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SDM-2020 Satellite Demodulator
A.2.4.3
Auxiliary, J5
This port provides for other modem-specific signals not otherwise defined for either or
both of the two data connectors.
A.2.4.3.1
Connector Pinout, J5
The connector is a sub-miniature, 9-pin, female D connector, with threaded jack nuts
(refer to Table A-6 for connector pinout).
Differential pairs are RS-422 compatible.
Note: The sense of differential signal pairs is a logic "1" when "B" is positive with
respect to "A."
Single-ended signals (MF and DF fault signals) are open-collector where:
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).
Pin #
1
2
Demod Fault Indicator
3
Send Timing
4
5
Not Used
6
Mod Fault Indicator
7
Carrier Detect
8
Send timing
9
Not Used
Rev.3
V
=12V max. And V
oh
ol
Table A-6. Auxiliary Connector Pinout (J5)
Signal Function
Name
DF
ST-A
MF
/CD
ST-B
=0.5V max. @ I
=8 ma.
ol
Type
GND
Signal Ground
O
Demodulator Summary Fault
Redundancy switch application
O
Modulator
SCT for terrestrial synchronization
N/C
O
Modulator Summary Fault
Redundancy switch application
O
Demodulator
O
Modulator
SCT for terrestrial synchronization
Data Interfaces
Comment
A–11
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