Definition of metropolitan area network

The typical application of MAN is broadband MAN, which is a multimedia communication network with high bandwidth, multi-function and multi-service access based on IP and ATM telecommunications technology, with optical fiber as transmission medium and integrating data, voice and video services.

Broadband MAN can meet the growing demand of government agencies, financial insurance, schools, companies and enterprises, especially the rapidly developing Internet users for high-speed and high-quality data communication services.

The development of broadband MAN has gone through a long period, from traditional voice services to image and video services, from basic audio-visual services to various value-added services, from basic services of 64 kb/s to leased line services of 2.5 Gb/s and 10 Gb/s, etc. With the development of technology and the increasing demand, the types of business are constantly developing and changing.

At present, the gradual improvement of urban broadband metropolitan area network in China has brought a lot of convenience to our lives. High-speed Internet access, video-on-demand, video calling, network TV, distance education, teleconferencing and so on are all kinds of Internet applications that we are using, and it is MAN that plays a great role behind them.

Local area network or wide area network usually serves a unit or system, while metropolitan area network serves the whole city rather than a specific department.

The construction of local area network or wide area network includes two aspects: resource subnet and communication subnet, while the construction of metropolitan area network mainly focuses on communication subnet, which also includes two aspects: one is the urban backbone network, which is connected with the backbone network of China. The second is the urban access network, which connects all local users with the urban backbone network.