NEC SV8500 Operation And Maintenance Manual - page 709
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CHAPTER 5
Operation Procedure for System with PIR
Figure 5-29 Recovery Procedure From Lockout Station (2 of 2)
COMMAND
COMMAND FULL NAME
A
RLST command
(Confirm: DT)
Hear DT?
Replace 16LC card
with a spare.
Circuit may be faulty temporarily.
Observe situation for a while.
Forcibly release the lockout station circuit.
Go off-hook again and confirm DT.
YES
NO