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Technology Stocks : The *NEW* Frank Coluccio Technology Forum

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To: Frank A. Coluccio who wrote (21571)	5/24/2007 8:47:38 AM
From: Peter Ecclesine	Read Replies (1) of 46821

Hi Frank, Maybe Motorola's Canopy obscures their view of WiMAX ;-) >>"P2P, FSO, etc are obvious alternatives. At what additional cost (and gain) vs. using the WiMax network itself for backhaul?"<< FSO can have the problem of > 300 dB/km of path loss when fog descends. Noone likes running a link with 600 dB of path margin. TDD WiMAX (802.16d) is little better than TDD 802.11a, having more flexibility in cyclic prefix protection, but 802.11a/j/y in 5 MHz channel bandwidth has 3.2 usec (about a kilometer's worth of delay spread) multipath protection. The shipping receivers have the same sensitivity, and transmit power is limited by regulation. TDD 802.11n is silicon Spring, products Fall, with proprietary 10 MHz channel bandwidths and radar detection. The main issue is available spectrum. 5.47-5.85 GHz is 480 MHz of Part 15 spectrum that 'Wi-Fi' devices have been approved to use, there is no big outdoor block at lower frequencies. 802.11n press releases will come in the Fall, the die is cast. petere

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