3Com MSR 50, MSR 30 manual Ft1 sendloopcode, 251

251

Use the undo ft1 alarm-thresholdcommand to restore the defaults.

Example # Set the number of detection intervals to 300 for the pulse detection duration threshold.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] ft1 alarm-threshold los pulse-detection 300

ft1 sendloopcode

Syntax ft1 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 }

View T1-F interface view

Parameter fdl-ansi-llb-down: Sends ANSI-compliant LLB deactivation request code in the FDL to removes 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 or AT&T implementation to start remote loopback.

Description Use the ft1 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 T1-F 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.