Line Fault - When Bell Does Not Ring - NEC Univerge SV8500 Operation And Maintenance Manual

3.1.5

Line Fault - When Bell Does Not Ring

If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used
Note:
until the replacement is complete.
(1) Call the faulty station line by station-to-station calling and check to see if the bell of the telephone rings.
(a) Replace the telephone set and check to see if its bell rings.
(2) 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 and check to see if the bell rings.
[When the bell does not ring]
• Replace the LC circuit card with a spare.
[When the bell rings]
• The in-house wiring side is faulty. Confirm that the A-wire is not short-circulating with ground.
CHAPTER 5 Operation Procedure for System with PIR
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