Huawei SmartAX MA5612 Maintenance Manual page 86

SmartAX MA5612 Multi-service Access Module
Maintenance Guide
2.
Step 4 Check the user terminal.
1.
Issue 01 (2012-07-25)
Possibl Judgment Criterion
e
Cause
The If one of the following symptoms
maximu occurs, the fault is because the
m maximum bandwidth of the user is
bandwi higher than the downstream line rate
dth of and the fast leave function is not
the user enabled.
is
l Pixelation occurs only when
higher
programs are switched.
than the
l Run the display igmp user user-
downstr
index command to query the fast
eam line
leave attribute (Quick leave) and
rate and
the maximum bandwidth of the
the fast
program (User MaxBandWidth).
leave
The Quick leave is disable and the
function
maximum bandwidth is higher than
is not
the downstream line rate.
enabled
NOTE
.
l When a user switches between channels
using a remote controller, two IGMP
packets are transmitted at the same
time, including one leave packet and
one join packet. Before the previous
program stops, traffic of two programs
exists over the subscriber line. If no
sufficient bandwidth is available for the
traffic of two programs over the line,
packet loss occurs due to traffic
overflow. As a result, pixelation occurs.
l When a user switches between channels
frequently, traffic of multiple multicast
groups exists over the line.
l After the maximum bandwidth of a user
is limited, the user cannot order a new
program if the bandwidth of the new
ordered program is larger than the value
(the maximum bandwidth - the used
bandwidth). This ensures that the
program that is being watched is not
affected.
Order the program to check whether the user can watch the program successfully.
l If the user can watch the program successfully, go to
l If the user cannot watch the program, go to
Find the possible cause according to judgment criteria described in
troubleshoot the fault. Then, go to
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4 Troubleshooting Services Transmitted Through a GE Port
Troubleshooting Method
Run the igmp user modify user-
index max-bandwidth command
to modify the maximum bandwidth
of the user to be lower than the line
rate.
Step 4.
Step 4.2 to check whether the fault is rectified.
Step 6.
Table 4-11 and then
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