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SmartAX MA5612 Multi-service Access Module
Maintenance Guide
Location Method
When pixelation occurs in an FTTB or FTTC network,
fault in different scopes.
Table 5-9 Possible causes of the fault in different scopes
Fault Scope
User terminal to the
ONU
ONU to the OLT
Upper-layer
network and devices
of the OLT
To facilitate fault report, save the results of the following steps.
Procedure
Step 1 Order a program again and perform the following steps to determine the location at which
multicast packets are lost.
1.
2.
Issue 01 (2012-07-25)
Possible Cause
l The rate configured in the traffic profile bound to the traffic stream
is lower than the bandwidth of the multicast program.
l The QoS rate limitation on the port is excessively low.
l If pixelation occurs only in program switching, the maximum
bandwidth used by the user may be higher than the downstream
line rate and the fast leave function may not be enabled.
l The STB is faulty.
l The TV set is faulty.
Packet loss occurs on the line between the ONU and the OLT.
l The multicast source is abnormal.
l The network quality is poor. The network communication failure
occurs on the line between the OLT and multicast router, and
between the multicast router and multicast server.
CAUTION
On the OLT, run the display multicast flow-statistic vlan 3 ip 224.1.1.1 command to
query the traffic statistics of the ordered program on the upstream port (assume that the
MVLAN ID is 3 and the IP address of the multicast program is 224.1.1.1).
l If the queried result is close to the rate of the program traffic, the program traffic reaches
the OLT upstream port. Then, go to
l If the queried result is far lower than the rate of the program traffic, the program traffic
loses packets before reaching the OLT upstream port. Then, go to
On the ONU, run the display multicast flow-statistic ip 224.1.1.1 vlan 3 command to
query the traffic statistics of the ordered program on the upstream port (assume that the
MVLAN ID is 3 and the IP address of the multicast program is 224.1.1.1).
l If the queried result is close to the rate of the program traffic, the program traffic reaches
the ONU upstream port. It is assumed that packets loss occurs on the ONU, user
terminal, or on the line between the ONU and the user terminal. Then, go to
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5 Troubleshooting Services Transmitted Through a GPON
Table 5-9
Step
1.2.
shows possible causes of the
Step
2.
Step
Port
4.
162
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Table of Contents
Troubleshooting
