Comtech EF Data SDM-650B - Manual (Page 71)

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.
1
2
5
6
T1
XF65502#
R1
J3
RECEIVE
DATA
J4
SEND
DATA
R2 1
2
5
6 T2
XF65502#
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S1
SW DIP-8
SD-A
SD-B
MC-A
MC-B
RD-A
RD-B
1
2
5
6
T3
XF65502#
R3
J5
EXTERNAL
REFERENCE
8
15
7
14
6
13
5
12
4
11
3
10
2
9
1
J2
CONNECTOR DB15S
MC-A
MOD FLT
RD-B
RD-A
SD-A
SD-B
MC-A
MOD FLT
RD-B
RD-A
SD-A
SD-B
8
15
7
14
6
13
5
12
4
11
3
10
2
9
1
J1
CONNECTOR DB15P
MC-B
DMD FLT
MC-B
DMD FLT
Figure 3-11. G.703 2048 kbit/s Connector Board Schematic Diagram