The ITU Specification and Description Language was first standardized in 1976. Up to 1992 it was revised four-yearly, matching rapid advances in computer technology and the telecommunications industry. After SDL-92, the next major change was SDL-2000, which is still the current standard. A new version has been under development with an initial target of producing a version called SDL-2008. This was now renamed SDL-2010 and intended be ready for the ITU approval process in December (this target was missed).
This tutorial presented the differences between SDL-2000 and SDL-2010. The changes range from extending the character set for names to full Unicode to the removal of features such as exception handling. Some new features are added such as input via, a specific gate enabling the signals received on different gates to be distinguished. The standards are also reorganized (and to some extent rewritten) to more clearly separate
After the presentation there will be a discussion on SDL-2010, and what the plan might be for further language changes.
|Rick Reed is the ITU Rapporteur for the 2009-2012 study of Formal languages and telecommunication software, which includes work on the Specification and Description Language.|