R0106-HP MSR Router Series Interface Command Reference(V7)

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When a CT3 interface is operating in channelized mode, its T1 lines might use separate clocks.
Examples
# Set the clock mode to slave for the T1 line 1 on T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] t1 1 clock slave
t1 fdl
Use t1 fdl to set the behavior of a T1 line on the FDL in ESF framing.
Use undo t1 fdl to disable FDL of T1.
Syntax
t1 line-number fdl { ansi | att | both | none}
undo t1 line-number fdl
Default
FDL is disabled.
Views
CT3 interface view
Predefined user roles
network-admin
Parameters
line-number: Specifies a T1 line number in the range of 1 to 28.
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.
Usage guidelines
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.
This command only applies to channelized T1 lines with a T1 frame format of ESF.
Examples
# Set the FDL to be ANSI T1.403 compliant for T1 line 1 on T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] t1 1 fdl ansi