This the Data and Voice evolution for CDMA2000. It supports both data and voice on the same channel and data speeds of up to 3.1 Mbps can be achieved. The system is defined under IS-2000. The first offering appears in Release C of the standard where the high data rate is only available in the downlink, the uplink allows for data at the same rate as 1X. Release D allows for the high speed data in both directions.
Phase 2 evolution of CDMA2000 1xRTT, where the 1.25 MHz carrier supports concurrent voice and data. It increases the crucial forward data rate to 3.1 Mbps.
(Evolution Data-Voice). CDMA2000 1XEV represents the second step in the evolution of CDMA2000. Recently approved by ITU as a 3G technology, will provide data and voice together on a single 1.25 MHz channel, with data rates of up to 4.8 Mbps.