A SERVICE OF

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PORT CIRCUIT
NPE
1
1
PORT
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CIRCUIT 7
PORT CIRCUIT
4
RAM
PORT CIRCUIT
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5
ON-BOARD
PORT
SAKI
MICRO-
I/O
PROCESSOR
CIRCUIT
PORT CIRCUIT
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NPE
PORT
TDM
BUS
LEADS
BUS
BUFFERS
0
CIRCUIT 3
CIRCUIT
PACK
ADDRESS
LEADS
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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