On Fri, 12 Oct 2001, Bob Miller wrote: > Christopher Allen wrote: > > GPRS is now live in Eugene. > What is the data rate? "Theoretical maximum speeds of up to 171.2 kilobits per second (kbps) are achievable with GPRS using all eight timeslots at the same time."
This is from: http://www.gsmworld.com/technology/yes2gprs.html#1a ...which further notes that, "Achieving the theoretical maximum GPRS data transmission speed of 172.2 kbps would require a single user taking over all eight timeslots without any error protection. Clearly, it is unlikely that a network operator will allow all timeslots to be used by a single GPRS user. Additionally, the initial GPRS terminals are expected be severely limited- supporting only one, two or three timeslots." It was opined on the wear-hard (wearable computing hardware) list that this initial rollout is going to achieve max speeds of only 28K to 50K. The link above, apparently written a couple of years ago, puts average transmissiion speeds at initial rollout at 56K and to increase to the ultimate average of 112K when the network matures. Anyway, this is exciting news, but CDPD is still in the game as far as ubiquitous connection options go. CDPD offers flat rates and, more importantly, we *know* CDPD sucks, whereas the suckage of GPRS is unresolved at this point. :) > Is it symmetric? I'll have to get back to you on that. -Chris
