Metropolitan area networks, or MANs, are large computer networks usually spanning a city. They typically use wireless infrastructure or Optical fiber connections to link their sites.
IEEE definition
The IEEE 802-2001 standard describes a MAN as being:
“ A MAN is optimized for a larger geographical area than a LAN, ranging from several blocks of buildings to entire cities. MANs can also depend on communications channels of moderate-to-high data rates. A MAN might be owned and operated by a single organization, but it usually will be used by many individuals and organizations. MANs might also be owned and operated as public utilities. They will often provide means for internetworking of local networks. Metropolitan area networks can span up to 50km, devices used are modem and wire/cable ”
Authors Kenneth C. Laudon and Jane P. Laudon of Management Information Systems: Managing the Digital Firm 10th ed. define Metropolitan Area Networks (MAN) as:
“ Wide Area Networks (WANs) span broad geographical distances - entire regions, states, continents, or the entire globe. The most universal and powerful WAN is the Internet. Computers connect to a WAN through public networks such as the telephone system or private cable systems, or through leased lines or satellites. A Metropolitan Area Network (MAN) is a large computer network that spans a metopolitan area or campus. Its geographic scope falls between a WAN and LAN. MANs provide Internet connectivity for LANs in a metropolitan region, and connect them to wider area networks like the Internet.
Reference;
http://en.wikipedia.org/wiki/Metropolitan_area_network
