Specifications

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