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Large scale concert production TCP/IP networking
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<blockquote data-quote="Henry Cohen" data-source="post: 49739" data-attributes="member: 123"><p>Re: Large scale concert production TCP/IP networking</p><p></p><p></p><p></p><p>Careful: These types of PtP systems are designed for long haul connectivity, on the order of kilometers, and mounted at a fairly decent height. Attempting to use a pair of these for a 200 foot or so link at not too far above an ocean of WiFi clients could result in far less satisfactory perfomance than one might expect.</p><p></p><p>Backhaul links are designed for both high ERP output (RF power + antenna gain) and very good sensitivity (RX front end design + antenna gain), the common characteristic being antenna gain. Positioning nodes too close together could actually result in overloading the receive stage causing tremendous distortion and rendering the data link useless. Even if the RF power could be turned down alot, the cumulative antenna gain alone is still going to provide >40dB, or over 10 watts worth. Add to that the minimum RF power the node could probably be set to (about +10dBm), the result is about 100 watts ERP; way too much power for only a couple of hundred feet.</p><p></p><p>Further, because of the very high gain of the antenna and the relatively low height the units are likely to be mounted above the ground, the noise floor encountered by the receiver [at 2.4GHz] could be quite detrimental, especially as the RF power is turned down. That said, the very narrow beamwidth of a high gain antenna means only about a 30 foot height above the crowd would be sufficient to keep the received noise floor low enough to be tolerable, and of course using a 5GHz channel would most likely be quieter still.</p><p></p><p>If you still feel you'd like to try a PtP link, I'd recommend the <a href="http://www.ubnt.com" target="_blank">Ubiquiti</a> offerings: Excellent high speed performance at 1/10th the price of Canopy/Cambrium.</p></blockquote><p></p>
[QUOTE="Henry Cohen, post: 49739, member: 123"] Re: Large scale concert production TCP/IP networking Careful: These types of PtP systems are designed for long haul connectivity, on the order of kilometers, and mounted at a fairly decent height. Attempting to use a pair of these for a 200 foot or so link at not too far above an ocean of WiFi clients could result in far less satisfactory perfomance than one might expect. Backhaul links are designed for both high ERP output (RF power + antenna gain) and very good sensitivity (RX front end design + antenna gain), the common characteristic being antenna gain. Positioning nodes too close together could actually result in overloading the receive stage causing tremendous distortion and rendering the data link useless. Even if the RF power could be turned down alot, the cumulative antenna gain alone is still going to provide >40dB, or over 10 watts worth. Add to that the minimum RF power the node could probably be set to (about +10dBm), the result is about 100 watts ERP; way too much power for only a couple of hundred feet. Further, because of the very high gain of the antenna and the relatively low height the units are likely to be mounted above the ground, the noise floor encountered by the receiver [at 2.4GHz] could be quite detrimental, especially as the RF power is turned down. That said, the very narrow beamwidth of a high gain antenna means only about a 30 foot height above the crowd would be sufficient to keep the received noise floor low enough to be tolerable, and of course using a 5GHz channel would most likely be quieter still. If you still feel you'd like to try a PtP link, I'd recommend the [URL="http://www.ubnt.com"]Ubiquiti[/URL] offerings: Excellent high speed performance at 1/10th the price of Canopy/Cambrium. [/QUOTE]
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