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Enhancements to the CDMA cellular technology that increase the number of users on a voice circuit and provides high-speed packet data. In 2000, CDMA2000 was the first 3G technology to be deployed as part of the ITU's IMT-2000 framework (see IMT-2000). By 2009, the CDMA Development Group (CDG) reported more than 440 million CDMA2000 subscribers worldwide.

CDMA2000 1x
The first version of CDMA2000 enables up to 100 callers to share a single 1.25 MHz CDMA channel and provies a peak data rate of 153 Kbps. The use of the single channel is known as "1X" or "1xRTT" (1x Radio Transmission Technology). 1X has also been known as "IS-2000," "MC-1x," and "IMT-CDMA MultiCarrier 1x."

Evolution-Data Optimized (EV-DO) technology increased the peak data rate first to 2.45 Mbps and later to 3.1 Mbps per channel, with the average user experiencing from 500 to 800 Kbps. For more details, see EV-DO. See CDMA, CDMA450, WCDMA, LTE and cellular generations.

1X Signal Strength
The "1X" is the 1xRTT signal strength on this cellphone, which is only one bar at this moment. The "EV" signal, also one bar, is the EV-DO channel. As the phone travels, the strength of the two signals may differ.

References in periodicals archive ?
Under the terms of the royalty-bearing agreement, QUALCOMM has granted Cyberlane a worldwide license under QUALCOMM's CDMA technology and patents to design and market innovative solutions for cdmaOne and third-generation (3G) CDMA (cdma2000, cdma2000 1xEV, TD-SCDMA, WCDMA) applications.
Under the terms of the royalty-bearing agreement, QUALCOMM has licensed GBase Communications certain QUALCOMM patents and technology to develop, manufacture and sell wireless infrastructure equipment for private, in-building or campus-wide network enterprise applications using cdmaOne, cdma2000 and cdma2000 1xEV technology.
Designed for CDMA cellular handset, PCS and wireless local loop applications, the CX77105, CX77106 and CX77107 power amplifier modules (PAMs) support IS95/CDMA2000 1xEV operations, as well as AMPS, Korean PCS and U.S.
Among these implementations are CDMA2000 1X and CDMA2000 1xEV.
* CDMA2000 1xEV includes two variants, both backward compatible with CDMA2000 1X and cdmaOne technologies.
Showcasing mobile IP capabilities for wireless networks, Ericsson's CDMA2000 1xEV solution illustrates how CDMA operators can efficiently and cost effectively deliver 3G mobile Internet services to their customers.
Ericsson's CDMA2000 1xEV also includes a complementary access service with Wireless LAN (WLAN).