R2511-HP MSR Router Series Interface Command Reference(V5)

199
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 can 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.
<Sysname> system-view
[Sysname] controller t3 2/0
[Sysname-T3 2/0] 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
Parameters
feet: Cable length in the range of 0 to 450 feet (0 to 137.2 meters).
Usage guidelines
The cable length in this command refers to the distance between the router and the cable distribution
rack.
Examples
# Set the cable length to 50 feet (15.2 meters) on interface T3 2/0.
<Sysname> system-view
[Sysname] controller t3 2/0
[Sysname-T3 2/0] cable 50
clock (CT3 interface)
Use clock to configure clock source for the CT3 interface.
Use undo clock to restore the default.