![]() Rev-A downloads have a theoretical maximum of 3174 kbps and upload speed is a theoretical maximum of 1843 kbps. Rev-0 download speeds have a theoretical maximum of 2457 kbps and upload speed is capped at 155 kbps. The main difference as far as we’re concerned is maximum speeds. EVDO coverage currently consists of two ‘revisions’ - Rev-0 and Rev-A. The “faster stuff” is known as EVDO which means “EVolution-Data Optimized” and you can read a lot more about the technology itself at this Wikipedia entry. Most people will get about 50-140 kbps as they travel in 1xRTT coverage areas. ![]() Weaker signal from a tower as well as network load on that tower, can both result in slower speeds. By comparison, a dial-up connection on old phone lines in a rural area will typically provide 20-30 kbps, so 1xRTT is at best 5-6 times faster than dial-up. 1xRTT connectivity from the major US carriers is limited to a peak of 144 kbps (kilobits per second). 1xRTT means “1 times Radio Transmission Technology” and you can learn a lot of technical detail about it at this WikiPedia entry. Two types of CDMA networks are currently in use by these carriers: the “slow stuff” is called 1xRTT and is also known as NationalAccess. Sprint, Verizon and Alltel are the major carriers who use CDMA technology for their cellular data service. I’ll explain the pros/cons of tethering vs. Who makes it available? Each of the major cellular carriers offers internet/data access and there are two methods to make it work: tethering to a cellphone/handset/PDA, or using a dedicated data device like an ‘aircard’ or ‘USB modem’ that would normally be attached to a computer, allowing that computer to have internet access.
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