Nortel Meridian 1 Manual page 157

Possible cause
Disabled or
defective TN
Defective trunk
card
Defective wiring
Defective DTR,
TDS, or MFS
Excessive traffic in
the system
Action
Test TNs on superloops by entering:
LD 30
UNTT l s c u "l s c u" represents loop, shelf, card, and unit numbers.
Test TNs on other loops by entering:
LD 45
TEST
If the test fails, replace the indicated item and test again.
If the card is an E&M or universal trunk card, unseat, then reinstall the
card to initiate a self-test.
If the test fails, replace the card.
If the test passes, go to the next possible cause.
At the main cross-connect terminal, disconnect the wiring to the CO or
other trunk equipment.
Enable the TN and wait for an OVD message. If you receive an OVD
message, repair or replace the wiring to the PE shelf.
If there is no OVD message, repair or replace the wiring from the
cross-connect terminal to the telephone.
If the trunk card still will not enable or there is still a trunk problem,
reconnect the wiring and go to the next possible cause.
Use the attendant console to seize trunks and audibly test for dial tone
and outpulsing, or use a maintenance telephone and enter:
LD 36
TRK l s c u
Note: See the X11 input/output guide for information on using this test.
If you do not hear outpulsing, the digitone receiver, tone and digit switch,
or multifrequency sender may not be sending or receiving digits and the
fault will affect more than one trunk. See the procedures for clearing faults
on this equipment.
If there is no problem with this equipment, go to the next possible cause.
Additional trunk cards may be required to handle the traffic in the system.
See Traffic measurement formats and output (553-2001-450).
Clearing trunk faults
Meridian 1 Fault clearing
Page 143 of 190