DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-971ISDN-TRK (DS1 ISDN Trunk)
9
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 which 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 if a test call is still running, use the
list isdn-testcall
and
status isdn-testcall
commands. A lit yellow LED on the Maintenance/Test circuit
pack also indicates that a test call is running.
PASS This switch sent a call state auditing message to the far-end switch to verify the
state of the call active on this trunk. If a call state mismatch is found, then the
call will be torn down within two minutes. If no call was active, then no message
was sent.
Table 9-374. TEST #257 Call State Audit Test — Continued
Error
Code
Tes t
Result Description/ Recommendation
Continued on next page
