3Com MSR 50, MSR 30 manual Sendloopcode, 229

229

sendloopcode

Syntax sendloopcode { fdl-ansi-llb-down fdl-ansi-llb-up fdl-ansi-plb-down fdl-ansi-plb-up fdl-att-plb-down fdl-att-plb-up inband-llb-down inband-llb-up }

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Parameter 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 compliant 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.

Description Use the sendloopcode command to send remote loopback control code.

By default, no remote loopback control code is sent.

You may configure loopback on the far-end CT1/PRI 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 can be 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/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.