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Page 366 of 504 Appendix B: Meridian Modular Telephones installation
553-3001-367 Standard 3.00 August 2005
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.
Table 62
M2317 trouble-locating procedures (Part 2 of 3)
Step Action