ATM stands for Asynchronous Transfer Mode. It is a high speed mode of transporting data from one point to another. With ATM, you are able to transmit voice, data and video in small data packets over a single network. It can carry traffic at speeds up to 622 Mbps. Data is transmitted in fixed length cells which gives it advantages over other methods of data transfer. ATM is a cell switching network which takes data and breaks it into 48 bytes. These bytes are then affixed to a 5 byte header which will contain the source and destination information. The use of cell switching and multiplexing is employed and the information is routed in a calculated manner. This method makes it so that your transmission is constant and has a guaranteed capacity.
ATM is unlike other time division multiplexing technologies, which are on a time sharing transmission method. With TDM (time division multiplexing) the user is given a time slot to which he or she can send data. The user can
http://www.alumni.caltech.edu/~whitegt/atm.html
informs the host of success. The host uses the connection identifier when sending or receiving cells. When it finishes using a connection, the host again communicates with the ATM switch to request that the connection be broken. The switch disconnects the two computers. Disconnection is equivalent to hanging up a telephone at the end of a telephone call. After a disconnection, the switch can reuse the connection identifier.
ATM is a very reliable method of data transfer because it is versatile in which it can transfer voice data and video over one network. It is foreseeable that it will become more widespread usage wise and become the backbone of many networks because the protocol is flexible over different networks.
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