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SDM-300A Satellite Modem
A.3.4.2
Pin Assignment
Refer to Table A-26 for 50-pin connector pin assignments.
IDR
GND
GND
AGC–OUT
AGC–OUT
SD–A
G.703 SD–A
SD–B
G.703 SD–B
EXC–A
EXC/MC-A****
EXC–B
EXC/MC-B
RD–A
G.703 RD–A
RD–B
G.703 RD–B
TXO–B
ESC–TXD–A
TXO–A
ESC–TXD–B
TXD–A
SD–A
TXD–B
SD–B
RXO–B
ESC–RXD–A
RXO–A
ESC–RXD–B
RXD–A
RD–A
RXD–B
RD–B
RXC–A
SCR/RT–A
RXC–B
SCR/RT–B
A1I–A
RTS–A
A1I–B
RTS–B
A1O–A
RLSD/RR–A
A1O–B
RR–B
A2I–A
CTS–A
A2I–B
CTS–B
A2O–A
DSR/DM–A
A2O–B
DM–B
TXC–A
SCT/ST–A
TXC–B
SCT/ST–B
BWI–1
SCTE/TT–A
BWI–2
SCTE/TT–B
BWI–3
RS422TXO–A
BWI–4
RS422TXO–B
BWO1–C
RS422RXO–A****
BWO2–C
RS422RXO–B
BWO1–NO
TER–ESC–DSR
BWO2–NO
BWO2–NC
RXCK
BWO1–NC
TXCK
BWO3–C
PRI–COM
BWO3–NO
PRI–NO
BWO3–NC
PRI–NC
BWO4–C
SEC–COM
BWO4–NO
SEC–NO
BWO4–NC
SEC–NC
MOD–FLT
MOD–FLT
DMD–FLT
DMD–FLT
DF–COM
DF–NO
DMA
*
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.
Rev. 4
Table A-26. 50-Pin Connector Pin Assignments
IBS
D&I
GND
AGC–OUT
DDI–A
DDI–B
EXC–A
EXC–B
IDO–A
IDO–B
ESC–TXD–A
ESC–TXD–B
*DDO–A
*DDO–B
ESC–RXD–A
ESC–RXD–B
*IDI–A
*IDI–B
TER–ESC–DSR
RXCK
TXCK
PRI–COM
PRI–NO
PRI–NC
SEC–COM
SEC–NO
SEC–NC
MOD–FLT
DMD–FLT
DB50
DB37
DB15**
1, 2
1,19,
2,4
20,37
3
34
18
35
15 (16)
19
33 (34)
36
20
5
4
37
4
1
38
22
9
7
6
39
6
3
40
24
11
23
8
24
26
45
7
29
25
46
13
30
31
47
9
31
27
48
11
32
29
21
5
22
23
12
17
13
35
14
15
8
16
9
34
41
42
26
25
10
43
27
11
44
28
49
3
14
33
21
15
16
50
17
Options
DB25
DB9***
V.35
1,7
3
A
B
20
CC
23
DD
2
1
P
14
6
S
3
9
R
16
5
T
17
2
V
9
7
X
4
C
19
8
F
10
5
D
13
6
E
22
15
8
Y
12
4
AA
24
U
11
W
25
MM
21
NN
A–85
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