Avaya S8700 Maintenance Manual page 1728

Maintenance-Object Repair Procedures
ISDN Test Call Test (#258)
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. The test call can be initiated as part of a long
test sequence, or as an individual test, as described below. This test is valid only
for systems using country protocol 1 (including US), or when the far end has
loop-around capability.
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:
Issue the list isdn-testcall and status isdn-testcall commands.
Check for a lit amber LED on the Maintenance/Test circuit pack.
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M/T
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TN771
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G3r Switch originating test call
Figure 8-54. Outgoing ISDN-PRI Test Call
Synchronous Test Calls
You can initiate a synchronous outgoing test call by entering one of the following
commands:
test trunk group#/member# long [repeat #]
test board UUCSS long [repeat #]
test port UUCSSpp long [repeat #]
8-1006 Issue 1 May 2002
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TDM Bus
UDS1
TN464
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ISDN Trunk
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DS1 Facility
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terminating capability
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Far-End Switch
with test call
555-233-143