Connecting A Power Failure Station - Comdial DSU II System Manual

IMI66–132
2.7

Connecting A Power Failure Station

The system provides a tip and ring pair connected to line 1 as an emergency power failure
circuit. This 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, such as a model 2500, to a power failure pair and use it to
provide communications capability until the AC power to the system is restored.
NOTE: The system also provides one power failure connection with each add-on expansion
module.
Typical Industry Standard
Non-electronic Telephone
(Power Failure Interface)
Typical Industry Standard
Non-electronic Telephone
(Power Failure Interface)
2 – 28 Installing The DSU II Digital Telephone System
Power Failure Terminals on
(4-Line, 8-Station and 8-Line, 16-Station Base Units)
Making A Power Failure Connection
DSU II Digital Telephone System
Station Connection Block
37
38
39
40
41
42
43
44
45
46
47
48
49
50
1 2 3 4 5 6
Power Failure Jack (pins 3 & 4)
(16-Line, 32-Station Base Unit)
DSU221
Pin 3 = Power Failure Tip
Pin 4 = Power Failure Ring