Atm Network

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in the late 1960's. The interconnection of computer systems over telecommunication networks soon became a requirement. Modems were used at first to generate analogue signals compatible with the PSTNs from the digital computer data to allow such interconnections. The already wide spread use of the PSTNs was an advantage of this scheme, however it was soon recognized as not being an optimum solution for data transfer.
The analogue PSTNs were unsuitable in terms of switching, capacity (bandwidth) and channel noise. In data communication applications, data tends to be transferred in bursts, separated by silence. The constant connection provided by circuit switching therefore does not provide optimum usage of the network resources. The PSTNs were ordinally dimensioned to provide capacity to transport voice signals, which provides very limited bandwidth and therefore a low maximum rate of data transfer. The noise present in the PSTNs due to poor channel quality lowers information ...

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with a low susceptibility to noise. These advancements coupled with the ISDN concept have led to the current information age: the notion of wideband networks capable of supporting high speed data communications, video, multi﷓media, etc. is emerging.
The broadband﷓ISDN (B﷓ISDN) concept is the proposed realization of an integrated broadband communications network. The transfer mode for implementing the B﷓ISDN defined and accepted by the ITU﷓T is the asynchronous transfer mode (ATM). Is has been widely accepted that a single network capable of supporting all required communications services is at the core of the current movement of communications ...

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