Fault
Scope
Symptom Possible Cause
ODN
NOTE
ODN
failures
are
generally
caused by
large
reflection
and
attenuatio
n caused
by
improper
optical
compone
nts,
design, or
constructi
on.
A single ONU or some
ONUs connected to an
OLT fail to go online.
l The branch fiber is bent excessively.
l The branch fiber connector is not clean.
l The quality of branch fiber splicing is poor. For
example, the splicing point has air bubbles.
l Different types of branch fiber connectors are
interconnected.
l The multi-mode optical fiber is used as the
branch fiber.
l The ODN is not properly planned. For
example, the split ratio, network coverage and
attenuation difference are not planned within
the proper ranges.
l The optical attenuation of the optical path is
excessively small.
l A branch fiber break occurs.
l The optical splitter is faulty or the connectors
on the optical splitter are not clean.
All the ONUs connected to
a PON port of an OLT fail
to go online.
l The backbone fiber is bent excessively.
l The backbone fiber connector is not clean.
l The quality of branch fiber splicing is poor. For
example, the splicing point has air bubbles.
l Different types of backbone fiber connectors
are interconnected.
l The multi-mode optical fiber is used as the
backbone fiber.
l A backbone fiber break occurs.
l The optical splitter is faulty or the connectors
on the optical splitter are not clean.
ONU
A single ONU or some
ONUs connected to an
OLT fail to go online.
l The ONU is not powered on.
l The information (including SN and password)
for ONU authentication conflicts; hence, the
later power-on ONU fails to go online.
l A rogue ONU (such as a continuous-mode
ONU) exists on the network and affects other
ONUs.
l The ONU hardware is faulty.
l The optical module of the ONU is faulty.
l The Patch cord of the ONU is broken or bent
excessively.
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.
202
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