ELE 5OPN Lecture Notes - Asynchronous Transfer Mode, Time-Division Multiplexing, Quality Of Service
20 Jan 2017
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Asynchronous transfer mode (atm) lecture 1 notes. Asynchronous transfer mode (atm) is a standard developed by the atm forum for transfer of data, voice and video over sonet (synchronous optical network). The inspiration for atm came from the fact that time division multiplexing (tdm) wasted bandwidth when there was no data to transfer in a particular time slot. From the figure, we observe that if there is no data available to transmit (on data lines), then that time slot is not filled by the next data. Instead that time slot is left free leading to bandwidth wastage. Atm is an improvement to time division multiplexing in the sense that if there is no data to be transmitted in a time slot, the next available data is transmitted instead. Atm transmits data in the form of small size cells. The payload is 48 bytes long and the overhead is. 5 bytes thus making the cell length to 53 bytes.
