NEC SV8500 Operation And Maintenance Manual - page 678
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CHAPTER 5
Operation Procedure for System with PIR
4.5.2
Speech Path System Fault - Fault Related to Speech
Faulty Situation:
•
Fault related to speech such as noise, one-way speech, no-speed, etc. occurs.
•
Even if dialing is made, Dial Tone (DT) does not stop.
•
[
] Both TSW Write Failure
•
[
] TSW Write Failure
<
(1) Check to see if fault occurs by replacing TSW circuit cards one by one.
(a) Replace the TSW circuit card by referring to
Replacement Procedure of TSW (Time Division Switch)
(b) Place the TSW circuit card in ACT mode. Refer to
in Chapter 2.
(c) Check to see if a station-to-station connection can be set up and identify a TSW circuit card responsi-
ble for the fault.
(d) Perform the above check by extracting the TSW circuit cards individually.
(2) Check to see if fault occurs by replacing MUX circuit cards one by one.
(a) Replace the MUX circuit card by referring to
Replacement Procedure of MUX (Multiplexer) Circuit
(b) Place the MUX circuit card to ACT mode. Refer to
How to Control Switching Block
(c) Check to see if a station-to-station connection can be set up and identify a circuit card responsible for
the fault.
(d) Perform the above check by extracting the MUX circuit cards individually