 | This article includes alist of references,related reading, orexternal links,but its sources remain unclear because it lacksinline citations. Please helpimprove this article byintroducing more precise citations.(December 2025) (Learn how and when to remove this message) |
Inwide area network computing, theLink Access Procedure for Frame Relay (orLAPF) is part of the network'scommunications protocol which ensures that frames are error free and executed in the right sequence.
LAPF is formally defined in theInternational Telecommunication Union standardQ.922. It was derived fromIBM'sSynchronous Data Link Control protocol, which is the layer 2 protocol for IBM'sSystems Network Architecture developed around 1975. ITU used SDLC as a basis to develop LAPF for theFrame Relay environment, along with other equivalents:LAPB for theX.25 protocol stack,LAPM for theV.42 protocol, and LAPD for theISDN protocol stack.
In Frame RelayLocal Management Interface (LMI) messages are carried in a variant of LAPF frames.
LAPF corresponds to theOSI model Data Link layer.
 | Thiscomputer networking article is astub. You can help Wikipedia byadding missing information. |