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In [[wide area network]] computing, the '''Link Access Procedure for Frame Relay''' (or '''LAPF''') is part of the network's [[communications protocol]] which ensures that frames are error free and executed in the right sequence. <br />
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LAPF is formally defined in the [[International Telecommunication Union]] standard [[Q.922]]. It was derived from [[IBM]]'s [[Synchronous Data Link Control]] protocol, which is the layer 2 protocol for IBM's [[Systems Network Architecture]] developed around 1975. ITU used SDLC as a basis to develop LAPF for the [[Frame Relay]] environment, along with other equivalents: [[LAPB]] for the [[X.25]] protocol stack, [[LAPM]] for the [[ITU-T V.42|V.42]] protocol, and LAPD for the [[ISDN]] protocol stack. <br />
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In Frame Relay [[Local Management Interface]] (LMI) messages are carried in a variant of LAPF frames.<br />
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LAPF corresponds to the [[OSI model]] Data Link layer.<br />
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==See also==<br />
* [[Link access procedure]]<br />
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==External links==<br />
*[http://www.cisco.com/en/US/docs/internetworking/technology/handbook/Frame-Relay.html Cisco Frame Relay documentation]<br />
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[[Category:Link access protocols]]<br />
[[Category:Link protocols]]<br />
[[Category:Frame Relay]]<br />
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