CDMA2000 (also known as C2K or IMT Multi‑Carrier (IMT‑MC)) is a family of 3G mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is developed by 3GPP2 as a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea.

CDMA2000 compares to UMTS, a competing set of 3G standards, which is developed by 3GPP and used in Europe, Japan, and China.

The name CDMA2000 denotes a family of standards that represent the successive, evolutionary stages of the underlying technology. These are:

  • Voice: CDMA2000 1xRTT, 1X Advanced
  • Data: CDMA2000 1xEV-DO (Evolution-Data Optimized): Release 0, Revision A, Revision B, Ultra Mobile Broadband (UMB)

All are approved radio interfaces for the ITU's IMT-2000. In the United States, CDMA2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA).

There are three types of CMDA2000:

  • 1xRTT doubles the capacity of cdmaOne and supports up to 144 kbps data speeds
  • 1xEV-DO supports data rates up to 2.4 Mbps but needs to be deployed in a separate spectrum. This standard doesn't support voice calls and needs to be combined with 1xRTT.
  • 1xEV-DV supports data rates of around 3-5 Mbps and voice capabilities

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