The first phase of CDMA2000 offering voice and data services. Peak data rates of 307 kbps can be achieved using a single channel and when two are used this increases to 614 kbps.
Cdma2000 1x, the next generation of CDMA, supports between 1.5 and 2 times the number of voice channels as a standard CDMA system as well as 144-Kbps packet-data services. Cdma2000 1x is 21 times more efficient than analog cellular and 4 times more efficient than TDMA networks. (Cdma2000 1x data speeds will increase from 144 Kbps to 288 Kbps by the end of 2002.)
A 3G technology which provides voice and data capabilities within a standard 1.25 MHz CDMA channel for outstanding spectral efficiency and flexibility. CDMA2000 builds on earlier CDMA technology (known as cdmaOne) to provide a simple evolution to 3G services. It nearly doubles voice capacity over second-generation CDMA networks and supports high-speed data services.