Comtech EF Data SDM-2020 - Manual (Page 130)

SDM-2020 Satellite Demodulator Revision 4
RS-422 Data Interface MN/SDM2020D.IOM
7–4
7.3 Configuration
Note: The jumper location on the interface card is shown in Figure 7-1.
A single jumper provides the option for a transmit or receive reference clock on
connector J3 (pins 2 and 15). The pins are configured at the factory as signal ground per
TM 1449. An SCT output is required in conjunction with using the DVB Data port (J3).
SCT may be jumped to pins 2 and 15, thus providing all signals on a single connector.
The same jumper configuration in the demodulator applications provides for a Master
clock input. Alternatively, SCT and Master clock interconnects are available on the
Auxiliary port (J5).
DVB
CONFIGURATION
(FACTORY SETTING)
J3
D
V
B
P
A
R
A
LL
EL
/S
ERIA
L
J4
E
IA-53
0
SE
RIAL
J5
AUX
J3 - 2 & 15 GND
NOTE:
JUMPER SELECTS FOR
PINS 2 & 15 OF THE J3
DVB PARALLEL/SERIAL
REAR PANEL CONNECTOR
Figure 7-1. RS-422 Interface Module PCB