A SERVICE OF

logo

\
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
/
3-19