3Com 3031 Command Reference Manual page 199

3com 3031: reference guide

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Table of Contents

Fundamental CT3 Interface Configuration Commands

c-bit: Sets the frame format to C-bit.

m23: Sets the frame format to m23.

Using the frame-format command, you can configure the frame format used by a

CT3 interface. Using the undo frame-format command, you can restore the

default frame format used by the CT3 interface.

By default, the CT3 interface adopts the C-bit frame format.

Set the frame format of the interface T3 1/0/0 to m23.

[3com-T3 1/0/0] frame-format m23

loopback { local | payload | remote }

undo loopback

CT3 interface view

local: Enables the CT3 interface to perform local loopback.

payload: Places the CT3 interface in an external payload loop. Data passes the

framer in this case and will be looped back after payload is generated.

remote: Enables the CT3 interface to perform remote loopback. Data does not go

through the framer in this case and will be looped back before the payload has

been generated.

Using the loopback command, you can configure the loopback mode of a CT3

interface. Using the undo loopback command, you can disable the CT3 interface

to perform loopback.

By default, loopback is disabled on the CT3 interface.

Loopback is usually used for some special detection. It should not be enabled in

normal working condition.

If a CT3 interface encapsulated with PPP has been set to perform loopback, it is

normal for the state of its link layer protocol to be reported as DOWN.