Specifications

SDM-650B Satellite Modem Asynchronous Overhead Channel Unit
Rev. 5 F–5
JP4
1
12
J
P11
A
S/1311 REV
JP5
1
JP6 JP7
JP8
1
JP13
1
JP10
1
1
11
1
JP12
JP9
J
P
3
2
1
A
SYNC OVERHEAD TERRESTRIAL INTERFACE BOARD
JP1 JP2
1
2
1
Figure F-2. Asynchronous Overhead Interface Board
Table F-1. Asynchronous Overhead Jumpers
JP # Pin # Function
JP1 1 to 3, and 2 to 4
3 to 5, and 4 to 6
V.35, RS-422, MIL-STD-188
G.703
JP2 1 to 2
3 to 4
5 to 6
Auto TX CLK Phase Select
Fixed Phase, Normal
Fixed Phase, Inverted
JP3 1 to 2
2 to 3
G.703 data activity detect
TX Terr CLK activity detect
JP10 1 to 2
2 to 3
V.35 operation
RS-422, MIL-STD-188 operation
JP11 1 to 2
3 to 4
Normal SCT output
TX CLK “chained” to SCT output
JP12 1 to 2
2 to 3
2-wire operation
4-wire operation
Asynchronous
JP8, JP9, JP13 1 to 2
2 to 3
RS-485
RS-232-C
Table F-2. Data Rate Jumpers
Data Rate Impedance JP4 JP5 JP6 JP7 Voltage
1.544 Mbit/s
BAL−100
OFF ON ON OFF 5.8 Vp-p
2.048 Mbit/s
BAL−120
OFF ON ON OFF 5.8 Vp-p
2.048 Mbit/s
UNBAL−75
OFF ON ON OFF 4.6 Vp-p
6.312 Mbit/s
BAL−110
1 to 2 OFF OFF OFF 1.8 Vp-p
6.312 Mbit/s
UNBAL−75
OFF OFF OFF OFF 3.3 Vp-p
8.448 Mbit/s
UNBAL−75
OFF ON ON OFF 4.8 Vp-p