Most widely used technologies to develop a MAN (Metropolitan Area Network) network are FDDI (fiber distribution data interface), ATM (Asynchronous Transfer Mode) and SMDS (switched multi megabit data service).ATM (Asynchronous Transfer Mode) is the most frequently used of all. ATM (Asynchronous Transfer Mode) is a digital data transfer technology. It was developed in 1980 to improve the transportation of real time data over a single network. ATM (Asynchronous Transfer Mode) works just like cell relay system, where data is separated in the form of fixed equal sized packets and is transferred overtime. The purpose of ATM (Asynchronous Transfer Mode) was to access clear audio and video results during a video conferencing. The attributes of ATM has enabled it to become a base of wide area data networking.
ATM (Asynchronous Transfer Mode) combines the characteristics of circuit switching and packet switching, which allows it to transfer even the real time data. FDDI is a standard for data transfer over LAN, which can be extended to the range of approximately 200kms. FDDI can help support the data transmission of many thousand users. This is the reason why it is referred to as the MAN (Metropolitan Area Network) technology. FDDI uses optical fiber for its basic infrastructure that is why it is referred to as fiber distribution data interface. When data is transferred through a connectionless service we use the technology named as SMDS. Connectionless service implies that data is transferred by storing the information in the header and it reaches its destination independently through any network. When the data is transferred using the technology of SMDS, it also forms small data packets just like in ATM. However SMDS allows the transmission of data over large geographical areas in the form of datagrams (the data packets of an unreliable data service provider). Nowadays MAN (Metropolitan Area Network) links are established using infrared and microwave signals.
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