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

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Usage guidelines
You can test E1 channels by using the loopback command with different keywords.
In an internal loopback, data of the sender is directly looped to the receiver.
In an external payload loopback, data received by the receiver is looped back at the E1 framer as
payload.
In an external loopback, data received by the receiver is looped back directly without passing through
the E1 framer.
Examples
# Enable external payload loopback on E1 channel 1.
<Sysname> system-view
[Sysname] controller cpos 1/0
[Sysname-Cpos1/0] e1 1 set loopback payload
Related commands
display controller cpos e1
e1 shutdown
Use e1 shutdown to shut down an E1 channel.
Use undo e1 shutdown to bring up an E1 channel.
Syntax
e1 e1-number shutdown
undo e1 e1-number shutdown
Default
E1 channels are up.
Views
CPOS interface view
Default command level
2: System level
Parameters
e1-number: Number of an E1 channel on the CPOS interface, in the range of 1 to 63.
Usage guidelines
Shutting down an E1 channel also shuts down the serial interfaces that are formed on it.
Examples
# Shut down E1 channel 1.
<Sysname> system-view
[Sysname] controller cpos 1/0
[Sysname-Cpos1/0] e1 1 shutdown
e1 unframed
Use e1 unframed to set an E1 channel on a CPOS interface to operate in unframed mode.