SDM-2020 Satellite Demodulator
Data Interfaces
Rev.3
A–25
Single-ended signals (MF and DF fault 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” (high)
and OK status is indicated by an “ON” (low).
Table A-12. RS-422 Connector Pinout (Per EIA-530), J5
Pin #
Signal Function
Name
Type
Comment
1
530 Shield
Shield
Mod/Demod
2
Transmit Data (TD-A)
BA-A
I
Modulator
3
Receive Data (RD-A)
BB-A
O
Demodulator
4
Request To Send (RS-A)
CA-A
I
Modulator
5
Clear To Send (CS-A)
CB-A
O
Modulator
6
DCE Ready (DM-A)
CC-A
O
Demodulator
7
Signal Ground
AB
GND
8
Receive Line Signal Detect (RR-A)
CF-A
O
Demodulator
9
Receive Timing (RT-B)
DD-B
O
Demodulator
10
Receive Line Signal Detect (RR-B)
CF-B
O
Demodulator
11
Terminal Timing (TT-B)
DA-B
I
Modulator
12
Send Timing (ST-B)
DB-B
O
Modulator
13
Clear To Send (CS-B)
CB-B
O
Modulator
14
Transmit Data (TD-B)
BA-B
I
Modulator
15
Send Timing (ST-A)
DB-A
O
Modulator
16
Receive Data (RD-B)
BB-B
O
Demodulator
17
Receive Timing (RT-A)
DD-A
O
Demodulator
18
N/C
19
Request To Send (RS-B)
CA-B
I
Modulator
20
Not Used
21
Demodulator Fault (DF)
DF
O
Demodulator
22
DCE Ready (DM-B)
CC-B
O
Demodulator
23
Not Used
24
Terminal Timing (TT-A)
DA-A
I
Modulator
25
Modulator Fault (MF)
MF
O
Modulator
A.4.3.3
Receive Output Connectors, J6/J7, BNC, Female
Duplicate signals exit both of these connectors on the demodulator to deliver receive data
to the terrestrial interface. J6 and J7 are both active at all times, and no selection is
required.
Summary of Contents for SDM-2020
Page 32: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 17 This page is intentionally left blank...
Page 35: ...SDM 2020 Satellite Demodulator Installation Rev 3 2 3 Figure 2 1 Typical Rack Installation...
Page 57: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 13 This page is intentionally left blank...
Page 65: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 21 This page is intentionally left blank...
Page 72: ...Operation SDM 2020 Satellite Demodulator 3 28 Rev 3 This page is intentionally left blank...
Page 75: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 31 This page is intentionally left blank...
Page 92: ...Operation SDM 2020 Satellite Demodulator 3 48 Rev 3 This page is intentionally left blank...
Page 209: ...Fast Option SDM 2020 Satellite Demodulator C 6 Rev 3 This page is intentionally left blank...
Page 212: ...SDM 2020 Satellite Demodulator Glossary Rev 2 g 3 W Watt...
Page 213: ...Glossary SDM 2020 Satellite Demodulator g 4 Rev 3 This page is intentionally left blank...