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To: Bux who wrote (43363)	10/5/1999 12:21:00 PM
From: engineer	Read Replies (4) \| Respond to of 152472

One thing that has not been addressed in how CDPD actually works and how it will fail if AT&T is sucessful in getting everyone to use it. CDPD is made as an overlay system to the existing analog network. what is does is watch the over the air radio signals and find call channels that are not in use. When it detects this, it then attempts to use this unsed channel for data. If another call channel comes along, then CDPD must detect this and drop off the air, even in mid packet. As the demand for bandwidth grows and the demand for data grows, these two will collide even faster than that described by BUX. CDPD works now only because it has a small following. If it is pushed to a large following and an large user base, then it will log jam not only itslef, but it would severely limit the capacity of the TDMA voice netowrk it is overlayed on. It must drop transmission during the most critical phase of a TDMA call, the data carrier timing burst. It will be itneresting to see how AT&T gets by this real limitation, if at all. Of course, they can start out with CDPD and then migrate everyone to GPRS, but then this would require new radios and hardware. That sounds expensive...