Instance creation: horizontal dashed arrow to the newly created instance.MSC head, lifeline, and end: a vertical line with a box at the top, and a box or a cross at the bottom.Latest version has been published in February 2011. The MSC 2000 version added object orientation, refined the use of data and time in diagrams, and added the concept of remote method calls. The 1996 version added references, ordering and inlining expressions concepts, and introduced HMSC ( High-level Message Sequence Charts), which are the way of expressing a sequence of MSCs. The first version of the MSC standard was released on March 12, 1993. In connection with other languages it can be used to support methodologies for system specification, design, simulation, testing, and documentation. Since in MSCs the communication behaviour is presented in a very intuitive and transparent manner, particularly in the graphical representation, the MSC language is easy to The purpose of recommending MSC (Message Sequence Chart) is to provide a trace language for the specification and description of the communication behaviour of system components and their environment by means of message interchange. 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.Ī message sequence chart (or MSC) is an interaction diagram from the SDL family standardized by the International Telecommunication Union. A connection request is sent to the switch and a timer is started. Interaction diagram from the SDL family The diagram shows three entities.
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