Application of Petri Nets to Communication Networks: by Carla Capellmann, Heinz Dibold, Uwe herzog (auth.), Jonathan

By Carla Capellmann, Heinz Dibold, Uwe herzog (auth.), Jonathan Billington, Michel Diaz, Grzegorz Rozenberg (eds.)

Petri nets provide a mathematically outlined procedure for the specification, layout, research, verification and function assessment of concurrent dispensed structures. they give not just detailed semantics and a theoretical beginning, but in addition a graphical shape that enables the certainty of either info and keep watch over circulation in the related formalism. As an intuitively beautiful graphical type of presentation, Petri nets are the version of selection in a variety of applications.
Communications networks, starting from conventional telecommunication platforms to complex Internet-based info providers, are inherently disbursed and include structures with at the same time working parts. This quantity offers a range of the most recent advances within the use of Petri nets for the modeling, research and administration of conversation networks and structures within the broadest feel of those terms.

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Exchange of lectures among countries and universities is increasing year by year. For example, a Japanese instructor teaches Japanese history to New Zealand students via the system, and a New Zealand instructor teaches the economics of his or her country to Japanese students. Using the telecommunication networks, many kinds of distance education systems have been developed and put into practical use. Some of them are described here. 1 Audio Conferencing System The audio conferencing system uses telephone lines to transmit audio signals.

In the case of analog equipment TE2, such as an analog telephone, or an analog fax, the interface equipment TA acts as the interface between TE2 and NT2. The interface point between TA and TE2 is point R. In N-ISDN, the B-channel, D-channel, and H-channel are provided. 2 Terminal-line interface in B-ISDN. channel, which provides 8-, 16-, 32-, and 64-Kbps transmission services. The D-channel is a control channel and provides 16- and 64-Kbps services. The Hchannel is a user's communication channel and provides 384-, 1536-, and 1920-Kbps services.

Though expensive, this system has been widely used in distance education. Students not only see each other but also hear one another's voices and can see the text or graphics transmitted from the remote site. To reduce the cost, video compression technology has been developed and installed in the system. This includes MPEG1 andMPEG2 video compression technologies. 6 Video conferencing system. 7 Distance learning system via satellite, video transmission and MPEG2 5-6 Mbits. 6. 4 Satellite Communication System A satellite communication system involves a transmitter and a receiver installed at each station.

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