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Teemu...."Current version of CDMA is IS-95A. It defines just 14.4kb circuit switched data. The next step
will be IS-95B, but it has not yet been published. That should include faster data rates (about
GPRS rates)."

Hmmm....I dont think that the cdg website was upto date. The current version of CDMA which is installed around the world is IS-95A. It allows data rates of 14.4kb (not sure if it is circuit or packet-switched). A transition to IS-95B may be done by a software upgrade to the infrastructure of a carrier. This version of CDMA allows data rates of 64kbps. This is scheduled to be rolled out by Japan by the end of the year. Next year Qualcomm will release a chipset (MSM5000) which will allow the first phase of CDMA2000. This mode is known as 1xrtt and allows 144kbps (not sure if this on both the up and down links). Carriers will have to do both a hardware and software upgrade on their basestations to allow for this mode. Another benefit to 1xrtt will be a doubling of voice capacity on existing spectrum. I wonder how much PCS will charge for voice when this is installed?

One other thing…..to allow the above data rates, the infrastructure AND the handsets need to have the right chipset. Qualcomm has been shipping the MSM3000 (which allow IS-95B) for about 9 months which allows a critical mass of users to be available when the carrier turns the new features on.

Slacker
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