3Com 3031 Command Reference Manual page 170

3com 3031: reference guide

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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 E1 3/0/0 to perform local loopback.

[3com-E1 3/0/0]loopback local

pri-set timeslot-list [ range ]

undo pri-set

CE1/PRI interface view

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

31. 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 CE1/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 perform pri-set bundling on a CE1/PRI interface, you should note that you

are not allowed to bundle only timeslot 16, as it will be used as the D channel for

transmitting signals. Attempts to bundle only timeslot 16 will fail.

In a pri-set formed by bundling the timeslots of a CE1/PRI interface, timeslot 0 is

used for Frame Synchronization Control (FSC), timeslot 16 as a D channel for

signaling transmission, and other timeslots as B channels for data transmission.

You may bundle the timeslots except for timeslot 0 into a pri-set (as the D channel,

timeslot 16 is automatically bundled). The logic features of this pri-set will be the

same like those of an ISDN PRI interface. If no timeslots are specified for bundling,

all the timeslots except for timeslot 0 will be bundled into an interface similar to an

ISDN PRI interface in the form of 30B+D.