Application-layer framing or application-level framing (ALF) is a method of allowing an application to use its semantics for the design of its network protocols.
This procedure was first proposed by D. D. Clark and David L. Tennenhouse.[1] It works as follows:
- The application splits the data into useful segments.
- These segments are called ADUs (application data units).
- The ADUs can be processed in any order.
- The lower layers keep the ADU borders.
This procedure simplifies the quality of service negotiation and provides a simpler method of error checking.
The Real-time Transport Protocol (RTP) is an example of where the semantics of the real-time application are used to segment the data.
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