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Huawei SmartAX MA5612 - Page 216

Huawei SmartAX MA5612
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Possible Cause Judgment Criterion Troubleshooting Method
The optical attenuation
of the optical path is
excessively small.
NOTE
l If the optical
attenuation of the
optical path is
excessively small, the
optical power received
by the ONU will
exceed the overload
optical power of the
ONU.
l Such a situation occurs
usually in labs, where
the OLT and ONU
may be directly
connected to each
other through a short
optical fiber.
If either of the following two
situations occurs, the optical
attenuation of the optical path
is excessively small.
l Measure the receive optical
power of the ONU by using
the optical power meter. It
is found that the actual
receive optical power of the
ONU is greater than -8
dBm.
l Check the optical path
between the OLT and ONU.
It is found that the optical
attenuation of the optical
path is excessively small.
The normal attenuation
range is 10-25 dB.
Add an optical attenuator on the
optical path between the OLT
and ONU.
The ODN is not properly
planned.
NOTE
l The split ratio of the
ODN link is not
determined by the
number of ONTs
connected but by the
split ratio of optical
splitters. When an
optical splitter is
connected to the ODN,
attenuation occurs and
the split ratio of the
optical splitter needs to
be calculated.
l Protocols specify that
the receive optical
power of the OLT
should not exceed 15
dB. In addition, the
difference between the
maximum optical
power and the
minimum optical
power should not
exceed 15 dB.
The ODN does not meet the
requirements of the ODN link
plan or GPON Class B+.
l Three-level splitting exists
in the ODN.
l The network coverage of
the ODN exceeds 20 km by
far.
l The split ratio exceeds the
maximum split ratio that the
board allows. Assuming
that the maximum split ratio
of a board is 1:64. If the
first-level split ratio is 1:8
and the second-level split
ratio is 1:16, the actual split
ratio is 1:128, which
exceeds the maximum split
ratio of the board.
l The optical attenuation
difference of two optical
paths exceeds 15 dB.
Optimize the ODN to meet
Huawei's ODN planning
requirements and protocol
requirements.
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.
207

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