Protocol data unit: Difference between revisions

Revision as of 03:57, 23 May 2007

Revision as of 21:44, 3 June 2007

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#[[Information]] that is delivered as a unit among peer entities of a [[computer network|network]] and that may contain control information, [[address]] information, or [[data]].

#In layered systems, a unit of data that is specified in a [[communications protocol|protocol]] of a given [[layer]] and that consists of [[protocol-control information]] of the given layer and possibly [[User (telecommunications)|user]] data of that layer. For example: [[BPDU| Bridge PDU]] or [[iSCSI]] PDU

: Source: from [[Federal Standard 1037C]]

PDU's are relevant in relation to one of the first 4 layers of the [[OSI model]] as follows :

PDU's are relevant in relation to one of the first 4 layers of the [[OSI model]] as follows :

#The [[Layer 1]] PDU's are the [[streams]]

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#The [[Layer 3]] PDU's are the [[packets]]

#The [[Layer 4]] PDU's are the [[segments]]{{dn}} (e.g. [[TCP segment]])

    ([[Layer 5]] and above are referedreferred to as [[data]].)

Given a context pertaining to a specific layer, PDU is sometimes used as a synonym for its representation at that layer.

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== External links ==

* [http://www.uni-giessen.de/faq/archiv/osi-protocols/msg00000.html Do a search regarding "What is ASN.1?" or "pdu" to this external link]

[[Category:Data transmission]]

[[Category:Packets]]