DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-752ISDN-TRK (DS1 ISDN Trunk)
3
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-servic e, maint-NE, or out-of-service/NE, and
no call can be ac tive on the trunk. The test call can be initiated as part of a long
test sequence , or as an individual t est, as described below. Thi s test is valid only
for systems using country p rotocol 1 (including US), or when the far end has
loop-around capability.
A test call connection is es tablished to a far-end switc h over the ISDN trunk to be
tested. The digital por t on a TN711D Maintenance/Test circuit pack generates a
test-pattern bit stream which is sent to the far-end switch and ec hoed back. The
received pattern is then c ompared to the sent patter n and checked for errors that
indicate a loss of integ rity on the communications path.
If a test call is running when sc heduled maintenance starts, the green LED is
turned off. To determine if a test call is still running, use the list isdn-t estcall and
status isdn-testcall commands. A lit yellow LED on the Maintenanc e/Test circuit
pack also indic ates that a test call is running.
1113 ABORT The signaling link has failed, so the system cannot send any messages on
behalf of this trunk.
1. Check the results of Test #255 (Signaling Link State Check).
1114 ABORT The signaling link is in a transitional state.
1. Retry the command at 1-minute intervals a maximum of 5 times.
1116 ABORT The trunk is in an out-of-servic e ISDN service state.
1. A call cannot be present if the trunk is in an ISDN out-of-service state,
so a call state audit would be inappropriate. No action necessary. (Use
the status trunk
2100 ABORT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals a maximum of 5 times.
FAIL Internal system error
1. Retry the command at 1-minute intervals a maximum of 5 times.
PASS This switch sent a call state aud iting 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 3-317. TEST #257 Call State Audit Test — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page