Russell Ballestrini
a01f1b4aac
Each data byte is carried as a 12-bit Hamming codeword (8 data + 4 parity) inside one modem byte-frame, so any single-bit error self-corrects instead of failing the frame CRC and stalling the outbox on "no ack". Symbol levels are Gray-coded so an off-by-one quantization (the dominant error) is a single-bit flip Hamming can fix. Toggle ?fec=0 (both peers must match). Validated in Node: all 256 bytes x 12 bit positions corrected; modem recovers 30/30 with a +/-1 symbol error per byte. |
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