
Theory of Operation
162 025-9035AA
End-to-End Ground Start (PABX Trunk)
Ground Start
PABX grounds
Ring line
Loop light
turns on
Terminal detects
ground and
provides 48V
Turn on
Answer Light
PABX detects 48V
and connects Tip
to Telco ground
Terminal detects current,
waits programmed delay
for audio cut through
Voice
Prompt
Send Beep
Play Overdial
Voice Prompt
YesNo
Accept overdial
from caller
Pulse
Digits?
DTMF?
Flash Loop
Light
Flash Test 1,
Test 2
Subscriber number
Trunk prefix +
feed digits
Check
Subscriber
Number
End
Page
Normal battery
on Tip-Ring
Answer and
Loop lights
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