Avaya 03-300430 User Manual

This test performs a far-end loop around to a far-end switch over an ISDN trunk. The trunk’s 
service state must be in-service, maint-NE, or out-of-service/NE, and no call can be active on 
the trunk.

Note:

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:

 This test does not execute on a G700 Media Gateway.

A test call connection is established to a far-end switch over the ISDN trunk to be tested. The 
digital port on a TN711D Maintenance/Test circuit pack generates a test-pattern bit stream that 
is sent to the far-end switch and echoed back. The received pattern is then compared to the 
sent pattern and checked for errors that indicate a loss of integrity on the communications path.
If a test call is running when scheduled maintenance starts, the green LED is turned off. To 
determine whether a test call is still running:

●

Enter list isdn-testcall and status isdn-testcall.

●

Check for a lit amber LED on the Maintenance/Test circuit pack.

There are two ways to place an outgoing test call over trunk-side ISDN-BRI facility:

1. The test call connection is established over the TDM bus of the transmit and receive sides 

of the trunk-side ISDN-BRI facility to a digital trunk testing port on the Maintenance/Test 
circuit pack. The Maintenance/Test Digital Port generates a pseudo bit stream.

2. The test call connection is established over the TDM bus of the transmit and receive sides 

of the trunk-side ISDN-BRI facility to a data channel. This method is selected when no 
Maintenance/Test circuit pack resides in the system.

A test is run periodically to check if the call is hung. If so, it gracefully tears down the call to 
release the resources.

FAIL

Internal system error

1. Retry the command at 1-minute intervals up to 5 times.

2. If the test continues to fail, escalate the problem.

PASS

The audit passed successfully.

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