Nortel Meridian 1 Manual page 68

Page 56 of 224 Telephones
Table 10
M2317 trouble-locating procedures (Part 2 of 2)
ISDLC failure
1 Go to the system maintenance terminal (TTY or CRT) and check for displayed error
and location codes. An "NWS 401 L S C" or an "NWS 501 L S C U" code indicates that
the automatic (routine) diagnostic test has detected a fault.
Check for the following indications:
L = faulty circuit card (ISDLC card) loop number
S = circuit card location (shelf number)
C = number of the faulty circuit card
U = unit number of a faulty telephone (appears only in conjunction with the NWS 501
code)
2 Replace the faulty components.
Try to establish a call. If unsuccessful, check the telephone.
Telephone (voice or dialing) failure
1 Check the line cord and handset cord to determine if all TELADAPT connectors are
firmly in place and reconnect the loose ones. Ensure that the polarity of the Tip and
Ring leads is correct.
Lift the handset and listen for the dial tone and/or dial a directory number. If
unsuccessful, proceed with step 2.
2 Wiggle the line cord and/or handset cord while listening for sounds from the handset. If
crackling or ticking sounds are heard, replace the cords.
Try to establish a call. If unsuccessful, proceed with step 3.
3 Replace the telephone.
Try to establish a call. If unsuccessful, proceed with step 4.
4 Check the wiring between the line card, distribution panel, and telephone for breaks or
loose connections. If necessary, rerun the wiring.
Operate the telephone.
Note: If no error codes are shown at the maintenance terminal, the Network and Signaling Diagnostic
(LD 30) can be loaded and run manually from the system TTY. Refer to the X11 input/output guide
(553-3001-400).
553-3001-215 Standard 10.00 June 1999