VEGA Phoenix PSI Data Fax Modem - Manual (Page 41)

Hardware Installation
692302 3-9
3.3.1 Block Diagram
Figure 3-5 Block diagram
i n -
i n +
E E P R O M
µ C
3
2
7
8
6
4
5
T x D
R x D
R T S
C T S
D S R
D T R
R I
G N D
9
1 D C D
R
S
-2
32
U
P i n 2
P i n 3
P i n 4
P i n 5
a 2
a
b
b 2
b
a
n . c .
D 9 - S U B
R e s e t
A L R
R J 1 2
P
ho
ne
L
in
e
In
pu
t
O
ut
pu
t
4 x C O M B I C O N
B
ac
kp
la
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B
ac
kp
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U
0 V
2 4 V
2 4 V
5 V
- +
6 9 2 3 A 0 3 4