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| E-carrier level 1 ： ウィキペディア英語版 |
E-carrier
In digital telecommunications, where a single physical wire pair can be used to carry many simultaneous voice conversations by time-division multiplexing, worldwide standards have been created and deployed. The European Conference of Postal and Telecommunications Administrations (CEPT) originally standardized the E-carrier system, which revised and improved the earlier American T-carrier technology, and this has now been adopted by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). It was widely adopted in almost all countries outside the US, Canada, and Japan. E-carrier deployments have steadily been replaced by ethernet as telecommunication networks transitions towards all IP.
== Presentation ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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