The ITU-T Specification and Description Language has been designed to specify and describe how telecommunication systems behave functionally. It has been used in a variety of fields, including data communication protocol specification.
This tutorial briefly explains the basic concepts of the version of the language, known as SDL-88, that was recommended by CCITT (part of ITU now re-named ITU-T) in 1987. This has subsequently been updated to SDL-92 and SDL-2000.
Click on a title below to open that part of the tutorial.
Note on the authors: This tutorial was originally prepared by Ferenc Belina and Dieter Hogrefe. Both were key contributors to SDL-88, and the subsequent SDL-92 and two of the three co-authors of the book 'SDL with Applications from Protocol Specifications'. Dieter Hogrefe subsequently has been more active in work on the TTCN, which is another ITU-T System Design Language. Ferenc Belina died at the end of 1992 after 3 months illness, but made a considerable contribution to SDL-92. It is a tribute to his work that much of SDL-88 continues in SDL-92 and SDL-2000 and so most of the original tutorial is still relevant for these versions. Rick Reed has edited the tutorial to reflect the existence of the later versions, SDL-92 and SDL-2000.
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