Specifications

Theory of Operation
160 025-9035AA
Central Office DID (Selector Level)
Central Office
Central Office draws
current from Tip-Ring
telephone wires
Idle Condition provides -
battery on Ring, + battery
on Tip
Turn Loop
Light on
Wink Start?
Momentarrily
reverse 48V
polarity
Flash
Answer
Light
Yes
Central Office sends
DTMF or MF
Accept feed digits from
Central Office
Pulse Digits?
DTMF?
Flash Loop
Light
Flash
Test 1
Test 2
Subscriber Number
Trunk Prefix +
feed digits
Check
Subscriber
Number
Check
Subscriber
Number
Normal Battery on
Tip-Ring
Answer and
Loop lights off