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

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fdl-att-plb-down: Sends AT&T-complaint PLB deactivation request code in the FDL to remove remote
loopback.
fdl-att-plb-up: Sends AT&T-complaint PLB activation request code in the FDL to start remote loopback.
inband-llb-down: Sends in-band LLB deactivation request code in compliance with the ANSI or AT&T
implementation to remove remote loopback.
inband-llb-up: Sends in-band line loopback (LLB) activation request code compliant with the ANSI and
AT&T implementation to start remote loopback.
Usage guidelines
You can configure loopback on the remote CT1/PRI interface by sending loopback request code.
In LLB mode, all 193 bits (one synchronization bit and 192 effective payload bits) in a T1 PCM frame are
looped back. In PLB mode, however, only 192 effective payload bits are looped back.
The format of loopback code is compliant with ANSI T1.403 or AT&T TR 54016.
In SF framing, LLB code is sent using the effective bandwidth. In ESF framing, both LLB code and PLB code
are sent and received in the FDL.
Use this command in conjunction with the far-end T1 device. The far-end device must be able to set
loopback mode depending on the detected loopback code. The sending of remote loopback control
code lasts 5 minutes without affecting the operation of other interfaces.
Examples
# Send in-band LLB activation request code.
<Sysname> system-view
[Sysname] controller t1 2/4/0
[Sysname-T1 2/4/0] sendloopcode inband-llb-up
E1-F interface commands
clock-change auto
Use clock-change auto to enable automatic clock mode switchover on the interface.
Use undo clock-change auto to disable the automatic clock mode switchover.
Syntax
clock-change auto
undo clock-change auto
Default
Automatic clock mode switchover is disabled.
Views
E1-F interface view
Predefined user roles
network-admin