TD-SCDMA (Time Division Synchronous Code Division Multiple Access) is an air interface found in UMTS mobile telecommunications networks in Asia as an alternative to W-CDMA. It was developed by the CATT (China Academy of Telecommunications Technology) in collaboration with Datang and Siemens to be accepted by the IT as one of the five IMT-2000 standards.
TD-SCDMA is an option for those operators who want to move from a 2G to a 3G network. Besides data transmission at speeds up to 2 Mbps, it supports circuit-switched data, such as speech and video and packet-switched data from the internet.

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