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HSDPA

HSDPA is a protocol for cellular telephone data transmission. Also sometimes referred to as 3.5G technology, High-Speed Downlink Packet Access provides faster download rates than current 3G phone networks, equal to that of ADSL lines in a home. Multimedia offerings from carriers and third parties such as streaming music and video will be easier to access over faster cell networks, with HSDPA's theoretical upper limit of 14.0 Mbps transfer rate and with current offerings from AT&T and T-Mobile currently supporting up to 3.6 Mbps downloads. The HSDPA protocol is used only for downlink; a separate part of the High-Speed Packet Access family, HSUPA, is dedicated to uplink of information.

HSDPA networks are still nascent and currently being rolled out in US markets. AT&T offers existing service on their HSDPA network which covers most major metro markets, while T-Mobile lags behind in their HSDPA rollout. T-Mobile's HSDPA network was launched in New York City in May of 2008, with a slew of major cities slated to receive the new network service by the end of the year.

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