Possible Cause
Judgment Criterion
Troubleshooting Method
The optical module of the
ONU is abnormal. For
example, the transmit
optical power of the
optical module is
excessively small or its
receiver sensitivity is
low.
Replace the faulty ONU with a
normal one. It is found that the
new ONU is auto discovered by
the OLT.
An alternative is to locate the
fault as follows:
l
Set the optical module of
the ONU to the continuous
mode, and measure the
transmit optical power by
using the optical power
meter. It is found that the
actual transmit optical
power is beyond the normal
range (-1.5 dBm to +5
dBm).
l
Measure the receive optical
power of the ONU by using
the optical power meter. It
is found that the actual
receive optical power is
within the normal range
(-27 dBm to -8 dBm).
Replace the faulty ONU or the
optical module of the ONU.
The Patch cord of the
ONU is broken or bent
excessively.
Check the Patch cord of the
ONU. It is found that the Patch
cord is broken or bent
excessively.
Replace the Patch cord of the
ONU.
Step 4
Record the results of the preceding steps in the form for reporting a fault (see Fault Report Form),
fill out the entire form, and then submit the form to Huawei for technical support (see
).
Step 5
End.
----End
6.1.3 GPON ONU Frequently Goes Online and Offline
ONUs connected to a GPON port frequently go online and offline and thus the OLT reports a
large number of ONU LOS alarms and relevant recovery alarms.
Location Method
NOTE
An ONU frequently goes online and offline because the OLT receives weak ONU signals. As a result,
packets exchanged between the OLT and the ONU are lost.
When an ONU frequently goes online and offline, locate the fault based on the following fault
symptoms and possible causes.
SmartAX MA5612 Multi-service Access Module
Maintenance Guide
6 System Fault Handling
Issue 01 (2012-07-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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