SMS-758 Modem Protection Switch
Theory of Operation
MN/SMS758 Rev. 3
4–17
4.6.2.2 Connector Pinouts
The V.35 interface is an industry standard 34-pin block connector.
Screw locks provide mechanical security for the mating connector.
Signal Function
Name
Pin #
Signal Ground
SG
A,B
Transmit Data
SD-A
P
SD-B
S
Serial Clock Transmit
SCT-A
Y
SCT-B
a (AA)
Receive Data
RD-A
R
RD-B
T
Request To Send
RTS
C
Serial Clock Receive
SCR-A
V
SCR-B
X
Clear To Send
CTS
D
Data Set Ready
DSR
E
Rcv. Line Signal Det.
RLSD
F
Serial Clock Transmit Ext
SCTE-A
U
SCTE-B
W
Master Clock
MC-A
c (CC)
MC-B
d (DD)
Modulator Fault
MF
m (MM)
Demodulator Fault
DF
n (NN)
Note: MF and DF inputs are only on the prime and backup modem interface connectors,
not the terrestrial data connector.
