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

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If the number of the pulses detected during the total length of the specified pulse detection intervals is
smaller than the pulse-recovery threshold, a LOS alarm occurs. For example, if the two thresholds take
their defaults, a LOS alarm is generated if the number of pulses detected within 176 pulse intervals is less
than 22.
Examples
# Set the number of detection intervals to 300 for the pulse detection duration threshold.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] ft1 alarm-threshold los pulse-detection 300
Related commands
ft1 frame-format
ft1 bert
Use ft1 bert to start a BERT test on a T1-F interface.
Use undo ft1 bert to stop the BERT test running on a T1-F interface.
Syntax
ft1 bert pattern { 2^20 | 2^15 } time minutes [ unframed ]
undo ft1 bert
Default
No BERT test is performed.
Views
T1-F interface view
Predefined user roles
network-admin
Parameters
pattern: Sets a BERT pattern.
• 2^15: Specifies the pattern length (in bits) as two to the fifteenth power.
• 2^20: Specifies the pattern length (in bits) as two to the twentieth power.
time minutes: Sets the duration (in minutes) of a BERT test. The minutes argument is in the range of 1 to
14 4 0 .
unframed: Sets the test pattern to cover the overhead bits of the frame.
Usage guidelines
The T1-F interface supports only the 2^15 and 2^20 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 ft1 command.