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Chapter 10 Testing, Troubleshooting, and Diagnostics 449

Business Communications Manager - Management User Guide

Line loopback test

The line loopback test loops the full 1.544 Mbps signal received from the network back to the

network. The looped signal regenerates 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 DTM 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.

Payload loopback test

The payload loopback test loops the received information bits (192 per frame) back to the network.

You can also remotely invoke and stop the payload loopback test through the facility data link

(FDL) in extended super frame (ESF) format.

The payload loopback test must be run in coordination with the T1 service provider. Some test

patterns can cause the DTM to reset. To avoid this, start the payload loopback test from your

system before the T1 service provider begins their test, and stop the payload loopback test from

your system after the T1 service provider ends their test.

Card loopback test

The card edge loopback test loops the outgoing signal on the DTM back to its internal received

signal path. The system disconnects signal paths to the external network.

Continuity loopback test

The continuity loopback test shorts the tip and ring pair of the receive signal path with the transmit

signal path. This test allows you to check the metallic continuity of the external wiring.

Start a loopback test

1 Choose Diagnostics, Trunk Modules.

2 Double click the bus that contains the card you want to test. For example, Bus 02.

3 Double click the appropriate module on this bus. For example, Module 1.

Warning: Give notice that you are running a loopback test.

Calls on all T1 or PRI lines on the DTM are automatically dropped when a loopback test is

invoked. Use the Page feature to notify people using the system that a test is about to begin

and that calls will be disconnected.

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