ATM switch
An asynchronous transfer mode (ATM) is one of the asynchronous communications that has higher data transmission efficiency when compared with time division multiplexing (TDM) of the synchronous communication methods. Asynchronous transfer mode (ATM) technology was developed for broadband ISDN (integrated services digital network) systems to carry data traffic, such as digitized voice, video, images, and computer generated data. Compared with other network technologies, ATM provides large increases in maximum supported bandwidth, support for multiple types of traffic such as data, video, and voice transmissions on shared communication lines, and virtual networking capabilities, which increase bandwidth utilization and ease network administration. Asynchronous transfer mode (ATM) switches provide high-speed data exchange while minimizing the impact on overall system bandwidth. ATMs are commonly used in local area networks (LANs) and wide area networks (WANs). ATM switches have been used in wideband data transfer protocols, such as synchronous optical network (SONET) and synchronous transport stream (STS) systems. Asynchronous transfer mode networks are cell switching networks that transfer fixed length data units called "cells." Cells are transmitted from a source node to a destination node through ATM (or digital) switches, which are coupled together by way of communication lines. An ATM network includes several ATM switches connecting several end-systems. Each switch includes several ports to connect to end systems and other switches. A switch receives a cell on one port and forwards the cell on another port to provide a connection between the end-systems. ATM carries data asynchronously, automatically assigning data cells to available time slots on demand to provide maximum throughput. An ATM switch determines an output port which is an output destination of an ATM cell inputted from an input port. That is, the ATM switch stores a cell inputted from the input port in a buffer, and switches the stored cell, and then outputs the switched cell from a predetermined output port. An ATM switch comprises a cell buffer memory for storing cells, and a controller for storing cells in the cell buffer memory with timing control to avoid collision of cells for the same destination. An asynchronous transfer mode (ATM) switch accepts cells from many source input ports and routes them to many destination output ports. An ATM switch includes a plurality of input ports coupled to input communication lines and a plurality of output ports coupled to output communication lines.
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