R3303-HP HSR6800 Routers Interface Command Reference

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Default
No remote loopback control code is sent.
Views
CT1 interface view
Default command level
2: System level
Parameters
fdl-ansi-llb-down: Sends ANSI-compliant LLB deactivation request code in the FDL to remove loopback.
fdl-ansi-llb-up: Sends ANSI-compliant line loopback (LLB) activation request code in the FDL to start
remote loopback.
fdl-ansi-plb-down: Sends ANSI-compliant PLB deactivation request code in the FDL to remove loopback.
fdl-ansi-plb-up: Sends ANSI-compliant payload loopback (PLB) activation request code in the FDL to start
remote loopback.
fdl-att-plb-down: Sends AT&T-complaint PLB deactivation request code in the FDL to remove 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 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 may configure loopback on the remote CT1 interface by sending loopback request code.
In LLB mode, all 193 bits (one synchronization bit and 192 effective bandwidth bits) in a T1 PCM frame
are looped back. In PLB mode, however, only 192 effective bandwidth 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 five minutes without affecting the operation of other interfaces.
Examples
# Send in-band LLB activation request code.
<Sysname> system-view
[Sysname] controller t1 2/0/0
[Sysname-T1 2/0/0] sendloopcode inband-llb-up