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

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Usage guidelines
The CT1/PRI 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 the BERT test, use the display controller t1 command.
Examples
# Run a 10-minute 2^20 BERT test on T1 2/4/0.
<Sysname> system-view
[Sysname] controller t1 2/4/0
[Sysname-T1 2/4/0] bert pattern 2^20 time 10
cable (CT1/PRI interface)
Use cable to set the cable attenuation and length on a CT1/PRI interface.
Use undo cable to restore the default.
Syntax
cable { long { 0db | -7.5db | -15db | -22.5db } | short { 133 ft | 266ft | 399ft | 533ft | 655ft } }
undo cable
Default
The cable length is long 0db.
Views
CT1/PRI interface view
Predefined user roles
network-admin
Parameters
long: Matches 199.6-meter (655-feet) and longer cable length. The options for this parameter include
0db, -7.5db, -15db, and -22.5db. The attenuation parameter is selected depending on the signal quality
received at the receiving end. No external CSU is needed.
short: Matches a cable length shorter than 199.6 meters (655 feet). The options for this parameter
include 13 3f t , 266ft, 399ft, 533ft, and 655ft. The length argument is selected depending on the actual
transmission distance.
Usage guidelines
You can use this command to adapt signal waveform to different transmission conditions such as the
quality of the signal received by the receiver. If the signal quality is good, you can use the default setting.
The CT1/PRI interface does not need an external CSU device.
Examples
# Set the cable length to 40.5 meters (133 feet) on CT1/PRI interface T1 2/4/0.
<Sysname> system-view
[Sysname] controller t1 2/4/0