Abstract
When SDL is used for the implementation, different parts of the system may be implemented by different tools. Data communicated between different parts needs to be encoded and decoded in the same way by each part if the information encoded by one part is to be seen as the same value by another part. The ITU-T Recommendation Z.104 ‘Encoding of SDL Data’ that is currently being refined for approval, allows the data encoding to be specified for communication paths or for specific encoding and decoding expressions. This paper presents the Recommendation in a less formal way than the ITU-T document. The presentation adds examples illustrating uses. The use of the ASN.1 encoding and text encoding is shown. One principle of Z.104 is to introduce an implicit data type that represents all the signals that can be received on a path. The paper further extends SDL to introduce ways to use implicit data types associated with interfaces.
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References
ITU-T: Recommendation T.50 (09/02), International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) - Information technology - 7-bit coded character set for information interchange. International Telecommunication Union, Geneva
ITU-T: Recommendations X.680-683, Abstract Syntax Notation One (ASN.1). International Telecommunication Union, Geneva
ITU-T: Recommendations X.690-694, ASN.1 encoding rules. International Telecommunication Union, Geneva, http://www.itu.int/ITU-T/studygroups/com17/languages/
ITU-T: Recommendation Z.100 (08/02), Specification and Description Language (SDL). International Telecommunication Union, Geneva, http://www.itu.int/ITU-T/studygroups/com17/languages/
ITU-T: Z.105 (07/03), SDL combined with ASN.1 modules (SDL/ASN.1). International Telecommunication Union, Geneva, http://www.itu.int/ITU-T/studygroups/com17/languages/
Reed, R.: Encoding of SDL Data. ITU-T Study Group 17 Study Period 2001-2004, Contribution COM17-C86-E, January 2004. Revised as Delayed Contribution COM17-D151-E July 2004, and further revised as TD3259 (July 2004)
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© 2005 Springer-Verlag Berlin Heidelberg
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Reed, R. (2005). Data Encoding for SDL in ITU-T Rec. Z.104. In: Amyot, D., Williams, A.W. (eds) System Analysis and Modeling. SAM 2004. Lecture Notes in Computer Science, vol 3319. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-31810-1_6
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DOI: https://doi.org/10.1007/978-3-540-31810-1_6
Publisher Name: Springer, Berlin, Heidelberg
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