Maintenance Object Repair Procedures
555-233-123
10-1692 Issue 4 May 2002
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 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.
There are two methods available to place an outgoing ISDN Trunk-side BRI trunk
test call:
1. The test call connection is established over the TDM Bus of the transmit
and receive sides of the ISDN Trunk-side BRI trunk to a data channel. This
method is selected when no Maintenance/Test circuit pack resides in the
system.
2. The test call connection is established over the TDM Bus of the transmit
and receive sides of the ISDN Trunk-side BRI trunk to a digital trunk testing
port on the Maintenance/Test circuit pack. The Maintenance/Test Digital
Port generates a pseudo bit stream.
A test is run periodically to check if the call is hung. If so, it gracefully tears down
the call to release the resources.
Synchronous Commands
You can demand a synchronous outgoing test call by using the following
maintenance commands:
■ test trunk trunk-group-no/member-no long [repeat number]
■ test board PCsspp long [repeat number]
■ test port port-location long [repeat number]
Whenever a circuit translates to an ISDN Trunk-side BRI trunk during a Long Test
Sequence, an outgoing test call is invoked, and the duration of the test call is 8.6
seconds. Once the test call completes, the bit error rate is retrieved from the
Maintenance/Test Digital Port. A bit error rate greater than zero is reported as a
failure to the Manager I terminal (MGRI). A failure indicates the need to run further
diagnostics.
If no Maintenance/Test circuit pack exists, the outgoing ISDN Trunk-side BRI trunk
test call is established over a high-speed data channel on the Network Control
(NETCON) circuit pack (DATA-BD).
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