SDM-2020 Satellite Demodulator manufactured by EFData, later to be merged with Comtech. At the time that these products were manufactured EFData manufactured two separate items, one was the SDM-2020M, this is the modulator, and to match this they built an SDM-2020D the demodulator.
This particular unit has 8PSK, 16QAM and Reed Solomon.
Here is a sample from the SDM2020D datasheet
• Digital Video Broadcast (DVB)
• Transparent Data Transmission
• Programmable 1.5 to 100 Mbit/s
• 8PSK and 16QAM (Optional)
• L-Band input 1 (Standard), 2 or 4 Optional
• 70/140 MHz Input (Optional), 1 input
The SDM-2020 Satellite Demodulator also excels in:
• High-speed data distribution
• Fiber and cable restoration