Nortel Modular ICS 6.0 Installer's Manual page 526

Nortel modular ics 6.0 digital system package

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Line loopback

The line loopback test loops the full 1.544 Mbps signal

received from the network back to the network. The looped

signal is regenerated without any change in the framing format

and without the removal of any bipolar violations. The line

loopback test can also be invoked and stopped remotely using

the in-band signal or via the facility data link (FDL) in

extended super frame (ESF) format.

The line loopback test must be run in coordination with the T1

or PRI service provider. Some test patterns can cause the DTI

to reset. To avoid this, start the line loopback test from your

system before the T1 or PRI service provider begins their test,

and stop the line loopback test from your system after the T1

or PRI service provider ends their test.

Modular ICS 6.0 Installer Guide

Troubleshooting