Comtech EF Data SDM-2020 - Manual (Page 144)

SDM-2020 Satellite Demodulator Revision 4
LVDS Data Interface MN/SDM2020D.IOM
8–8
8.1.4.2.1 Connector Pinout, J5
The connector is a sub-miniature, 9-pin D female, with threaded jack nuts (refer to
Table 8-4 for connector pinout).
Differential pairs are LVDS compatible.
Note: The sense of differential signal pairs is a logic “1” when “B” is positive with
respect to “A.”
Single ended signals are open collector where:
V
oh
=12V max. And V
ol
=0.5V max. @ I
ol
=8 ma.
A pull-up resistor, external to the equipment, is required.
The fault signals, MF and DF, operate as follows: A fault is indicated by an “OFF”
collector (high) and OK status is indicated by an “ON” collector (low).
Table 8-4. Auxiliary Connector Pinout
Pin # Signal Function Name Type Comment
1 GND Signal Ground
2 Demodulator Fault
Indicator
DF O Demodulator Summary Fault
Redundancy switch application
3 Send Timing ST-A O Modulator
SCT for terrestrial
synchronization
4 N/C
5 Not Used
6 Modulator Fault Indicator MF O Modulator Summary Fault
Redundancy switch application
7 Carrier Detect /CD O Demodulator
8 Send Timing ST-B O Modulator
SCT for terrestrial
synchronization
9 Master Clock MC-A I Demodulator
8.1.5 LVDS Interface Front Panel Menus
Depending upon the installed firmware, refer to Functional Select: Utility: Interface
menu.
8.1.6 LVDS Interface Remote Commands
Refer to the applicable appendix for a listing of LVDS interface module remote control
commands.