284CHAPTER 17: FUNDAMENTAL CT3 INTERFACE CONFIGURATION COMMANDS

View CT3 interface view

Parameter line-number: T1 line number, in the range 1 to 28.

fdl: Sets the FDL format of T1.

ansi: Adopts ANSI T1.403 for FDL.

att: Adopts AT&T TR 54016 for FDL.

both: Adopts both ANSI T1.403 and AT&T TR 54016 for FDL.

none: Disables the use of FDL on the T1 line.

Description Use the t1 set fdl command to set the behavior of the specified T1 line on the FDL in ESF framing.

Use the undo t1 set fdl command to disable FDL of T1.

By default, FDL is disabled.

FDL is an embedded 4 kbps overhead channel within the ESF format for transmitting periodical performance report (PPR) statistics or loopback code.

According to ANSI T1.403, the format of PPR is LAPD, and the format of loopback code is BOP.

The t1 set fdl command only starts PPR transmission. It cannot enable loopback code transmission or detection.

These two commands only apply to channelized T1 lines with their T1 frame format being ESF.

Example # Set the FDL to be ANSI T1.403 compliant for T1 line 1 on CT3 interface T3 2/0.

<Sysname> system-view

[Sysname] interface t3 2/0

[Sysname-T3 2/0] t1 1 set fdl ansi

t1 show

Syntax t1 line-number show

View CT3 interface view

Parameter line-number: T1 line number, in the range 1 to 28.

show: Displays the physical line state of the specified T1 line.

Description Use the t1 show command to have a quick look at the line state of the specified T1 line on the CT3 interface.

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3Com MSR 30, MSR 50 manual T1 show