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\
/
NPE 0
❘
❘
❘
T.3
R.3
PORT
TXT.3
CIRCUIT
TXR .3
3
PXT .3
T.4
R.4
PORT
TXT .4
CIRCUIT TXR.4
4
PXT.4
PXR.4
❘
❘
T.7
R.7
PORT
TXT.7
CIRCUIT
TXR .7
7
PXT.7
●
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DATA
TRANSCEIVER
PROTOCOL
HANDLER
●
ELECTRONIC
POWER FEED
ON-BOARD
MICROPROCESSOR
ON-BOARD
MICROPROCESSOR
/
PXR.1
PORT
CIRCUIT
o
ANALOG
PORT
CODEC
HYBRID
ISOLATION
TRANSFORMER
T.O
R.O
TXT. O
TXR. O
PXT.0
PXR.0
PXT.1
\
/
●
\
●
●
PXR.3
●
/
NPE 1
●
●
\
TO
MULTILINE
VOICE
TERMINALS
❘
PXR.7
/
Figure 3-11. Unique ATL Line (ZTN79) Circuitry
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