NEC Univerge SV8500 Operation And Maintenance Manual page 703

CHAPTER 5 Operation Procedure for System with PIR
(c) On DTI cards, set MB switch DOWN. On CCH card, set MBR switch DOWN.
(d) Check whether the fault is still indicated.
(2) Check by replacing the DTI card with spare.
(a) On DTI card, set MB switch UP and extract the card from the mounting slot.
(b) On a new DTI card, make the switch setting.
(c) On new DTI card, set MB switch UP and insert the card into the mounting slot.
(d) On new DTI card, set MB switch DOWN.
(e) Check whether the fault is still indicated.
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