A DVD presentation for the support of teaching telecommunications protocols

This paper describes a DVD (digital versatile disc) presentation for help in teaching telecommunications protocols. Our goal was to make the teaching of protocols more illustrative than it usually is when using material from textbooks or standards. We made films that show what happens when an ISDN subscriber calls another subscriber, which has two ISDN telephones. The films show the processes and signals that occur in the communication between the telephones and ISDN exchange, to which all the telephones are connected, when DSS1 (digital subscriber signalling system number 1) call control signalling is used.