Monday, November 22, 2010


EV-DO is a high-speed network protocol used for wireless data communications, primarily Internet access. EV-DO is considered a broadband technology like DSL or cable modem Internet services. Certain classes of cellular phones support EV-DO. These phones may be available from various phone carriers around the world including Sprint and Verizon in the U.S. Additionally, various PCMCIA adapters and external modem hardware exists to enable laptops and handheld devices for EV-DO.
The EV-DO protocol uses asymmetric communications, allocating more bandwidth for downloads than for uploads. The original EVDO Revision 0 standard supports up to 2.4 Mbps data rates down but only 0.15 Mbps (about 150 Kbps) up.
An improved version of EV-DO called Revision A increases download speeds up to 3.1 Mbps and uploads to 0.8 Mbps (800 Kbps). EV-DO providers have gradually been upgrading their equipment from Rev 0 to support Rev A.
A future version of EV-DO called Revision B (not yet widely deployed) promised to offer much higher data rates as this protocol is capable of aggregating bandwidth from multiple wireless channels. Early trials have achieved EV-DO Rev B downloads of greater than 9 Mbps.
As with many other network protocols, the theoretical maximum data rates of EV-DO are not achieved in practice. Real-world networks may run at 50% or less of the rated speeds.

CDMA2000, also known as IMT-CDMA Multi-Carrier or 1xRTT, is a code-division multiple access (CDMA) version of the IMT-2000 standard developed by the International Telecommunication Union (ITU). The CDMA2000 standard is third-generation (3-G) mobile wireless technology. The world's first 3G commercial system was launched by SK Telecom (South Korea) in October 2000, using CDMA2000 1X.
CDMA2000 can support mobile data communications at speeds ranging from 144 Kbps to 2 Mbps. Versions have been developed by Ericsson and Qualcomm. As of March 2006, the CDMA Development Group reports more than 250,300,000 subscribers worldwide.


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