3Com MSR 50, MSR 30 manual T1 set loopback, T1 set fdl, View CT3 interface view, 283

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You can configure this command only when the T1 line is working in framed format (which can be set by using the undo t1 unframed command).

Related command: t1 unframed.

Example # Set the framing format to SF for the first T1 line on interface T3 2/0.

<Sysname> system-view

[Sysname] interface t3 2/0

[Sysname-T3 2/0] t1 1 set frame-format sf

t1 set loopback

Syntax t1 line-numberset loopback { local remote payload }

undo t1 line-numberset loopback

View CT3 interface view

Parameter line-number: T1 line number in the range 1 to 28. local: Sets the T1 line in internal loopback mode. remote: Sets the T1 line in external loopback mode. remote: Sets the T1 line in payload loopback mode.

Description Use the t1 set loopback command to set the loopback mode of a T1 line on the T3 interface.

Use the undo t1 set loopback command to disable the T1 line to loop back.

By default, loopback is disabled on T1 lines.

Loopback is intended for test use. Disable it otherwise.

If a T1 line encapsulated with PPP is placed in loopback mode, it is normal that the state of the link layer protocol is reported down.

Example # Enable internal loopback on the first T1 line on interface T3 2/0.

<Sysname> system-view

[Sysname] interface t3 2/0

[Sysname-T3 2/0] t1 1 set loopback local

t1 set fdl

Syntax t1 line-numberset fdl { ansi att both none}

undo t1 line-numberset fdl