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❘
●
❘
PORT CIRCUIT
❘
●
NPE
1
●
1
PORT
\
●
CIRCUIT 7
●
PORT CIRCUIT
4
●
●
RAM
●
PORT CIRCUIT
/
5
●
❘
ON-BOARD
PORT
❘
SAKI
●
MICRO-
I/O
●
PROCESSOR
CIRCUIT
❘
●
PORT CIRCUIT
\
/
\
\
●
NPE
PORT
TDM
BUS
LEADS
BUS
BUFFERS
0
CIRCUIT 3
CIRCUIT
PACK
ADDRESS
LEADS
/
\
LEDS
RED
PORT CIRCUIT
0
GREEN
YELLOW
2
●
SANITY
CHECK
●
CIRCUIT
PORT CIRCUIT
6
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Figure 3-20. Tone Detector (TN748) Circuit
TOUCH-TONE
PORTS
GENERAL
PURPOSE
TONE
DETECTOR
PORTS
3-42