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'''Alternating bit protocol''' ('''ABP''') is a simple [[network protocol]] operating at the [[data link layer]] ([[OSI model|OSI]] layer 2) that retransmits lost or corrupted messages using FIFO semantics. It can be seen as a special case of a [[sliding window protocol]] where a simple timer restricts the order of messages to ensure receivers send messages in turn while using a window of 1 bit.<ref>{{cite book|last=Tel|first=Gerard|title=Introduction to distributed algorithms|year=2000|publisher=Cambridge|isbn=0521794838|pages=85}}</ref>
It was used by the [[ARPANET]] and the [[Packet switching#EIN|European Informatics Network]].<ref>{{Cite book|last=Davies|first=Donald Watts|url=https://archive.org/details/computernetworks00davi|url-access=registration|title=Computer networks and their protocols|date=1979|publisher=Chichester, [Eng.] ; New York : Wiley|others=Internet Archive|isbn=|___location=|pages=[https://archive.org/details/computernetworks00davi/page/206 206]}}</ref>▼
== Design ==
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A variant of this protocol, introduced by [[Philips]], is called [[Bounded Retransmission Protocol]] (BRP). Unlike ABP, BRP deals with sequence numbers of datum in the file and interrupts transfer after fixed number of retransmissions for a datum.<ref>{{cite web|url=https://www.irif.fr/~sighirea//trex/demos/brp.html|title=TreX's Examples -- Bounded Retransmission Protocol|website=www.irif.fr}}</ref>
== History ==
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==See also==
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