Comtech EF Data SMS-758 - Manual (Page 82)

Theory of Operation SMS-758 Modem Protection Switch
4–22 MN/SMS758 Rev. 3
4.6.3.2 Connector Pinouts
4.6.3.2.1 V.35 Option
The V.35 interface has been converted from the 34-pin block connector (refer to
Figure 4-4) to a 25-pin D connector (refer to Figure 4-6) that is accessible from the back
panel. Screw locks are provided for mechanical security of the mating connector.
Pin #
(25-Pin)
Pin #
(34-Pin Block)
Signal Name
1 A Ground
7 B Ground
14 P Send Data A
2 S Send Data B
25 U Serial Clock Transmit External A
24 W Serial Clock Transmit External B
18 Y Serial Clock Transmit A
15 a (AA) Serial Clock Transmit B
16 R Receive Data A
3 T Receive Data B
19 V Serial Clock Receive A
17 X Serial Clock Receive B
4 C Request to Send
5 D Clear to Send
6 E Data Set Ready
8 F Receive Line Signal Detect
22 c (CC) External Reference Clock A
23 d (DD) External Reference Clock B
20 m (MM) Modulator fault
21 n (NN) Demodulator fault
9, 10, 11, 12, and 13 No connection in 25-pin
connector
H, J, M, N, Z, b (BB),
e (EE), f (FF), h (HH),
j (JJ), k (KK), and l (LL) No connection in 34-pin block