Comtech EF Data SDM-650B - Manual (Page 263)

SDM-650B Satellite Modem Asynchronous Overhead Channel Unit
Rev. 5 F–5
JP4 1
1 2
JP11
AS/1311 REV
JP5
1
JP6 JP7
JP8
1
JP13
1
JP10 1 1
1 1
1
JP12 JP9
JP3
2
1
ASYNC 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