Metropolitan Area Networks (MAN)

A Metropolitan Area Network (MAN) is a network with a size greater than a LAN but smaller than a WAN. It normally comprises networked interconnections within a city that also offers a connection to the Internet. A MAN typically covers a geographical area ranging from 5 to 50 kilometers, making it ideal for connecting multiple offices, campuses, or buildings across a city.

Distinguishing Features of MAN

• Network size − Generally ranges from 5 to 50 km. It may be as small as a group of buildings in a campus to as large as covering an entire city.

• Data rates − Data transfer rates are moderate to high, typically ranging from 100 Mbps to 1 Gbps depending on the technology used.

• Ownership − A MAN is either owned by a user group or by a network provider who sells service to users, rather than a single organization as in a LAN.

• Resource sharing − It facilitates sharing of regional resources such as databases, servers, and internet access across the metropolitan area.

• Uplink capability − MANs provide uplinks for connecting LANs to WANs and the Internet, acting as a bridge between local and wide-area connectivity.

How MAN Works

A MAN connects multiple LANs within a city or metropolitan region using high-capacity backbone links such as fiber optic cables. Each LAN connects to the MAN backbone through routers or switches, and the MAN backbone in turn connects to a WAN or the Internet through a gateway.

Examples of MAN

• Cable TV network − Cable television infrastructure often spans an entire city and is commonly used to deliver both TV and internet services.

• Telephone networks − Telephone networks providing high-speed DSL lines across a metropolitan area.

• IEEE 802.16 (WiMAX) − A wireless standard that provides high-speed broadband access with Internet connectivity to customer premises across a city-wide area.

MAN vs LAN vs WAN

Conclusion

A Metropolitan Area Network bridges the gap between LANs and WANs by connecting multiple local networks across a city or campus. It is commonly implemented using cable TV infrastructure, DSL lines, or WiMAX technology, and plays a key role in enabling regional resource sharing and Internet connectivity for organizations spread across a metropolitan area.