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To: wonk who wrote (2893)	2/17/1999 1:45:00 AM
From: Bernard Levy	Read Replies (1) \| Respond to of 12823

Hi ww Thanks for the ISM vs MMDS correction, and for pointing out the 2 MMDS channels I missed. I still remain skeptical about the suitability of MMDS for broadband wireless. The CAI filing you quote does not make any sense (not too surprising given where the company ended up). It is not reasonable to expect 20,000 users can be squeezed into a cell. Assuming 1 Mb/sec per user, which is what ADSL-Lite offers, and that only 50% of users are connected at any given time, this implies an information carrying capacity of 10 Gb/sec per cell. I just don't see how this can be achieved realistically in the 100MHz available in the 2.5-2.6Ghz band, even allowing for the 2 times frequency usage per cell CAI claimed. Even 264-QAM would not do it. On the other hand, an assumed use of 100kb/sec per user can be sustained, which is more like an ISDN type of service, but not ''broadband'' in the sense of the usages (streaming video) customers are likely to request in the coming 5 to 10 years. Nevertheless, the MMDS frequencies represent an attractive piece of spectral real estate which is terribly used at the current time, except possibly for Bell South's exploitation of these frequencies. Best regards, Bernard Levy