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SYNCHRONOUS MODEM ELIMINATORS SME–422, –V.35, –530, –X.21
Figure 3-1. SME–422 and SME–X.21 Printed-Circuit-Board Layout.
PWR
CTS
TXD
DCD
RTS
RXD
1
5
P1
J1
J2
W3
W2
W1
1
W4
W5
W10
W8
W7
W9
S2
S1
OFF
6 5 4 3 2 1
A
B
C
INT
RCVD
EXT
W6
C B
A
OFF
6 5 4 3 2 1
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
INT
RCVD
EXT
1
A
B
C
A
B
C
W1
Low-voltage
AC Power
DB37
Connector
Data-Rate
Switches
Ribbon
from DB37
Connector
Common
Ground
Tie Point
Rack
Power
FRONT
REAR