Specifications

SDM-309B Satellite Modem M&C and Interfaces
MN/U-SDM309B Rev. # 4-4–19
4.2.1.9.1 IBS Terrestrial Interface (J1)
The IBS terrestrial interface is provided on a 50 pin female "D" connector accessible
from the rear of the breakout panel. Screw locks are provided for mechanical security of
the mating connector.
Signal Function Name Pin Number
GROUND GND 1,2
T1E1 SEND DATA T1E1_SD-A
T1E1_SD-B
34
18
EXTERNAL CLOCK EXC-A
EXC-B
35
19
T1E1 RECEIVE DATA T1E1_RD-A
T1E1_RD-B
36
20
TERRESTRIAL TX DATA TXD 5
SEND DATA SD-A
SD-B
37
38
SERIAL CLOCK TX/SEND TIMING SCT/ST-A
SCT/ST-B
21
22
TERRESTRIAL RX DATA RXD 7
RECEIVE DATA RD-A
RD-B
39
40
SERIAL CLOCK RX/RECEIVER TIMING SCR/RT-A
SCR/RT-B
23
24
RS422 RX OCTET RS422RXO-A
RS422RXO-B
8
9
SERIAL CLOCK TX EXT./TERMINAL
TIMING
SCTE/TT-A
SCTE/TT-B
12
13
REQUEST TO SEND RTS-A
RTS-B
45
29
RECEIVE LINE SIGNAL
DETECT/RECEIVER READY
RLSD/RR-A
RR-B
46
30
RS422 TX OCTET RS422TXO-A
RS422TXO-B
14
15
CLEAR TO SEND CTS-A
CTS-B
47
31
DATA SET READY/DATA MODE DSR/DM-A
DM-B
48
32
TERRESTRIAL ESC DATA SET READY TER_ESC_DSR 41
PRIMARY ALARM PRI_COM
PRI_NO
PRI_NC
10
43
27
SECONDARY ALARM SEC_COM
SEC_NO
SEC_NC
11
44
28
4.2.1.9.2 RS422 Interface (J2)
The RS422 interface is provided on a 37 pin female “D” connector accessible from the
front of the break-out panel. Screw locks are provided for mechanical security of the
mating connector.
Signal Function Name Pin Number