
430 Chapter 10 Testing, Troubleshooting, and Diagnostics
P0609330 2.0
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.
4 Click Loopback Tests.
The
Configuration menu option is enabled. The loopback status box displays the type of test
currently running.
5 On the
Configuration menu, click Start loopback to begin the test.
The system displays the Loopback type selection window.
6 From the drop-down menu, select the test you want to run and then click
OK. The options are
Line, Payload, Card edge or Continuity.
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.
Note: If there is an analog module in the media bay or the media is empty, the box
displays Not equipped.
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