Comtech EF Data SDM-2020, Installation And Operation Manual

Page: 171 / 215

Data Interfaces SDM-2020 Satellite Demodulator
A–70 Rev.3
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.
Table A-39. Modulator /Demodulator Jumper Selection
Modulator Jumper Selection
Jumper ON/OFF Description
JP1 ON Selects J6, the LVDS-DVB connector as an input.
JP1 OFF Normal Setting: Selects J6 as an output for Loopback or Loop Thru operation in
conjunction with the ASI signals.
JP2 ON Normal Setting: Selects pins 2 and 15 of J6 as GND.
JP3 Not Used For future use.
JP4 ON Selects pins 2 and 15 as REFCLKB and REFCLKA outputs from J6. This is used
as a byte clock reference by other equipment.
JP4 OFF Normal setting.
Demodulator Jumper Selection
Jumper ON/OFF Description
JP1 ON Selects J6 as an input for loopback operation.
JP1 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.
JP2 ON Normal Setting: Selects pins 2 and 15 of J6 as GND.
JP3 Not Used For future use.
JP4 Not Used Jumper belongs on J2.