
SDM-650B Satellite Modem Configuration
Rev. 5 3–29
Table 3-5. G.703 2048 kbit/s Interface Connector Jumpers
Switch J3 (EXT REF) J4 (SEND DATA) J5 (RECEIVE DATA)
BAL UNBAL BAL UNBAL BAL UNBAL
SW1-1 ON ON X X X X
SW1-2 OFF OFF X X X X
SW1-3 X X ON ON X X
SW1-4 X X OFF OFF X X
SW1-5 X X X X ON ON
SW1-6 X X X X OFF OFF
Switch Positions
0 CLOSED
1 OPEN
X DON’T CARE
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.
R1
J3
RECEIVE
DATA
R2
-
-
-
-
-
-
-
R3
J5
EXTERNAL
REFERENCE
CONNECTOR DB15S
-
-
-
-
-
-
-
-
-
-
-
-
Figure 3-11. G.703 2048 kbit/s Connector Board Schematic Diagram
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