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1xEV-DO (EVDO) is a 3G standard for CDMA-based networks. As a 3G technology, it focuses on bringing high-speed data to CDMA networks.

See: 3G

EVDO provides data rates over 10 times faster than 1xRTT, the previous data technology for CDMA networks. EVDO is not as fast as the newer LTE 4G standard.

See: 1xRTT

See: LTE

In terms of data speed and general technology evolution, the closest equivalent to EVDO for GSM/WCDMA networks would be HSDPA.


Part of a family of CDMA2000 1x digital wireless standards. EVDO originally stood for "EVolution, Data-Only", but later was also referred to as "EVolution, Data-Optimized".

Unlike other proposed "1x" standards, EVDO only addresses data, not voice. It requires a dedicated radio frequency range, separate from voice networks using standards such as 1xRTT.

There are currently two main versions of EVDO: "Release 0" and "Revision A".

Release 0 (r0) is the original version, and the first to be widely deployed. Rel. 0 offers data rates up to 2.4 mbps, averaging 300-600 kbps in the real world. This is much faster than the 50-80 kbps typically offered by the older 1xRTT technology.

Revision A (rA) integrates most of the faster data technology originally designed for the 1xEV-DV Revision D standard, and improves latency. These enhancements allow features such as VoIP and video calling. The downlink (download) theoretical peak data rate compared to Release 0 is improved from 2.4 mbps to 3.1 mbps.

EVDO is based on a technology initially known as "HDR" (High Data Rate) or "HRPD" (High Rate Packet Data), developed by Qualcomm. The international standard is known as IS-856.

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