Command Reference Guide

3Com Router 5000 Family and Router 6000 Family t1 bert ● 313

Command Reference

Description ITU O.151, ITU O.153, and ANSI T1.403-1999 define many BERT patterns, among

which, t1 lines on the CT3 interface support only 2^11, 2^15, 2^20, 2^23, and QRSS

at present.

When running a BERT test, the local end sends out a pattern, which is to be looped

over somewhere on the line and back to the local end. The local end then checks the

received pattern for the bit error rate, and by so doing helps you determine whether

the condition of the line is good. To this end, you must configure loopback to allow

the transmitted pattern to loop back from somewhere on the line, for example, from

the far-end interface by placing the interface in far-end loopback.

You may view the state and result of the BERT test with the display controller

command.