3com MSR 20-20 참조 매뉴얼

C

HAPTER

 17: F

UNDAMENTAL

 CT3 I

NTERFACE

 C

ONFIGURATION

 C

OMMANDS

CT3 interface view

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.

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.

# 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 line-number show

CT3 interface view

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

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

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