R3102-R3103-HP 6600/HSR6600 Routers Interface Command Reference

163
Default command level
2: System level
Parameters
pattern: Sets a bit error rate test (BERT) pattern, which could be 2^7, 2^11, 2^15, or QRSS.
2^7: Specifies the length of transmitted BERT pattern, in bits, as two to the seventh power.
2^11: Specifies the length of transmitted BERT pattern, in bits, as two to the eleventh power.
2^15: Specifies the length of transmitted BERT pattern, in bits, as two to the fifteenth power.
qrss: Specifies the length of transmitted BERT pattern, 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 of a BERT test, in the range of 1 to 1440 minutes.
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 CT3
interface supports only 2^7, 2^11, 2^15, and QRSS.
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 whether the condition of the line is good. 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 far-end loopback.
You may view the state and result of the BERT test with the display controller t3 command.
Examples
# Run a 10-minute QRSS BERT test on CT3 interface T3 2/0/0.
<Sysname> system-view
[Sysname] controller t3 2/0/0
[Sysname-T3 2/0/0] bert pattern qrss time 10
cable (CT3 interface)
Use cable to configure the cable length on the CT3 interface.
Use undo cable to restore the default.
Syntax
cable feet
undo cable
Default
The cable length is 49 feet (14.9 meters).
Views
CT3 interface view
Default command level
2: System level