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I have removed the UML Sequence Chart picture that actually does not exist. And I have listed the usual misunderstanding between UML Sequence Diagram and ITU-T MSC. |
m Link "interaction diagram" in intro |
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[[File:Typical MSC (Message Sequence Chart).png|thumb|The diagram shows three entities. At start the phone is disconnected. A user tries to establish a connection. A connection request is sent to the switch and a timer is started. An alternative deals with two possibles responses: 1 - The timer goes off because the switch did not reply and the phone goes back to the disconnected state.2 - The switch grants the connection and the call is established.]]
A '''message sequence chart''' (or '''MSC''') is an [[interaction diagram]] from the [[Specification and Description Language|SDL]] family standardized by the [[International Telecommunication Union]].
The main area of application for message sequence charts is as for communication behaviour in [[Real-time computing|real-time systems]], more specifically telecommunication [[electronic switching system]]s.
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