used for a long time and
has not been covered with a dust cap, you should clean it before using it. A
cotton swab is used to clean a receptacle, and a cleaning tissue is used to
clean an optical connector.
NO TE
During the cleaning process, insert the cotton swab and turn it slowly in the
receptacle. Do not use too much force, because the receptacle may be damaged.
If, for no apparent reason, optical signals are lost during the operation of a
device, use the preceding method to clean the receptacle or the optical
connector. This will eliminate contamination as the cause of the signal loss.
When using an OTDR to test the connectivity or the attenuation of optical
signals, disconnect the optical connector from the optical module. Otherwise,
the optical module may be burnt.
When performing a self-loop test, use an optical attenuator. Do not loosen
the optical connector.
It is required that a long-distance optical module have an input optical power
of less than -7 dBm. If the input optical power is larger than -7 dBm, you
need to add an optical attenuator. For example, if the transmitting optical
power is X dBm and the optical attenuation is Y dB, the receiving optical
power is X-Y, which must be smaller than -7dBm (X-Y<-7 dBm).
Copyright © Huawei Technologies Co., Ltd.
3 Hardware Description
222