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The term “metropolitan area network” (MAN) refers to a particular type of high-speed wide-area network service. Unlike local-area networks (LANs) that are typically installed in buildings or companies, MANs provide network infrastructure over a city-wide scale for use as regional networks run by CATV and telecommunication carriers as well as regional government or to support organizations that operate geographically spread services such as railways or highways.
It is anticipated that companies as well as public agencies such as local government, hospitals, and schools will increase their adoption of surveillance camera systems for security as well as IP triple play services that carry data, voice, and video over the same network links. This means that MANs require a high-speed, high-capacity backbone. Although MANs use fiber-optic communications, laying fiber over a large area is very expensive.
However, it is possible to construct a high-speed backbone at a low cost by utilizing unused capacity on optical fibers laid independently by organizations such as regional government and telephone, power, or railway companies. Because MANs involve a number of different organizations sharing the same network, a high level of security is essential. Meanwhile, this public infrastructure also requires “fault-tolerant networks”. Allied Telesis supports the building of MANs through technology for wide-area optical networks together with a wide range of security solutions including authentication, quarantine, and encryption.
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Regional public networks provide the infrastructure for Juki Net (Japan’s national resident registration network). Now that the process of mergers between municipalities (known in Japan as the “great Heisei-era consolidation”) has run its course, this essential service is playing a critical role supporting the regional community where it is used to connect numerous public agencies such as education boards and hospitals. |
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Passengers can pass through railway station ticket gates simply by placing a smartcard over a scanner while electronic toll collection (ETC) operates 24-7 processing toll payments at high speed. These services that operate over wide areas are built on network infrastructure that provides secure and reliable connections.
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