NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
<<For Single Configuration>>
(1) Check to see if fault occurs by replacing TSW circuit cards.
(a) Replace the TSW circuit card by referring to Replacement Procedure of TSW (Time Division Switch)
Circuit Card.
(b) Check to see if a station-to-station connection can be set up and identify a TSW circuit card responsi-
ble for the fault.
(c) 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
Card .
(b) Check to see if a station-to-station connection can be set up and identify a TSW circuit card responsi-
ble for the fault.
(c) Perform the above check by extracting the MUX circuit cards individually.