NEC SV8500 Operation And Maintenance Manual - page 649
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CHAPTER 5
Operation Procedure for System with PIR
3.1.6
When Call Cannot Be Answered and Speech Cannot Be Made
Note:
If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used
until the replacement is complete.
(1) Check the faulty line on the MDF.
(a) Isolate the faulty line to the in-house wiring side and to the system side.
(b) Connect the test telephone to the system side.
(c) Call the faulty line by station-to-station calling.
[When speech can be made.]
•
Replace the telephone set with a spare.
[When speech cannot be made.]
•
Replace the LC circuit card with a spare.