EVDO

EVDO stands for Evolution-Data Optimized, a high-speed wireless data standard used on CDMA2000 networks. Developed by Qualcomm and standardized by 3GPP2 as IS-856, EVDO was designed to provide broadband-like data services over mobile networks, delivering always-on IP connectivity for web, email, and multimedia applications. It is part of the CDMA2000 family and coexists with other CDMA2000 technologies such as 1xRTT, serving as the data-focused component of the 3G evolution.

The EVDO air interface supports packet data with data-driven scheduling, flexible throughput, and quality of service features to support various applications. Early implementations, known as Rev. 0, offered peak downlink speeds around 2.4 Mbps with uplink near 153.6 kbps. Subsequent revisions improved performance: EV-DO Rev. A provided higher downlink and uplink rates (approximately 3.1 Mbps downlink and 1.8 Mbps uplink) along with lower latency and better support for voice and data convergence. EV-DO Rev. B added even higher capacities, with multi-carrier and MIMO enhancements enabling downlink speeds around the mid-teens of Mbps and uplink in the single-digit Mbps range, depending on network deployment.

Deployment and legacy: EVDO was widely deployed in North America, Asia, and other regions by carriers such as Verizon Wireless and Sprint in the United States, among others, as a primary 3G data technology before the transition to LTE. While many networks have migrated to or augmented with LTE and newer standards, EVDO remains in service on some legacy networks and rural deployments, continuing to support data services where 3G CDMA2000 coverage persists.