Comtech EF Data SDM-2020, Installation And Operation Manual

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Data Interfaces SDM-2020 Satellite Demodulator
A–72 Rev.3
A.8.6 Connector Pinout Data
A.8.6.1 ASI Connector Pinout
The ASI interface is shown below:
J3, J4 Transmit Data Input, BNC female
J7 Receive Data Output, BNC female
A.8.6.2 LVDS Connector Pinout (J6)
The LVDS connector (Table A-41) is a 25-Pin D female type, with threaded jack nuts.
LVDS signal levels are as defined in EN 50083-9. The differential sense of all signal
pairs is a logic “1” when “A” is positive with respect to “B.” Some DBS applications
require an inverted data or clock polarity and control of the signal polarity (normal or
inverted) is provided.
Input / Output (I/O) of the interface is determined by a) whether it is plugged into a
modulator or demodulator and b) Loopback or Loop Thru programming.
Table A-41. LVDS Connector Pinout (J6)
Signal Function/Name Pin # Type Comment
Clock A 1 I / O Mod / Demod
System Gnd / REFCLKB 2 O / Gnd Mod / Demod,
Demod – GND only, no clock
available
Data 7 A(MSB/Serial) 3 I / O Mod / Demod
Data 6 A 4 I / O Mod / Demod
Data 5 A 5 I / O Mod / Demod
Data 4 A 6 I / O Mod / Demod
Data 3 A 7 I / O Mod / Demod
Data 2 A 8 I / O Mod / Demod
Data 1 A 9 I / O Mod / Demod
Data 0 A 10 I / O Mod / Demod
DVALID A 11 I / O Mod / Demod
SYNC A 12 I / O Mod / Demod
Cable Shield 13 I / O Mod / Demod
Clock B 14 I / O Mod / Demod
System Gnd / REFCLKA 15 O / Gnd Mod / Demod
Demod – GND 0nly, no clock
available
Data 7 B (MSB/Serial) 16 I / O Mod / Demod
Data 6 B 17 I / O Mod / Demod
Data 5 B 18 I / O Mod / Demod
Data 4 B 19 I / O Mod / Demod