This is the Data only or Data Optimised evolution for CDMA2000. As the name implies this standard is optimised for data only and can offer data rates up to 2.45 Mbps under Release 0 of the standard or 3.1 Mbps under Release A. It uses separate channels from the existing 1X standard, and if voice traffic is to be handled an “Access Terminal” capable of using 1X must be used and this is carried on a different channel to the data. The EV-DO standard is defined under IS-856.
Phase 1 evolution of CDMA2000 1xRTT where the 1.25 MHz carrier supports data only. It increases the crucial forward data rate to 2.4 Mbps. Also called IS-856.
An evolution of CDMA2000, this "data-optimized" version is also an approved 3G standard. 1xEV-DO provides peak data rates of up 2.4 Mbps in a standard 1.25 MHz CDMA channel for fixed, portable and mobile applications.