The DVB-compliant QAM256 Digital video Modulator and Cable Up Converter meets all DVB requirements for transmission of digital video on broadband coaxial cable and microwave radio. The QAM256 features 4-QAM to 256-QAM modulation, 1 to 52 Mbps data rate, 1 to 8 MHz channel spacing and Reed-Solomon forward error correction. The modulator also supports field-changeable RS-422 Parallel, ASI and other standard DVB interfaces. Remote Monitor and Control (M&C) interface is provided through either a RS-485 or Ethernet remote port using SNMP protocol. The QAM256 provides efficient bandwidth utilization for digital video distribution systems. MMDS, LMDS, AML, cable television and multiple dwelling unit systems all benefit from this innovative modulator. QAM modulation solves the problem of providing multiple video and data channels within bandwidth limitations. The QAM256 has the versatility to adapt to the terrestrial broadband medium and give system operators full management and control of the available bandwidth. The space and money-saving internal cable up converter option conveniently removes the need for an external converter unit. The modulator meets the specifications of the ITU-T recommendation; J.83 Annex A & B (Telecommunication Standardization of the ITU for television and sound transmission). The interface module is a field-changeable module that contains either RS-422 parallel, ASI or other standard interface. The interface accepts data in an MPEG-2 transport format. The data is then passed to the channel encoder for processing. The Channel Encoder synchronizes to the MPEG-2 transport frame and performs scrambling (energy dispersal), and Reed-Solomon encoding (240, 188) and interleaving.
The MM200 Terrestrial Microwave Modem is an innovative and highly flexible platform configurable for data rates between 1 and 175 Mbps. The unit allows complete control over modulation density and channel bandwidth for efficiencies up to 5.3 Bps/Hz. The unique architecture of the MM200’s IF allows large improvements to fading and multipath via multiple digital equalizers.
