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

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Default
The framing format of an E1 channel is no-CRC4.
Views
CPOS interface view
Predefined user roles
network-admin
Parameters
e1-number: Specifies an E1 channel by its number on the CPOS interface. The value range for this
argument is 1 to 63.
crc4: Sets the framing format to CRC4.
no-crc4: Sets the framing format to no-CRC4.
Examples
# Set E1 channel 1 to use the framing format CRC4.
<Sysname> system-view
[Sysname] controller cpos 2/4/0
[Sysname-Cpos2/4/0] e1 1 set frame-format crc4
e1 loopback
Use e1 loopback to set the loopback mode of an E1 channel.
Use undo e1 loopback to disable loopback.
Syntax
e1 e1-number loopback { local | payload | remote }
undo e1 e1-number loopback
Default
Loopback is disabled on an E1 channel.
Views
CPOS interface view
Predefined user roles
network-admin
Parameters
e1-number: Specifies an E1 channel by its number on the CPOS interface. The value range for this
argument is 1 to 63.
local: Enables internal loopback.
payload: Enables external payload loopback.
remote: Enables external loopback.
Usage guidelines
You can test E1 channels by using the loopback command with different keywords.
• In an internal loopback, the sender's data is directly looped to the receiver.