Error Correction Equipment and circuit requirement –Buffer –Reverse channel or channel turn around Retransmission - automatic repeat request (ARQ) Methods –Stop and wait ARQ - ACK and NAK: long data block, low error rate, & having a reverse channel –Continuous ARQ: long propagation time –Forward error correction (FEC): simplex transmission using Hamming code, Hagelbarger code, Bose-Chaudhuri code High cost (extra bits & codes)
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