AT&T AT&T Figure 3-15. Unique DID Trunk (TN753) Circuitry, 3-31

\
NPE O
NPE 1
ON-BOARD
MICROPROCESSOR
PORT
CIRCUIT
0
TRUNK
INTERFACE
UNIT
T.O
CODEC HYBRID
R.O
●
❘
❘❘
PORT
PORT
T.3
CIRCUIT
3
R.3
I/O
● ●
CIRCUIT
●
●
●
PORT T.4
CIRCUIT
4
R.4
●
●
❘❘
❘
PORT T.7
CIRCUIT
7
R.7
TO
CENTRAL
OFFICE
/
Figure 3-15. Unique DID Trunk (TN753) Circuitry
3-31