
Theory of Operation
174 025-9035AA
Figure 35: Operator Local Phone Call Initiation and Termination
Figure 36: Central Office End-to-End and PABX Station Extension Call Initiation and
Termination
Figure 37: PABX E&M Type I Tie-Trunk Call Initiation and Termination
Figure 38: PABX End-to-End Ground Start Call Initiation and Termination
TIP/RING
CURRENT
ON
OFF
TCON
Decode DTMF #
Process Call
TDIS
Z-06
TANS
TIP/RING
VOLTAGE
TIP/RING
AUDIO
NSWER
IDLE
ON
OFF
TIP/RING
AUDIO
ON
OFF
TCON
TANS Process Call TDIS
Z-07
Decode DTMF #
TIP/RING
VOLTAGE
IDLE
SEIZED
RINGING
TIP/RING
CURRENT
ON
OFF
E FROM TEL
CURRENT
TIP/RING
AUDIO
ON
OFF
TCON
Decode Pulsed #
TANS
Process Call TDIS
Z-08
Decode DTMF #
M FROM TEL
CURRENT
ON
OFF
ON
OFF
TIP/RING
AUDIO
ON
OFF
TCON
Decode Pulsed #
TANS
Process Call
TDIS
Z-09
Decode DTMF #
TIP/RING
CURRENT
RING
CURRENT
ON
OFF
ON
OFF
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