3Com MSR 50, MSR 30 manual Related command display controller cpos e1, 679

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Description Use the e1 set frame-formatcommand to set the framing format of an E1 channel.

Use the undo e1 set frame-formatcommand to restore the default, that is, no-CRC4.

Example # Set E1 channel 1 to use framing format CRC4.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos1/0] e1 1 set frame-format crc4

e1 set loopback

Syntax e1 e1-numberset loopback { local payload remote }

undo e1 e1-numberset loopback

View CPOS interface view

Parameter e1-number: Number of an E1 channel on the CPOS interface, in the range 1 to 63. local: Enables internal loopback on the E1 channel.

payload: Enables external payload loopback on the E1 channel.

remote: Enables external loopback on the E1 channel.

Description Use the e1 set loopback command to configure the loopback mode of the E1 channel.

Use the undo e1 set loopback command to remove a loopback.

By default, loopback is disabled.

You may test E1 channels in different depths 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.

Related command: display controller cpos e1.

Example # Enable external payload loopback on E1 channel 1.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos1/0] e1 1 set loopback payload