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Line 9: This means that A may still receive ACK0 when it is already transmitting messages with sequence number one. (And vice-versa.) It treats such messages as [[negative-acknowledge character]]s (NAKs). The simplest behaviour is to ignore them all and continue transmitting. The protocol may be initialized by sending bogus messages and acks with sequence number 1. The first message with sequence number 0 is a real message. :) ==See also==

Alternating bit protocol: Difference between revisions