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TIE-TRK (Tie Trunk)
Issue 5 October 2002
1695
555-233-119
Figure 53. Tie Trunk Interactions
The number of tests to be implemented for Tie Trunk maintenance depends upon
the TIE-TRK circuit packs involved. The test are as follows:
1. NPE Crosstalk Test—Verifies the switch connection operation of the circuit
pack. It verifies that the trunk circuitry talks only on the selected time slot on
the TDM Bus and that it never crosses over to time slots reserved for other
connections.
2. Loop Around and Conference Circuit Test—Verifies the transmission
operation of the circuit pack. It verifies that signals are transmitted to and
from each port (Loop Around within the port), and it tests the conference
capabilities of all ports.
This test may fail due to noise induced by adjacent electric power lines.
Customers having this problem should resolve it with their local power
company. To temporarily alleviate the alarm caused by the failure of this
test, the test may be disabled from trunk administration test field.
3. Several seizure tests, including the following:
— Tie Trunk Seizure Test verifies the seizure capabilities of the circuit
pack. For the TN2140B circuit pack, this test activates the M lead
and checks for a response from the distant end within 10 seconds.
This test ABORTS on trunk ports administered as access endpoints.
— Seizure Test (for TN497 circuit packs only)—Verifies the seizure
capabilities of the circuit pack. This test seizes the trunk and
outpulses a “pause.” The port reports the result of the seizure
attempt uplink. The test can be disabled via Trunk Group
Administration.
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