R0106-HP MSR Router Series Interface Command Reference(V7)

143
Examples
# Clear statistics for Serial 2/1/0.
<Sysname> reset counters interface serial 1/0
CE3 interface commands
bert
Use bert to start a BERT on a CE3 interface.
Use undo bert to stop the BERT test running on a CE3 interface.
Syntax
bert pattern { 2^7 | 2^11 | 2^15 | qrss } time number [ unframed ]
undo bert
Default
No BERT test is performed.
Views
CE3 interface view
Predefined user roles
network-admin
Parameters
pattern: Sets a BERT test pattern.
• 2^7: Specifies the pattern length (in bits) as two to the seventh power.
• 2^11: Specifies the pattern length (in bits) as two to the eleventh power.
• 2^15: Specifies the pattern length (in bits) as two to the fifteenth power.
• qrss: Specifies the pattern length (in bits) as two to the twentieth power. In this pattern, the presence
of 14 consecutive zeros is not allowed.
time number: Sets the duration (in minutes) of a BERT test. The number argument is in the range of 1 to
14 4 0 .
unframed: Sets the overhead bits of the padding frames for a BERT test.
Usage guidelines
The CE3 interface supports the 2^7, 2^11, 2^15, and QRSS BERT patterns defined in ITU O.151, ITU
O.153, and ANSI T1.403-1999.
To perform a BERT test, the local end sends out a pattern. The pattern is looped over on the line and sent
back to the local end. The local end examines the received pattern for bit error rate to help determine the
line condition. You must configure loopback to allow the transmitted pattern to loop back from a specific
point on the line. For example, enable far-end loopback on the remote interface.
To display the state and result of a BERT test, use the display controller e3 command.
Examples
# Run a 10-minute QRSS BERT test on CE3 interface E3 2/4/0.
<Sysname> system-view