R2511-HP MSR Router Series Interface Command Reference(V5)

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[Sysname-Cpos1/0] t1 1 set frame-format sf
t1 set loopback
Use t1 set loopback to configure the loopback mode of a T1 channel.
Use undo t1 set loopback to disable loopback.
Syntax
t1 t1-number set loopback { local | payload | remote }
undo t1 t1-number set loopback
Default
Loopback is disabled.
Views
CPOS interface view
Default command level
2: System level
Parameters
t1-number: Number of a T1 channel on the CPOS interface, in the range of 1 to 84.
local: Enables internal loopback.
payload: Enables external payload loopback.
remote: Enables external loopback.
Usage guidelines
Loopback is intended for test use. Disable it otherwise.
Examples
# Enable external loopback on T1 channel 1.
<Sysname> system-view
[Sysname] controller cpos 1/0
[Sysname-Cpos1/0] t1 1 set loopback payload
Related commands
display controller cpos t1
t1 shutdown
Use t1 shutdown to shut down a T1 channel.
Use undo t1 shutdown to bring up a T1 channel.
Syntax
t1 t1-number shutdown
undo t1 t1-number shutdown
Default
T1 channels are up.