Comtech EF Data SDM-300A, Installation And Operation Manual

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SDM-300A Satellite Modem Options
Rev. 4 A–85
A.3.4.2 Pin Assignment
Refer to Table A-26 for 50-pin connector pin assignments.
Table A-26. 50-Pin Connector Pin Assignments
IDR IBS D&I DB50 DB37 DB15** DB25 DB9*** V.35
GND GND GND 1, 2 1,19, 2,4 1,7 3 A
20,37 B
AGC–OUT AGC–OUT AGC–OUT 3
SD–A G.703 SD–A DDI–A 34
SD–B G.703 SD–B DDI–B 18
EXC–A EXC/MC-A**** EXC–A 35 15 (16) 20 CC
EXC–B EXC/MC-B EXC–B 19 33 (34) 23 DD
RD–A G.703 RD–A IDO–A 36
RD–B G.703 RD–B IDO–B 20
TXO–B ESC–TXD–A ESC–TXD–A 5
TXO–A ESC–TXD–B ESC–TXD–B 4
TXD–A SD–A *DDO–A 37 4 1 2 1 P
TXD–B SD–B *DDO–B 38 22 9 14 6 S
RXO–B ESC–RXD–A ESC–RXD–A 7
RXO–A ESC–RXD–B ESC–RXD–B 6
RXD–A RD–A *IDI–A 39 6 3 3 9 R
RXD–B RD–B *IDI–B 40 24 11 16 5 T
RXC–A SCR/RT–A 23 8 17 2 V
RXC–B SCR/RT–B 24 26 9 7 X
A1I–A RTS–A 45 7 4 C
A1I–B RTS–B 29 25 19
A1O–A RLSD/RR–A 46 13 8 F
A1O–B RR–B 30 31 10
A2I–A CTS–A 47 9 5 D
A2I–B CTS–B 31 27 13
A2O–A DSR/DM–A 48 11 6 E
A2O–B DM–B 32 29 22
TXC–A SCT/ST–A 21 5 15 8 Y
TXC–B SCT/ST–B 22 23 12 4 AA
BWI–1 SCTE/TT–A 12 17 24 U
BWI–2 SCTE/TT–B 13 35 11 W
BWI–3 RS422TXO–A 14
BWI–4 RS422TXO–B 15
BWO1–C RS422RXO–A**** 8 16
BWO2–C RS422RXO–B 9 34
BWO1–NO TER–ESC–DSR TER–ESC–DSR 41
BWO2–NO 42
BWO2–NC RXCK RXCK 26
BWO1–NC TXCK TXCK 25
BWO3–C PRI–COM PRI–COM 10
BWO3–NO PRI–NO PRI–NO 43
BWO3–NC PRI–NC PRI–NC 27
BWO4–C SEC–COM SEC–COM 11
BWO4–NO SEC–NO SEC–NO 44
BWO4–NC SEC–NC SEC–NC 28
MOD–FLT MOD–FLT MOD–FLT 49 3 14 25 MM
DMD–FLT DMD–FLT DMD–FLT 33 21 15 21 NN
DF–COM 16
DF–NO 50
DMA 17
* Tie IDI to DDO for normal D&I operation.
** Used with the SMS-301 1:1 Switch when using the DB37 switch interface for G.703 operation.
*** Used for the SDM-300 and SDM-9000 64K overhead data channel on the audio connector of the UB-300
break out panel.
**** Pins 15 and 33 on the DB37 connector on the UB-300 breakout panel is used for external clock applications.
Modems that do not use a breakout panel but have a DB37 connector have external clock on pins 16 and 34.