Comtech EF Data SDM-9000 User Manual
Page 55
SDM-9000 Satellite Modem
Installation
Rev. 4
2–13
2.4.8.4 MIL-STD-188 Interface (J8)
Signal Function
Name
Pin #
Ground
GND
1, 2
Send data input
TXD–A
37
TXD–B
38
Terrestrial timing input (TT)
TXO–A
4
TXO–B
5
Request to send input (RTS)
SD–A
34
SD–B
18
Send timing output (ST)
TXC–A
21
TXC–B
22
Receive data output (RD)
RXD–A
39
RXD–B
40
Receive timing output (RT)
RXC–A
23
RXC–B
24
Data mode output (DM/DSR)
RD–A
36
RD–B
20
External clock input (EXC)
EXC-
35
EXC+
19
Receiver ready output (RR/RLSD)
RXO–A
6
RXO–B
7
ADPCM 1 audio input
A1I–A
45
A1I–B
29
ADPCM 1 audio output
A1O–A
46
A1O–B
30
ADPCM 2 audio input
A2I–A
47
A2I–B
31
ADPCM 2 audio output
A2O–A
48
A2O–B
32
Backward alarm 1 output
BWO1–C
8
(Note 1)
BWO1–NC
25
BWO1–NO
41
Backward alarm 2 output
BWO2–C
9
(Note 1)
BWO2–NC
26
BWO2–NO
42
Backward alarm 3 output
BWO3–C
10
(Note 1)
BWO3–NC
27
BWO3–NO
43
Backward alarm 4 output
BWO4–C
11
(Note 1)
BWO4–NC
28
BWO4–NO
44
Backward alarm 1 input
BWI1
12
(Note 2)
Backward alarm 2 input
BWI2
13
(Note 2)
Backward alarm 3 input
BWI3
14
(Note 2)
Backward alarm 4 input
BWI4
15
(Note 2)
Modulator fault (TTL)
MF
49
(Note 3)
Demodulator fault (TTL)
DF
33
(Note 3)
Deferred maintenance alarm
DMA
17
(Note 3)
Demodulator fault relay
DF–C
16
(Note 4)
DF–NO
50
AGC output (receive input, if level)
AGC–OUT
3