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CMMB Multiplexer

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Product Features


  • The CMMB Multiplexer option provides frame generation that is compliant with Mobile Multimedia Broadcasting specifications
  • One or two frequencies, user configured – Upgradable to up to 6 frequencies
  • Up to 160 services
  • IPv4 and IPv6 support
  • Control Information Table generation: NIT, CMCT, CSCT, SMCT, SSCT, ESG Basic Description Table, Urgent Broadcast Table and Conditional Access Table
  • Bandwidth: 8 MHz
  • Three modes of interleaving
  • LDPC Code Rate: ½ and ¾
  • Internal GPS
  • Optional Hot Swapping between main and backup multiplexers

Standards Compliance

  • Mobile Multimedia Broadcasting Part 1: Framing Structure, Channel Coding and Modulation for Broadcasting Channel, CMMB
  • Mobile Multimedia Broadcasting Part 2: Multiplexing, CMMB Technical Working Group
  • Mobile Multimedia Broadcasting Part 3: ESG Guide
  • Mobile Multimedia Broadcasting Part 4: Urgent Broadcast
  • Mobile Multimedia Broadcasting Part 5: Data Broadcast
  • Mobile Multimedia Broadcasting Part 6: Conditional Access
  • Mobile Multimedia Broadcasting System Multiplexer Technical Requirement V2.10
  • Mobile Multimedia Broadcasting System: Encryption & Authorization Multiplexing V2.01
  • H.264 Final Draft, ISO/IEC 14496-10 AVC
  • Internet Protocol, RFC 0760
  • Internet Protocol, Version 6 (IPv6), RFC 2460
  • User Datagram Protocol, IEN-88
  • RTP: A Transport Protocol for Real-Time Applications, RFC 3550
  • SDP Session Description Protocol, RFC 2327
  • RTP Payload Format for, RFC 3984
  • RTP Payload Format for AC-3 Audio, RFC 4184
  • RTP Profile for Audio and Video Conferences with Minimal Control, RFC 1890
  • ISO/IEC 13818-1

Product Description

Multiplexing is used to encapsulate multiple Audio, Video, and Data services and Control information in Multiplex Frames (MMB Part 1, 2). The main functions of the multiplexer are: receive the incoming data; prepare control and service information tables; encapsulate the data in frames depending on the data type and classification criteria; schedule time slots maintaining appropriate FIFO levels; and distribute the multiplexed service and control tables as MPEG-2 TS packets to modulators through ASI interfaces. The multiplexer can be used in two possible scenarios: at the Head-End as a central multiplexer of global services, simultaneously multiplexing one or two networks (1), or locally as a multiplexer of local content (2).  The multiplexer is designed to satisfy the requirements in both scenarios and operate in either of them with minimal configuration.

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