3Com 3031 Command Reference Manual page 177

3com 3031: reference guide

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Fundamental CT1/PRI Interface Configuration Commands

local: Enables the CT1/PRI interface to perform local loopback.

remote: Enables the interface to perform remote loopback.

Using the loopback command, you can enable a CT1/PRI interface to perform

loopback. Using the undo loopback command, you can disable the CT1/PRI

interface to perform loopback.

By default, the interface is disabled to perform loopback in any form.

Loopback is used to check the condition of interface or cable. This function should

be disabled when they are in normal operation.

If a serial interface formed by bundling timeslots of the CT1/PRI interface is

encapsulated with PPP and is set to perform loopback, it is normal for the state of

the link layer protocol to be reported as DOWN.

Set the interface T1 1/0/0 to perform local loopback.

[3com-T1 1/0/0]loopback remote

pri-set [ timeslot-list range ]

undo pri-set

CT1/PRI interface view

range: The number of the timeslots that are bundled, which is in the range of 1 to

24. When specifying the timeslots to be bundled, you can specify a single timeslot

by specifying a number, a range of timeslots by specifying a range between

number1-number2, or several discrete timeslots by specifying number1,

number2-number3.

Using the pri-set command, you can bundle the timeslots of a CT1/PRI interface

into a pri-set. Using the undo pri-set command, you can remove the timeslot

By default, no timeslots are bundled into pri-set.

When performing pri-set bundling on a CT1/PRI interface, you should note that

you are not allowed to bundle only timeslot 24, because it is the D channel for

transmitting signals. Attempts to bundle only timeslot 24 will fail.