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TELCO Interface Timing Diagrams
TELCO Interface Timing Diagrams
These diagrams show the relations between the various interface signals of the Trunk Card
(702-9117) and the Telco System. The names and the timing values are described in Trunk
Card OPARAM Codes on page 219. There are separate diagrams for each type of
telephone circuit configuration.
Figure 32: Central Office DID (Immediate Dial Pulse) Call Initiation and Termination
Figure 33: Central Office DID (Wink Start DTMF) Call Initiation and Termination
Figure 34: PABX Trunk (Loop Start) Call Initiation and Termination
Note WINK can be set in OPARAMS (Zetron software), 240 milliseconds
is typical.
TIP/RING
CURRENT
TIP/RING
VOLTAGE
ANSWER
IDLE
TCON
Decode
Pulsed #
TANS
Process Call
TDIS
Z-03
ON
OFF
TIP/RING
AUDIO
ON
OFF
TIP/RING
CURRENT
TIP/RING
VOLTAGE
ANSWER
IDLE
TCON
Process Call
TDIS
Z-04B
ON
OFF
TIP/RING
AUDIO
ON
OFF
WINK
Decode DTMF #
TIP/RING
CURRENT
ANSWER
IDLE
ON
OFF
TCON
Decode Pulsed #
TANS
Process Call
TDIS
Z-05
Decode DTMF
ON
OFF
TIP/RING
VOLTAGE
TIP/RING
AUDIO
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