International Telecommunication Union (ITU)

Definition of International Telecommunication Union (ITU) in The Network Encyclopedia.

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What is IUT (International Telecommunication Union)?

An international organization headquartered in Geneva, Switzerland, that coordinates global telecommunications networks and services with governments and the private sector. Known until 1993 as the International Telegraph and Telephone Consultative Committee (CCITT), the International Telecommunication Union (ITU) is responsible for a number of important international networking and communication standards, including the following X series and V series standards:

  • X.25 packet-switching network standard
  • V.90 56-Kbps modem standard
  • X.400 message-handling system (MHS) standard
  • X.435 standard for electronic data interchange (EDI) over X.400
  • X.500 directory service recommendations
  • X.509 digital certificate and authentication standard

The ITU also hosts important study groups, meetings, and conferences and is a leading publisher of information on telecommunications technology and standards.

The section of the ITU that is concerned with developing international standards for telecommunications is called the ITU Telecommunications Standardization Sector, or ITU-T.

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