Mil-Std-188 Interface (J8) - Comtech EF Data SDM-9000 Installation And Operation Manual

SDM-9000 Satellite Modem

2.4.8.4 MIL-STD-188 Interface (J8)

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