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EV-DO - technical definition

Also known as 1xEV-DO (one carrier EV-DO). A high data rate (HDR) version of Code Division Multiple Access 2000 (CDMA2000). Revision 0 (Rev 0) employs 16-QPSK modulation in support of a peak data rate of 2.4 Mbps on the downlink and 153 kbps on the uplink. In a fully loaded cell, 1xEV-DO supports average aggregate throughput of 4.1 Mbps on the downlinks and 660 kbps on the uplinks. 1xEV-DO can run in any band and can coexist in any type of network. Rev A supports peak speeds of 3.1 Mbps on the downlink and 1.8 Mbps on the uplink, and average speeds of 450-800 Mbps and 300-400 Mbps, respectively. Rev B, still under development, is anticipated to yield peak downlink speeds up to 4.9 Mbps per carrier, with as many as 3 carriers linked for aggregate peak downlink speed of 14.7 Mbps. See also 16-QPSK, CDMA2000, downlink, modulation, throughput, and uplink.

See EV-DO in Computer

(EVolution-Data Optimized) A 3G digital service provided by CDMA cellular carriers worldwide such as Verizon and Sprint in the U.S. EV-DO works on EV-DO cellphones as well as laptops and portable devices that have EV-DO modems. Part of the CDMA2000 standards, EV-DO users have experienced data rates up to 800 Kbps typically with more latency than DSL and cable service. EV-DO is also known as "1xEV-DO."

Revisions 0, A and B
Revision 0 of EV-DO provided a data rate of 2.45 Mbps, which was increased to 3.1 Mbps with Revision A (TIA-856 Rev. A). In addition, Revision A is based entirely on the IP protocol.

Revision B (TIA-856 Rev. B) is the "multicarrier" version and supports two or three channels (2x, 3x), which can be combined to increase the data rate for video and other high-speed requirements. There have been several nomenclature variations; for example, 3-channel EV-DO Rev. B has been called "3XRTT," "MC-3X," and "IMT-CDMA MultiCarrier 3X." See CDMA, CDMA2000, WCDMA, LTE and cellular generations.

EV-DO Signal Strength

The "EV" is the EV-DO signal strength on this cellphone, which is only one bar at this moment. The "1X" signal, also one bar, is the standard CDMA voice and text messaging channel. As the phone travels, the strength of the two signals may differ.