252CHAPTER 15: T1-F INTERFACE CONFIGURATION COMMANDS

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 (slots 1 through 24). In ESF framing, both LLB code and PLB code are sent/received in the FDL in ESF frames.

You can use this command only when the far-end CT1/PRI interface can automatically detect loopback request code from the network.

Example # Send in-band LLB activation request code.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] ft1 sendloopcode inband-llb-up

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3Com MSR 30, MSR 50 manual T1-F Interface Configuration Commands