REFURBISHED - COMTECH SDM-2020M - Digital Video Satellite Modulator The SDM-2020 Satellite Modulator is a programmable, variable-rate satellite modulator used for digital video and high-speed data applications. The SDM-2020 supports open network modes compliant with the EN 300 421/EN 301 210 specification for Digital Video Broadcasting (DVB) by satellite. The SDM-2020 has a plug-in data interface module installed in the rear of the chassis. This module provides flexible adaptation to the various physical and electrical interfaces found in the communications industry. FEATURES - DVB or Transparent Data Transmission - Programmable 1.5 to 100 Mbps - QPSK - 8PSK and 16QAM (Optional) APPLICATIONS The SDM-2020 Satellite Modulator is ideal for: - Digital Video Broadcast (DVB) - Digital Satellite News Gathering (DSNG) - Primary and backhaul transmission for: - Contribution - Distribution - ATSC (HDTV) - Direct To Home (DTH) The SDM-2020 Satellite Modulator also excels in: - High-speed data distribution - Fiber and cable restoration - Internet INTERFACES Field-changeable interfaces for the SDM-2020 Satellite Modulator include: - EIA-422 Serial/Parallel Data Interface - LVDS Low Voltage Differential Signal Interface - ASI / 422 ASYNC/Serial Data Interface - ECL-HSSI Serial Data Interface - G.703 Data Interface - SMPTE 310M (SSI-DVB) Serial Data Interface - DVB ASI / LVDS DIGITAL VIDEO BROADCAST (DVB) The SDM-2020 Satellite Modulator supports satellite channel adaptation for DVB applications. It translates the data stream from an MPEG-2 multiplexer to an RF satellite channel as defined by EN 300 421(QPSK) and EN 301 210 (8PSK and 16QAM): - Randomization for energy dispersal (scrambling) - Outer coding, Reed-Solomon EIA (204, 188, T=8) - Convolutional interleaving (depth I=12) - Inner coding QPSK, 1/2, 2/3, 3/4, 5/6, and 7/8 rates - Inner coding 8PSK, 2/3, 5/6, 8/9 - Inner coding 16QAM, 3/4 and 7/8 - Spectral masks for DVB and 99% within 1.2 x symbol rate DATA RATE FLEXIBILITY The SDM-2020 Satellite Modulator is a data rate programmable unit. Desired data or symbol rates are easily programmed. MAXIMUM DATA THROUGHPUT 8PSK and 16QAM increase the data rate through a satellite transponder compared to QPSK. The examples below are for a 36 MHz transponder: - 8PSK 5/6: 1 carrier at 68 Mbit/s (1 modem) - 16QAM 7/8: 2 carriers at 34.36 Mbit/s (2 modems) Similar results are available using transponders with different bandwidths. The advanced higher order modulation of the SDM-2020 optimizes video or data applications. POWERFUL CONCATENATED CODING The powerful industry standard concatenated coding used by the SDM-2020 product family reduces the Eb/No needed to produce low bit error rates (BER). This combination of inner coding (Viterbi/trellis) combined with outer Reed- Solomon coding yields unparalleled performance. CONFIGURATION RETENTION The SDM-2020 modulator maintains its configuration in non-volatile memory. Once power is restored, the unit returns to the configuration in use before the power loss.