iding data-optimized channels. An asymmetrical implementation, it supports up to 2.4Mbps downstream and up to 153Kbps upstream. The average rate a user experi- ences is between 300Kbps and 600Kbps. 1xEV-DO Revision A supports IP packets, increases the downlink peak rate to 3.1Mbps, and substantially boosts the uplink rate to 1.2Mbps. The latest enhancement, CDMA2000 1xEV-DO Revision B, enables operators to aggregate up to 15 1.25MHz channels to deliver 73.5Mbps throughputs and greater network efficiencies. These enhanced data rates enable services including streaming video (e.g., downloading and viewing a movie trailer or mobile soap), broadcasts (e.g., watching live TV coverage of the Olympics or World Cup), videoconferenc- ing (e.g., taking part on a videoconference call), streaming audio (e.g., MP3 music downloads), and location/traffic services (e.g., viewing real-time traf- fic and weather reports). CDMA2000 1xEV-DV (Enhanced Version-Data and Voice)-This technol- ogy integrates voice and data over the same 1.25MHz carrier as CDMA2000 1xEV-DO. It is asymmetrical, offering a peak data rate of up to 4.8Mbps downstream and up to 307Kbps upstream. The next phase of CDMA2000, CDMA2000 3X, uses three 1.25MHz CDMA channels. It is part of the CDMA2000 specification for countries that require 5MHz of spectrum for 3G use. CDMA2000 3X is also known as 3X RTT, MC-3X, and IMT-CDMA Multi-Carrier 3X. CDMA2000 3X uses a pair of 3.75MHz channels (i.e., 3 X 1.25MHz) to reach higher data rates, with the promise to support integrated voice and data up to 3.09Mbps. CDMA2000 3X has not yet been deployed. 3G: Moving Toward Broadband Wireless CDMA450 CDMA450 is a TIA/EIA-IS-CDMA2000 (CDMA-MC) system deployed at 450MHz. It includes the same family of technologies as CDMA2000. Currently, CDMA2000 1X and CDMA2000 1xEV-DO are commercially available for the 450MHz band, and CDMA2000 1xEV-DV is being developed. The advantages of CDMA450 derive from the spectral efficiency and high-speed data capabilities of CDMA2000 and the expanded cover