Nortel Meridian 1 Planning, Installation And Operating Instructions page 539

Page 520 of 536
Possible cause
Defective PE circuit
card
Defective telephone
553-3121-210 Standard 3.0
Chapter 25 — Fault locating and clearing
Action
Software disable the TN indicated by the OVD message by entering
LD 32
DISU c u
("c u" represent card and unit number)
Disconnect the wiring between the PE circuit card and the
cross-connect terminal.
Re-enable the TN by entering
ENLU c u
Wait for an OVD message.
If you receive a message indicating a problem with the circuit card
or unit, replace the circuit card.
If you do not receive a message indicating a problem with the circuit
card or unit, reconnect the wiring and go to the next possible cause.
If the telephone is a Meridian Digital Telephone, enter
LD 32
IDU c u
If there is no response, replace the telephone.
If there is an appropriate response, continue this procedure.
Disable the telephone TN. Disconnect the wiring from the telephone
to the jack.
Re-enable the TN and wait for an OVD message.
If you do not receive an OVD message, replace the telephone.
If you receive an OVD message, reconnect the wiring and go to the
next possible cause.
January 1999
—continued—