Comtech VIPERSAT Switched SCPC Modem

SDM-2020M and SDM-2020D High Speed and Video Modulator and Demodulator

The SDM-2020M Satellite Modulator and SDM-2020D Satellite Demodulator are programmable, variable-rate satellite modulators and demodulators 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.

SDM-2020 Satellite Modulators & Demodulators are ideal for

Digital Video Broadcast (DVB)
Digital Satellite News Gathering (DSNG)
Primary and backhaul transmission for:
Contribution
Distribution
ATSC (HDTV)
Direct To Home (DTH)
High-speed data distribution
Fiber and cable restoration
Internet

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):
ieved with the addition of only 2.2% overhead.

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

The SDM-2020 Satellite Modulator/Demodulator are data rate programmable units. Desired data or symbol rates are easily programmed. 8PSK and 16QAM increase the data rate through a satellite transponder compared to QPSK. The advanced higher order modulation of the SDM-2020 optimizes video or data applications.

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.

The SDM-2020M and SDM-2020D units must be fitted with the CIM-25 module in order to be used in a Vipersat solution.

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Satcom-Services and Comtech Vipersat Networks Inc. reserves the right to make changes to specifications of products described in these pages at any time without notice and without obligation to notify any person of such changes.

SATCOM ANTENNAS - SATCOM UPCONVERTERS (BUCs) - SATCOM CHASSIS - SATCOM CONVERTERS - SATCOM HUBS - SATCOM IP PRODUCTS -SATCOM LNCs - LNAs - SATCOM MODEMS - SATCOM MONITOR and CONTROL SYSTEMS - SATCOM MULTIPLEXERS - SATCOM NETWORKING - SATCOM POWER AMPLIFIERS - SATCOM SSPAs - SATCOM PROTECTION SWITCHES - SATCOM RECEIVERS - SATCOM ROUTERS - SATCOM TERMINALS - SATCOM TRANSCEIVERS - SATCOM UPS (UNINTERRUPTED POWER SYSTEMS)

© 2005 Satcom Services
Contact webmaster Innovative Internet


SATCOM ANTENNAS - SATCOM UPCONVERTERS (BUCs) - SATCOM CHASSIS - SATCOM CONVERTERS - SATCOM HUBS - SATCOM IP PRODUCTS -SATCOM LNCs - LNAs - SATCOM MODEMS - SATCOM MONITOR and CONTROL SYSTEMS - SATCOM MULTIPLEXERS - SATCOM NETWORKING - SATCOM POWER AMPLIFIERS - SATCOM SSPAs - SATCOM PROTECTION SWITCHES - SATCOM RECEIVERS - SATCOM ROUTERS - SATCOM TERMINALS - SATCOM TRANSCEIVERS - SATCOM UPS (UNINTERRUPTED POWER SYSTEMS)
© 2005 Satcom Services	Contact webmaster Innovative Internet