By Martin P. Clark

Aimed at execs making plans the expertise approach and infrastructure for company networks, this article presents a entire insurance of ATM expertise in a hugely readable structure. assurance contains an in-depth examine of the technical rules of ATM and a close overview of technical criteria. the writer assesses the main significant purposes of ATM, the prevailing and sure destiny difficulties and gives a large comparsion with replacement technologies.

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Thus, for example, in an ISDN network, the idle capacity in what is in effect an advanced telephone network is made available for data usage. g. 64 kbit/s channel) to carry a given data signal (typically 9600 bit/s) is six times as great as the capacity that would have been needed on a dedicated data network, so that the cost of converting data equipment to ISDN may not be justified by the meagre savings. The cell relay technique employed by ATM is a data switching methodology which has been adapted to be capable of switching voice.

It is applied to describe user applications which simultaneously employ different types of telecommunications sessions. Thus, for example, a multimedia application might be one running on a computer workstation which simultaneously permitted the user (in different windows presented on the screen) to send electronic mail and conduct a videoconference with his colleagues, while receiving separately another video signal and a fax. The requirement arises from the emergence in the computing world not only of new powerful video and image-based applications but also of multiple user computer operating systems such as UNIX, IBM's OS/2 and Windows NT.

G. 12 later in this chapter). During the negotiation, virtual paths and connections between the various nodes and other equipments are allocated, and the reference numbers of these connections, the combination of virtual path identifiers (VPIs) and virtual connection identifiers (VCIs), are confirmed over the signalling channel. These values (VPI and VCI) then appear in the header of any cells sent, in order to identify all those cells which relate to this connection. The functionality or device which exists at the end of a signalling virtual channel and conducts the act of signalling is called a signalling point (SP).

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