From Wikipedia, the free encyclopedia
A
metropolitan area network (
MAN) is a
computer network
in which two or more computers or communicating devices or networks
which are geographically separated but in same metropolitian city and
are connected to each other are said to be connected on MAN.The limits
of Metropolitian cities are determined by local municipal corporations
and we cannot define them. Hence, the bigger the Metropolitian city the
bigger the MAN,smaller a metro city smaller the MAN.
The
IEEE 802-2002 standard describes a MAN as being:
[1]
| “ |
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. |
” |
Authors Kenneth C. Laudan and Jane P. Laudon (2001) of
Management Information Systems: Managing the Digital Firm 10th ed. define a metropolitan area network as:
| “ |
A
Metropolitan Area Network (MAN) is a large computer network that spans a
metropolitan 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. |
” |
Implementation [edit]
Some technologies used for this purpose are
Asynchronous Transfer Mode (ATM),
FDDI, and
SMDS. These technologies are in the process of being displaced by
Ethernet-based connections (e.g.,
Metro Ethernet) in most areas. MAN links between local area networks have been built without cables using either
microwave,
radio, or
infra-red laser links. Most companies rent or lease circuits from common carriers because laying long stretches of cable can be expensive.
DQDB,
Distributed-queue dual-bus, is the metropolitan area network standard for data communication. It is specified in the
IEEE 802.6 standard. Using DQDB, networks can be up to 20 miles (30 km) long and operate at speeds of 34 to 155 Mbit/s.
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