This page describes EVDO basics,types and features of EVDO Rev. 0, EVDO Rev. A and EVDO Rev. B. EV-DO stands for Evolution-Data only and EVDV stands for evolution data and voice.1x refers to same RF bandwidth as used in IS-95 standard. 1x also means 1xRTT or 1 times Radio Transmission Technology.

EV-DO was the 1st High Speed broadband standard for mobile communication in the world.

EV-DO Rev.0 was first introduced mobile user experienced about 400-600 Kbps of avg. downlink throughput. It provides about 4 to 10 times faster than data rate compare to CDMA-2000 version.

EV-DO Revision-A features

- EVDO Rev. A does improvement in both uplink and downlink performance
- Increase in the capacity
- Low latency application support for example VOIP(About 49 calls/sector), video telephony & games
- 3.1 MBPS peak data rate on the downlink(DL) and 1.8 MBPS peak data rate on the uplink(UL)
- Lower end to end call connection delay

EV-DO Revision-B features

- With EV-DO Rev. B one can achieve higher data rates compare to Rev. A
- Support for multiple carriers
- Improvement in performance on cell boundary

Useful Links

CDMA Tutorial   GSM Tutorial   GSM mobile originated call flow   GSM Mobile Terminated Call flow 
GSM protocol stack   GSM physical layer   GPRS protocol stack   GPRS tutorial  

RF and Wireless Terminologies