AT&T AT&T manual Unique Data Line TN726 Circuitry

A

/	●
NPE
0
	●
\	A
	●
	●
ON-BOARD	●
MICROPROCESSOR	A
	●
/	●
	●
NPE
BUS
1	●
ISOLATION	A
\	●
	●
	A
	●
	●
	●
	A
	●
	●
BIT	●
	●
CLOCK
	A
	●
	●
	A

PORT

CIRCUIT 0

ASYNCHRONOUS

PROTOCOL

DATA

HANDLER

UNIT

(OATMEAL)

(ADU)

PORT

CIRCUIT

1

PORT

CIRCUIT

2

PORT

CIRCUIT 3

PORT

CIRCUIT

4

PORT

CIRCUIT 5

PORT

CIRCUIT

6

PORT

CIRCUIT 7

PXT.O

PXR.0

TXT.0

TXR.0

PXT.7

PXR.7

TXT.7

TXR.7

\

TO

ADUs

/

Figure 3-12. Unique Data Line (TN726) Circuitry

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