NEC SV8500 Operation And Maintenance Manual - page 717
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CHAPTER 5
Operation Procedure for System with PIR
5.5.4
Circuit Card Initialization Procedure
Circuit Card Initialization procedure for LINE/TRUNK circuit card is as follows.
(1) Turn the MB switch of circuit card to ON (upward).
(2) Turn back down the circuit card to OFF (downward) and confirm that MB lamp light green.
Note:
When initialization is executed, all calls using that circuit card will be disconnected and all channels will
be make-busy state.