product
Cable - Multi-channel DVB-CJ83 FEC encoder
Product code: CMS0044
The Commsonic CMS0044 J.83abc/DVB-C Cable FEC Encoder combines all of the channel coding and Forward Error Correction functions specified by DVB-C and by J83 Annexes A B and C. It is designed to interface to external modulators or advanced upconverting DACs such as the Analog Devices AD9789.
The CMS0044 includes functions for framing, scrambling, interleaving, Reed-Solomon coding, trellis coding, and QAM mapping.
The multi-channel encoder uses a common transmission mode, so symbol timing is common for all channels. The encoder may be built with individual interleave modes, as this does not impact data symbol timing. However, this requires more memory bandwidth.
Block diagram
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Release note
DownloadTechnical data brief
5th November 2008 (446 kB)IP Guide
9th December 2008 (838 kB)Altera megacore
v0.5.2 (9.25 MB)Standards compliance
DVB-C EN 300 429
ITU J83 Annexes A/B/C
DOCSIS 1.x/2.0/3.0
Features
On/off -chip interleaver memory.
Mapped/unmapped symbol data outputs
Single or multiple channels per core.
Single or multiple standards per core.
Inputs
Standard MPEG Transport Streams.
NULL packet insertion and PCR correction.
Optional PRBS TS packet insertion.
On-air TS rate reference clock.
TS input and output rate estimation.
NULL TS packet removal/filtering.
Automatic TS re-synchronisation.
Cypress/Gennum ASI interface.
Seamless integration with Altera ASI megacore.
Outputs
External AD9789 interface
Implementation
Single external clock source.
Optimised for Xilinx and Altera.
Plug-ins / Extensions
ASI/SPI interface with TS PCR rate adaptation.