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Get info about the Encyclopedia of Networking and Telecommunicatons, 3rd edition (2001)
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| CCITT (Consultative Committee for International Telephony and Telegraphy)Related Entries Web Links New/Updated Information Tìm kiếm a.viettingame.vn (powered by FreeFind)Note: Many topics at this site are reduced versions of the text in “The Encyclopedia of Networking and Telecommunications.” Tìm kiếm results will not be as extensive as a tìm kiếm of the book”s CD-ROM.The CCITT is part of the ITU (International Telegraph Union), which has a history that stretches back to 1865. In that year, 20 countries agreed to standardize telegraph networks. The ITU was set up as part of the agreement to work on subsequent amendments. In subsequent years, the ITU got involved with telephony regulation, wireless radiocommunications, and sound broadcasting. In 1927, the union was involved in allocating frequency bands for radio services, including fixed radio, mobile radio (maritime and aeronautical), broadcasting, and amateur/experimental radio.
Chúng ta đang xem: Ccitt là gì
In 1934, the union changed its name to the International Telecommunication Union to more properly define its role in all forms of communication, including wire, radio, optical, and electromagnetic systems.After World War II, the ITU became a special agency of the United Nations and moved its headquarters to Geneva. Also at this time, it made mandatory the Table of Frequency Allocations, which allocates frequency bands for each radio service. This table is meant to avoid interference between aircraft and ground communications, car telephones, maritime communications, radio stations, and spacecraft communications.Then, in 1956, two separate ITU committees, the CCIF (Consultive Committee for International Telephony) and the CCIT (Consultive Committee for International Telegraphy) were joined to create the CCITT to more effectively manage the telephone and telegraph communications.In 1993, the ITU went through a reorganization. The ITU-T is the ITU”s Telecommunications Standardization Sector. Two other main sectors formed at this time were the Radio communications Sector (ITU-R) and the Telecommunications Development Sector (ITU-D). The CCITT was integrated into this new structure.Even though the ITU-T now creates recommendations and standards, the CCITT recommendations are still mentioned quite frequently, but they should be referenced as now being managed by the ITU. Tìm kiếm a.viettingame.vn (powered by FreeFind)
lvàgt;CCITT (Consultative Committee for International Telephony and Telegraphy) (a.viettingame.vn term)