UniPro protocol stack: Difference between revisions

Revision as of 14:52, 1 April 2011

Revision as of 14:53, 1 April 2011

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An L4 segment, is essentially the payload of an L3 packet. The L4 header, in its short form, consists of just a single byte.

The main field in the short L4 header is a 5-bit "CPort" identifier which can be seen as a subaddresssub-address within a UniPro device and is somewhat analogous to the [[TCP and UDP port|port]] numbers used in [[Transmission Control Protocol|TCP]] or [[User Datagram Protocol|UDP]]. Thus every segment (with a short header) is addressed to a specific CPort of specific UniPro device.

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A single bit in the segment header also allows segments to be defined with long segment headers. UniPro v1.14 does not define the structure of such segment formats (except for this single bit). Long header segments may be generated via the long header trap described in the L3 section.

===L4 connections===