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Evolution-Data Optimized or Evolution-Data only, abbreviated as EV-DO or EVDO and often EV, is one telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access. It is classified as a broadband technology, because it uses a broad band of radio frequencies. It employs multiplexing techniques such as CDMA (Code division multiple access) as well as Frequency division duplex (FDD) to maximize the amount of data transmitted. It is standardized by 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world � particularly those previously employing CDMA networks (as opposed to GSM networks). The EV-DO feature of CDMA2000 networks is significantly faster than the Enhanced Data Rates for GSM Evolution (EDGE) used by GSM networks. It provides access to mobile devices with air interface speeds of up to 2.4 Mbit/s with Rev. 0 and up to 3.1 Mbit/s with Rev. A. High-Speed Downlink Packet Access (HSDPA), a competing technology for Wideband Code Division Multiple Access (W-CDMA), along with the new Qualcomm Rev A modems have the ability to maintain both circuit switched voice and packet data calls from the same radio; this functionality is not available in Qualcomm Rev. 0 chipsets.
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