Figure 3-11. G.703 2048 Kbit/S Connector Board Schematic Diagram; Table 3-5. G.703 2048 Kbit/S Interface Connector Jumpers - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem
Switch
The interface connects to the rear of the modem, directly onto the G.703 interface
connector. Refer to Figure 3-11 for a schematic diagram of the optional G.703
2048 kbit/s connector board.
J3
EXTERNAL
REFERENCE
R1
J4
SEND
DATA
R2
J5
RECEIVE
DATA
R3
J2
1 SD-A
9 SD-B
2
10
3
RD-A
11 RD-B
4
12
5
13
6
14 MOD FLT
7
MC-A
15 DMD FLT
8
MC-B
CONNECTOR DB15S

Figure 3-11. G.703 2048 kbit/s Connector Board Schematic Diagram

Rev. 5

Table 3-5. G.703 2048 kbit/s Interface Connector Jumpers

J3 (EXT REF)
BAL UNBAL
SW1-1 ON ON
SW1-2 OFF OFF
SW1-3 X X
SW1-4 X X
SW1-5 X X
SW1-6 X X
Switch Positions
0 CLOSED
1 OPEN
X DON'T CARE
T1
2 6
1 5
XF65502#
T2
2 6
1 5
XF65502#
T3
2 6
1 5
XF65502#
J4 (SEND DATA) J5 (RECEIVE DATA)
BAL UNBAL BAL
X X X
X X X
ON ON X
OFF OFF X
X X ON
X X OFF
S1
1 16 MC-A
2 15 MC-B
3 14 SD-A
4 13
SD-B
5 12 RD-A
6 11
RD-B
7 10
8 9
SW DIP-8
Configuration
UNBAL
X
X
X
X
ON
OFF
J1
SD-A 1
SD-B 9
2
10
3
RD-A
RD-B 11
4
12
5
13
6
MOD FLT 14
7
MC-A
DMD FLT 15
8
MC-B
CONNECTOR DB15P
3–29