l If the queried result is far lower than the rate of the program traffic, the program traffic
loses packets before reaching the ONU upstream port. It is assumed that the program
traffic loses packets on the line between the OLT and the ONU. Then, go to Step 3.
Step 2 Check the upper-layer network and devices of the OLT.
1. Find the possible cause according to judgment criteria described in Table 5-10 and then
troubleshoot the fault. Then, go to Step 2.2 to check whether the fault is rectified.
Table 5-10 Troubleshooting method of faulty upper-layer network and devices of the OLT
Possibl
e
Cause
Judgment Criterion Troubleshooting Method
The
multica
st
source
is
abnorm
al.
Pixelation occurs when a user watches
a program ordered from the multicast
server.
TIP
If other users can watch the program
successfully, the multicast source is
normal.
Replace the multicast source.
The
upper-
layer
network
quality
of the
OLT is
poor.
Ping the multicast router and multicast
server from the OLT separately. It is
found that packet loss occurs.
TIP
If other users of the OLT can watch the
program, the network between the OLT and
the multicast server is normal.
Troubleshoot the fault on the line
between the OLT and the multicast
router or the fault on the line
between the OLT and the multicast
server.
2. Order the program to check whether the user can watch the program successfully.
l If the user can watch the program successfully, go to Step 7.
l If the user cannot watch the program, go to Step 2.3.
3. Check whether packets are lost on the upstream port of the OLT.
l If the packets are lost on the upstream port of the OLT, go to Step 6.
l If no packet is lost on the upstream port of the OLT, the fault on the line between the
OLT and the multicast server is rectified. Then, troubleshoot the fault in other fault
scopes according to the location where packet loss occurs and go to Step 1.
Step 3 Check the line between the OLT and the ONU.
1. On the OLT, run the display alarm history all command to query historical alarms and
run the display event history all command to query historical events to check whether
alarms or events related to the PON line (line between the OLT and the ONU) are generated
on the OLT.
l If such alarms or events are generated, clear them by referring to the relevant instruction
documents. Then, go to Step 3.2.
l If no such alarms or events are generated, go to Step 4.
2. Order the program to check whether the user can watch the program successfully.
l If the user can watch the program successfully, go to Step 7.
SmartAX MA5612 Multi-service Access Module
Maintenance Guide
5 Troubleshooting Services Transmitted Through a GPON
Port
Issue 01 (2012-07-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
163
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