Introduction - If you have any usage issues, please Google them yourself
The book for the characteristics of communication software, introduced several applied to communication software requirements analysis stage and design stage of the formal language, including the Universal Modeling Language UML, message tracking language MSC and specifications and description language SDL, highlighted in the the field of telecommunications has been widely used SDL language. and to the design of a micro-switch software as an example to show how to use these formal language for communication software needs analysis, outline design and detailed design.