NEC SV8500 Operation And Maintenance Manual - page 708
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CHAPTER 5
Operation Procedure for System with PIR
5.2
Recovery Procedure
Figure 5-29 Recovery Procedure From Lockout Station (1 of 2)
Confirm the state of the handset of
the displayed station.
On the MDF, connect the test
telephone to the displayed station
and confirm Dial Tone (DT).
Here DT?
A
The in-house wiring (from the MDF to
the lockout station) is shorting.
Check the wiring.
Go on-hook and then go off-hook again.
LOCKOUT STATION
SEPARATING
MDF
System
TEST TEL.
If dial tone is heard, the station is in permanent
signaling status.
YES
NO