Power Failure Transfer (4Coidb-B1 Only); General - NEC SL1100 Hardware Manual

ISSUE 1.0 SL1100
3.5

Power Failure Transfer (4COIDB-B1 only)

3.5.1

General

In the event of AC power failure, the specified trunk is directly connected to the specified extension port
as below. And SLT must be connected to the specified extension. The multiline telephone (2W) does
not work when the specified trunk is connected to the specified extension port.
J2 (CO1-4): Trunk Port 1 J3 (PF1): Extension Port 1
Refer to RJ-61 CO/PF Pin-Outs (J2, J3) for wiring of the power failure telephone.
The connected extension must be SLT (Single Line Telephone).
Hardware Manual 2-49