Ma. Ardis, FORMAL METHODS FOR TELECOMMUNICATION SYSTEM REQUIREMENTS - A SURVEY OF STANDARDIZED LANGUAGES, ANNALS OF SOFTWARE ENGINEERING, 3, 1997, pp. 157-187
Modem telecommunications systems are so complicated that informal lang
uages are no longer sufficient for expressing their requirements. A br
ief introduction to the nature of requirements for telecommunication s
ystems is given in this paper. The three standardized formal languages
for telecommunications, Estelle, LOTOS, and SDL, are described and co
mpared. Each language is evaluated, and a comparison of all three is o
ffered. Throughout the paper a common example is used.