HP MSR2000/3000/4000 Router Series Interface Command Reference

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Syntax
bert pattern { 2^20 | 2^15 } time minutes [ unframed ]
undo bert
Default
No BERT test is performed.
Views
CT1/PRI interface view
Predefined user roles
network-admin
Parameters
pattern: Sets a bit error rate test (BERT) pattern, which can be 2^15 or 2^20.
2^15: Specifies the length of transmitted BERT pattern, in bits, as two to the fifteenth power.
2^20: Specifies the length of transmitted BERT pattern, 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
1,440.
unframed: Sets the test pattern to cover the overhead bits of the frame.
Usage guidelines
ITU O.151, ITU O.153, and ANSI T1.403-1999 define many BERT patterns, among which, the CT1/PRI
interface supports only 2^15 and 2^20.
When running a BERT test, the local end sends out a pattern, which is to be looped over somewhere on
the line and back to the local end. The local end then examines the received pattern for bit error rate to
help you identify the condition of the line. You must configure loopback to allow the transmitted pattern
to loop back from somewhere on the line, for example, from the far-end interface by placing the interface
in a far-end loopback.
You can view the state and result of the BERT test with the display controller t1 command.
Examples
# Run a 10-minute 2^20 BERT test on CT1/PRI interface t1 2/0.
<Sysname> system-view
[Sysname] controller t1 2/0
[Sysname-T1 2/0] bert pattern 2^20 time 10
cable (CT1/PRI interface)
Use cable to set the cable attenuation and length on the CT1/PRI interface.
Use undo cable to restore the default.
Syntax
cable { long { 0db | -7.5db | -15db | -22.5db } | short { 133 f t | 266ft | 399ft | 533ft | 655ft } }
undo cable
Default
The cable length is long 0db.