Comtech EF Data SDM-2020 - Manual (Page 114)

SDM-2020 Satellite Modulator Revision 7
Low Voltage Differential Signal (LVDS) MN/SDM2020M.IOM
8-7
8.1.5 A
UXILIARY
, J5
This port provides for other modem-specific signals not otherwise defined on the
data connectors.
8.1.5.1 C
ONNECTOR
P
INOUT
J5
The connector is a sub-miniature, 9-pin D female, with threaded jack nuts. 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:
Voh=12V max. and Vol=0.5V max. @ Iol=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 8-3. Auxiliary Connector Pinout
Pin # Signal Function Name Type Comment
1 GND Signal Ground
2 Demod 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 Master Clock MC-B I Demodulator
6 Mod 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
8.1.6 LVDS I
NTERFACE
F
RONT
P
ANEL
M
ENUS
Refer to Chapter 5, Utility Interface menu.
8.1.7 LVDS R
EMOTE
I
NTERFACE
C
OMMANDS
Refer to Appendix A.