• A MAN, while larger than LAN is limited to city or group of nearby corporate offices. It uses similar technology of LAN.
• The Metropolitan Area Network standards are sponsored by the IEEE, ANSI and the Regional Bell operating companies. The AMN standard is organised around a topology and technique called Distributed Queue Dual Bus (DQDB).
3) Wide Area Networks (WAN)
• A WAN provides long distance transmission of data
• A Network that covers a larger area such as a city, state, country or the world is called wide area network.
• Subnet consists of transmission lines and switching elements. The transmission line is used for data transfer between two machines. switching elements are used for connecting two transmission lines. Switching elements are specialized computers. It selects the proper outgoing line for incoming data and forward the data on that line.
• The switching elements are basically computers and they are called packet switching nodes, intermediate systems and data switching exchanges. These switching elements are also called routers.
• WAN uses hierarchical addressing because they facilitate routing. Addressing is required to identify which network input is to be connected to which network output.
• MAN provides the transfer rates from 34 to 150 bps.
• MAN is designed with two unidirectional buses. Each bus is independent of the other in the transfer of traffic. The topology can be designed as an open bus or a closed configuration.
• MAN's are based on fiber optic transmission technology and provide high speed interconnection between sites. It can support both data and voice.
• MAN as a special category is that a standard has been adopted for them and this standard is now being implemented. It is called IEEE 802.6.
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