Wikipedia
The E-carrier is a member of the series of carrier systems developed for digital transmission of many simultaneous telephone calls by time-division multiplexing 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It was widely used in almost all countries outside the US, Canada, and Japan E-carrier deployments have steadily been replaced by Ethernet as telecommunication networks transition towards all IP
E-carrier - Wikipedia, the free encyclopedia