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To: DaveMG who wrote (18651)	11/20/1998 4:50:00 PM
From: w molloy	Read Replies (1) \| Respond to of 152472

IXRTT... Hi Dave - I'll touch on one or two salient points. I haven't seen the spec so what I write is conjecture 1XRTT is scheduled for publication in the first quarter of 1999 and introduces 144 kbps packet data in a mobile environment, and speeds beyond this in a fixed environment. Features available with 1XRTT are a two-fold increase in both voice capacity and standby time, more than 300 kbps data capability, advanced packet data services, as well as greatly extended battery life and improved sleep mode technology. All of these capabilities will be available in an existing cdmaOne 1.25 MHz channel. First of all IMO this is 'market speak' and should be taken with a pinch of salt. The writer has taken all the key positive features of the spec and lumped them together. The fact that some of these features are mutually exclusive doesn't matter. (Aside - CDPD did the same. All the literature talked about a 19.2kbps data pipe. In practise - it was around a third of this, because of the overhead associated with channel hopping, error correction etc.) To get 144kbps, they are going to have to lump channels together. I will be surprised if the network providers go for it. GSM is proposing the same with multi-timeslots. The writer appears to be contradictory when he suggests a data rate of 300kbps from a 144kbps packet data service. I suspect that they will specify what is called an unbalanced link, where the data rate in one direction is much less than the data rate in the other direction. He may also be referring to some other unspecified (connection oriented?) service. I don't know what the writer means by two fold increase in voice capacity.... Does he mean channels? Increased Voice capacity generally comes with degraded voice quality. As I understand that 8.5kbps voice is being quietly dropped in favour of 13.3kbps voice, I don't know how this will be achieved. I'm no longer working on CDMA so I guess I will never know... My only worthwhile contribution here is that 1.25Mhz will provide a ceiling beyond which you can't go. You can trade off Number of channels; Number of users in a cell; Number of cells; The mix of voice and data; and the quality of the voice. All these factors will be judged by the Network Provider, with an eye on the bottom line. regards w.