High Rate Packet Data System is the official name of the packet data system associated with cdma2000®. However, at the 3GPP2 standards committee, the name used to describe the system was 1x Evolution Data Only, or 1xEV-DO, a name that has been attached to this system throughout the industry.
1xEV-DO requires a network operator to dedicate a single CDMA channel (1.25 MHz) exclusively to packet data traffic. The system uses the same chip rate and emission filters as are used in cdma2000 and IS-95 CDMA systems, so it is spectrally identical to the legacy systems.
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