CDMA2000 IXEV-DO (Evolution-Data Optimized)

A third-generation wireless protocol that is a stepping stone in the evolution of cdma2000. 1 XEV-DO "data optimized" is a data only overlay that uses a 1.25 MHz channel to provide a peak rate data throughput of 2.4 Mbps. EV-DO was designed as an evolution of the CDMA2000 (IS-2000) standard that would support high data rates and could be deployed alongside a wireless carrier's voice services. The back-end network is entirely packet-based, and thus is not constrained by the restrictions typically present on a circuit switched network and while the EV-DO feature of CDMA2000 networks provides access to mobile devices with forward link air interface speeds of up to 2.4 Mbit/s with Rev. 0 and up to 3.1 Mbit/s with Rev. A, the reverse link rate for Rev. 0 can operate up to 153 kbit/s, with Rev. A operating at speeds up to 1.8 Mbit/s. EVDO was designed to be operated end-to-end as an IP based network, and so it can support any application which can operate on such a network and bit rate constraints. Several Korean mobile operators have rolled out 1XEV-DO networks.