Applicable Jumper Data; Table A-39. Modulator/Demodulator Jumper Selection - Comtech EF Data SDM-2020 Installation And Operation Manual

Data Interfaces
A.8.3.2

Applicable Jumper Data

When the ASI portion of the interface is used JP1 is normally positioned Off so that the
pins are not connected. Also, JP2 is normally set to On. This allows installation of the
interface in either the modulator or demodulator without moving any jumpers. Refer to
Table A-39 for Modulator/Demodulator Jumper Selection.
Jumper
JP1
JP1
JP2
JP3
JP4
JP4
Jumper
JP1
JP1
JP2
JP3
JP4
A–70
Table A-39. Modulator /Demodulator Jumper Selection
Modulator Jumper Selection
ON/OFF
ON Selects J6, the LVDS-DVB connector as an input.
OFF Normal Setting: Selects J6 as an output for Loopback or Loop Thru operation in
conjunction with the ASI signals.
ON Normal Setting: Selects pins 2 and 15 of J6 as GND.
Not Used For future use.
ON Selects pins 2 and 15 as REFCLKB and REFCLKA outputs from J6. This is used
as a byte clock reference by other equipment.
OFF Normal setting.
Demodulator Jumper Selection
ON/OFF
ON Selects J6 as an input for loopback operation.
OFF Normal Setting: Selects J6, LVDS-DVB connector, as an output for RX data.
Also, it is used for loopback operation in conjunction with the ASI signals.
ON Normal Setting: Selects pins 2 and 15 of J6 as GND.
Not Used For future use.
Not Used Jumper belongs on J2.
SDM-2020 Satellite Demodulator
Description
Description
Rev.3