Nortel Meridian Meridian 1, Planning, Installation And Operating Instructions

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Page 506 of 536 Chapter 25 — Fault locating and clearing
553-3121-210 Standard 3.0 January 1999
Possible cause Action
Defective trunk circuit
card Hardware disable then re-enable the circuit card to initiate a
self-test. If the test fails, replace the circuit card. If the test passes,
follow the procedure below.
Disconnect the wiring between the circuit card and the
cross-connect terminal.
Enable the TN by entering
LD 32
ENLU c u
(“c u” represents card and unit numbers)
Wait for an OVD message.
If you receive an OVD message, replace the circuit card.
If you do not receive an OVD message, reconnect the wiring and go
to the next possible cause.
Defective wiring At the main cross-connect terminal, disconnect the wiring to the CO
or other trunk equipment (such as a music source or paging
equipment).
Enable the TN and wait for an OVD message. If you receive an
OVD message, repair or replace the wiring to the PE card.
If there is no OVD message, repair or replace the wiring from the
cross-connect terminal to the trunk.
If the trunk circuit card still will not enable or there is still a trunk
problem, reconnect the wiring and go to the next possible cause.
Enable the TN by entering
LD 32
ENLU c u
(“c u” represents card and unit numbers)
Wait for an OVD message.
If you receive an OVD message, replace the circuit card.
If you do not receive an OVD message, reconnect the wiring and go
to the next possible cause.
—continued—