Making A Power Failure Station Connection
Every loop start line board provides a tip and ring pair connected to line 1 as an emergency power failure circuit.
This power fail circuit is active during a commercial AC power failure if an external battery assembly is not
installed to provide battery back-up power to the system. Connect an industry standard, single-line telephone to
the power failure jack and use it to provide basic communications capability until the AC power to the system is
restored. Pair 25 (pin numbers 50 and 25, clip terminals 49 and 50) on the line board connector jack provides the
power failure connection.
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Power Failure Terminals on
Line Board Connection Block
Pair 25,
Pins 50 and 25,
Clip Terminals 49 and 50
Typical Industry Standard
Non-electronic Telephone
(Power Failure Interface)
pwr_fail.cdr
Making A Power Failure Station Connection
Installing The Loop Start Line Board
IMI89–266
Making A Power Failure Station Connection – 9
