IT Infrastructure

Infrastructure
is the basic physical and organizational structures needed for the operation of a society or enterprise or the services and facilities necessary for an economy to function. The term typically refers to the technical structures that support a society, such as roads, water supply, sewers, power grids, telecommunications, and so forth. Viewed functionally, infrastructure facilitates the production of goods and services; for example, roads enable the transport of raw materials to a factory, and also for the distribution of finished products to markets. In some contexts, the term may also include basic social services such as schools and hospitals In military parlance, the term refers to the buildings and permanent installations necessary for the support, redeployment, and operation of military forces.

Types of infrastructure

The following list is limited to capital assets that serve the function of conveyance or channelling of people, vehicles, fluids, energy or information, and which take the form either of a network or of a critical node used by vehicles, or used for the transmission of electro-magnetic waves. Infrastructure systems include both the fixed assets and the control systems and software required to operate, manage and monitor the systems, as well as any accessory buildings, plants or vehicles that are an essential part of the system.

Transportation infrastructure

Energy infrastructure

Water management infrastructure

Communications infrastructure

  • Telephone networks (land lines) including switching systems
  • Mobile phone networks
  • Cable television networks including receiving stations and cable distribution networks
  • Internet backbone, including high-speed data cables, routers and servers as well as the protocols and other basic software required for the system to function
  • Communication satellites
  • Undersea cables
  • Major private, government or dedicated telecommunications networks, such as those used for internal communication and monitoring by major infrastructure companies, by governments, by the military or by emergency services
  • Pneumatic tube mail distribution networks

Waste management facilities

Earth monitoring and measurement networks

Note that certain systems or facilities that are similar to infrastructure are not included in this list because they are essentially services performed by people (commuter bus services, garbage collection services, emergency services) or they are facilities that are not necessarily part of or in the form of a network (parks, sports facilities), or they are essentially privately-owned industrial plants that do not necessarily depend on a fixed distribution network (oil refineries). However solid waste disposal facilities were included because they are often the critical nodal points of a network-like public service (garbage collection), and are usually publicly owned or heavily regulated. Telecommunication systems are included if their function is limited to the conveyance of information (telephone system), but not if their function includes supplying the content of that information (TV or radio networks).

References:
http://en.wikipedia.org/wiki/Infrastructure