By Kenneth D. Kok
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Extra resources for Communicating Systems & Networks: Traffic & Performance
In this case it goes from SP to SP); - Non-associated mode: the signalling channel follows a different path. (It then uses several STP); the latter is itself divided into dissociated mode and quasi-associated mode. In dissociated mode, the messages can use a large number of STP and can follow different paths. In quasi-associated mode however, the routing is predetermined with a maximum of two STP. 3. Mobile networks The GSM network (global system for mobile communication) This is the basic mobile telephone network.
Communication set-up reference diagram The first diagram presents the principle of the exchange of information (horizontally) from an initial request up to the confirmation that the action is successful. The vertical dimension represents the processing delays needed to set up the demand. The nature and the quantity of information to be exchanged depend evidently of the technologies and protocols in use (circuit, packet). The exchange may be complex, as for instance for communications between mobile users involving intelligent networks.
This type of problem will also be considered in the rest of this book. 6. Private networks The large networks we have just presented tend to be public networks. But private organisations, such as large companies and universities, organise the communication between their employees and their computer equipment by means of private networks. PABX (Private branch exchange) Private telephone networks such as PABX are quite similar to public networks. They are simply reduced to a minimum level of equipment for a small number of subscribers (ranging from a few dozen to a few thousand), but also offer facilities specific to companies such as an internal directory, conferencing, transfers, automatic callback, voice mail, call presentation and call filtering.