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In page UMTS:
"UMTS-TDD, an acronym for Universal Mobile Telecommunications System (UMTS) – time-division duplexing (TDD), is a 3GPP standardized version of UMTS networks that use UTRA-TDD.[1] UTRA-TDD is a UTRA that uses time-division duplexing for duplexing.[1] While a full implementation of UMTS, it is mainly used to provide Internet access in circumstances similar to those where WiMAX might be used.[citation needed] UMTS-TDD is not directly compatible with UMTS-FDD: a device designed to use one standard cannot, unless specifically designed to, work on the other, because of the difference in air interface technologies and frequencies used.[citation needed] It is more formally as IMT-2000 CDMA-TDD or IMT 2000 Time-Division (IMT-TD).[2][3]
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