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www.thavinci.za.net: Wireless Search on This Topic:    [ Go to Home | Select a New Topic ] 4 Simultaneous Channels Okay For 802.11b   Wireless  thavinci writes "Although this is old news its often not well known, so ive transloaded it to my site.... " Note: Last summer, before starting here at Ziff Davis Media, I did some work with a small 802.11b startup called Cirond. The following story is based on a white-paper analysis done by CTO Mitch Burton. After I read it, I wanted to tell the world. I'll make no claims on whether Cirond's forthcoming products are useful, but its Channel Overlap analysis is exciting. But in the interest of full disclosure, note that they did pay me for some of the work I did – although that was almost six months ago. So take this story with the proverbial grain of salt. I find it exciting, you may not. " " Current thinking in the 802.11b wireless space is that only three of the 11 channels used by wireless hubs in the US can be allocated simultaneously. But that's wrong, according to Mitch Burton, CTO of Cirond Networks. In fact, 4 of the 11 channels in North America, and 5 of the 13 in Europe can be safely used without significant interference or crosstalk – and this has significant ramifications for multi-access point deployments. In North America, the 802.11b spectrum ranges from 2400MHz to 2483MHz, and is divided up into 11 channels from 2412MHz to 2462MHz, spaced 5MHz apart. Thus However, each channel is 22MHz wide, so as you can imagine, there is great overlap. Channel 1, for instance, is centered at 2412MHz, but extends out from 2401MHz to 2433MHz. Channel 6 is centered at 2437MHz, extending from 2426MHz to 2448MHz. In a multi-access point installation, where overlapping channels can cause interference, dead-spots and other problems, Channels 1, 6 and 11 are generally regarded as the only safe channels to use. Since there are 5 5MHz channels between 1 and 6, and between 6 and 11, or 25MHz of total bandwidth, that leaves three MHz of buffer zone between channels. Note that wireless access points generally radiate waves in a sphere around the access point, attenuated by walls, cubicle material, ceilings and floors. With just three channels to work with, it can become difficult to deploy wireless access around a single or multi-floor location while only reusing those 3 frequencies" Here is the whitepaper to substatiate this.... Whitepaper " Wednesday, December 05 @ 14:12:58 SAST   (Read More... | 187 comments | Score: 0)    Wireless Security Live CD Distributions   Wireless  thavinci writes "Grabbed of a site a list of wireless security live CD distrubutions. Would be fantastic if someone could give reveiws on them. Check them out at.... http://www.thavinci.za.net/Downloads/WiFi_Live_CDs_v1107.pdf " Wednesday, December 05 @ 13:20:10 SAST   (Read More... | 164 comments | Score: 0)    Defcon WIFI Shootout   Wireless  New world record for unamplified wireless networking!! 125 miles! "Loaded for bear." That quaint phrase means that you have the biggest, baddest gun, loaded with the biggest, baddest bullet, because you may have to shoot a big, bad bear. It indicates that you have gone all out in an effort to be prepared for any situation. "Loaded for bear" describes perfectly a team of determined young college students calling themselves "iFiber Redwire," who, with parents, family and friends in tow, traveled from Cincinnati, Ohio to a rugged desert area near Las Vegas, Nevada to compete in the 3rd Annual Defcon Wifi Shootout Contest. The contest challenges teams to wirelessly connect two computers at extreme distances using the radio technology known as "WiFi," and, on July 30, 2005, the efforts of iFiber Redwire paid off in an impressive way. After part of the team drove a trailer loaded with equipment to Utah Hill, near Beaver Dam in the state of Utah, iFiber Redwire used a fascinating collection of homemade antennas, surplus 12 foot satellite dishes, home-welded support structures, scaffolds, ropes and computers to wirelessly connect to their comrades who were located southwest of Las Vegas at the top of Mount Potosi. The final result was a full 11 Mbps data transfer rate over a distance of 125 miles, a new world record for an unamplified wireless networking connection. ---------- Read more at : http://www.wifi-shootout.com Thursday, July 19 @ 21:07:01 SAST   (Read More... | 117 comments | Score: 0)

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