Comtech EF Data SDM-2020 - Manual (Page 139)

SDM-2020 Satellite Demodulator Revision 4
LVDS Data Interface MN/SDM2020D.IOM
8–3
Table 8-1. LVDS Specifications
General Specifications
Interface Type LVDS/DVB Synchronous, Serial/Parallel.
Data Rate 1.5 to 32 Mbps, serial.
1.5 to 100 Mbps, parallel.
Data Framing Formats 188, 204 byte packets per ETS 300 421, and None.
Connectors
25-pin D female for transmit data.
25-pin D female for receive data.
9-pin D female for reference clocks plus faults.
Electrical Properties Per TIA/EIA-644.
Signal Types TX: TX Clock, TX Data, Data Valid, and Sync per TM1449.
The modulator does not require Sync or Data Valid with the 188 or
204 byte patterns.
Voltage Levels 290 ± 40 mV differential into 100 Ω
8.1.3 Configuration
The interface (Figure 8-1) provides DVB compliant operation when pins 2 and 15 are
grounded using the “DVB Configuration” jumper settings described below.
In a demodulator, the LVDS interface (J3) only has provision for DVB Configuration,
and the Master Clock Input is not used. See jumpers J2 and J7.