What modem can be used with a next?

A FEC decoder decodes the Forward error correction code that is used in the specific signal. For example, Digital video broadcasting standard defines a concatenated code consisting of inner convolutional (standard NASA code, perforated, with rates 1 / 2, 2 / 3, 3 / 4, 5 / 6, 7 / 8), interleaving and outer Reed-Solomon code (block length: 204 bytes, information block: 188 bytes, can correct up to 8 bytes in the block).