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M&C and Interfaces
4.2.2.8 Drop & Insert Interface Connector Pinouts
The D&I interface is provided on a 50 pin female "D" connector accessible from the rear
panel of the modem. Screw locks are provided for mechanical security of the mating
connector.
GROUND
DROP DATA INPUT
DROP DATA OUTPUT
INSERT DATA INPUT
INSERT DATA OUTPUT
REFERENCE CLOCK
(RS-422) IN
TX RS-232 DATA
RX RS-232 DATA
RS-232 DATA SET READY
PRIMARY FAULT RELAY
SECONDARY FAULT RELAY
MODULATOR FAULT
DEMODULATOR FAULT
RESERVED
Notes:
1. ALARM Relay contacts named for normal No Fault condition (xx-COM
2. SIGNALS MF,DF, and DMA are Open Collector High Impedance if Faulted.
4.2.2.9 Drop & Insert Interface Specification
Terrestrial Data Rates Supported
Terrestrial Framing Supported
Primary Data Circuits Supported
4-4–32
Signal Function
connected to xx-NC if no fault).
MF and DF are used by SMS-658 M/N backup switch if used in redundant
system.
Name
GND
1,2
DSD-A
34
DSD-B
18
DRD-A
37
DRD-B
38
ISD-A
39
ISD-B
40
IRD-A
36
IRD-B
20
EXC-A
35
EXC-B
19
TERESTXDAT
5
TERESRXDAT
7
DSR
48
PRI-COM
10 (Note 1)
PRI-NC
27
PRI-NO
43
SEC-COM
11 (Note 1)
SEC-NC
28
SEC-NO
44
MF
49 (Note 2)
DF
33 (Note 2)
3
1544 Kb/s per G.703
2048 Kb/s per G.703
G.732/G.733, G.704
T1 DSD,DRD,ISD,IRD
E1 DSD,DRD,ISD,IRD
SDM-309B Satellite Modem
Pin Number
MN/U-SDM309B Rev. #
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