ATM generally refers to asynchronous transfer mode, is a fixed-length packet mode, and asynchronous time division multiplexing, the transmission of any rate of broadband signals and digital grade series information switching equipment. It is the basic technology used to realize the broadband integrated service digital network (?B-ISDN?), which can synthesize the services of voice, data, image and video at any rate.
ATM mainly provides users with high-speed, low-latency, switchable broadband circuits, the main applications are: high-speed interconnection of local area networks, high-quality videoconferencing, distance learning, telemedicine diagnostics, remote collaborative work, multimedia communications, on-demand distribution of frequency bandwidth (VOD) and television on demand, film and television remote distribution, and can provide a timed, optional bandwidth of various services.
Expanded Information:
ATM has the following characteristics:
1. Asynchronous Transfer Mode (ATM) integrates the advantages of circuit switching and packet switching, it uses a unified cell as the basic unit of transmission, i.e., 48 bytes of information code plus a 5-byte information header***53 bytes.
2, asynchronous transfer mode rate of 155Mb / s (STM-1) or 622Mb / s (STM-4), high-speed packet switching, in order to reduce the delay, and recently the rate of its appropriate reduction such as 52Mb / s, has been adopted by the ITU-T.
3, asynchronous transfer mode using a single structure can realize multimedia communications, and with a variety of user-network interface to provide users with a variety of services, and can be connected to any one of the existing services into a unified network.
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