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NPE O
●
NPE 1
❘
❘
❘
ON-BOARD
MICROPROCESSOR
PORT
CIRCUIT
o
CODEC
HYBRID
PORT
I/O
CIRCUIT
T.O
R.O
T.3
PORT
CIRCUIT
3
R.3
●
●
T.4
●
PORT
●
CIRCUIT
●
4
R.4
❘
●
❘
❘
T.7
PORT
CIRCUIT
7
R.7
Figure 3-9. Unique Loop Start Trunk (ZTN77) Circuitry
TO
CENTRAL
OFFICE
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3-19