Broadcoms Test Results
According to Broadcom, when an access point and client are communicating in SuperG mode, the wireless traffic drowns out or interferes with any other 2.4GHz wireless traffic, including other Wi-Fi networks, Bluetooth mice and keyboards, wireless phones, baby monitors and so on. To prove the point, Broadcom streamed a DivX version of "The Matrix," encoded at 2Mbps, between a Broadcom-based, 802.11g enabled PC and Gateways Connected DVD Player. The two devices were set to communicate on Channel 1.Broadcom then started blasting as much traffic as possible between an Atheros-based hub and notebook, configured for Super G, sitting right next to the Broadcom-based DVD Player and access point. After a few seconds, the movie pixelated and stopped playing. On the oscilloscope, it was easy to see that the SuperG devices were taking up quite a bit of the 2.4GHz bandenough to bleed into the areas reserved for channels 1 and 11. "An 802.11g jammer", said David Cohen, senior product marketing manager at Broadcom, referring to the Atheros products. Although all the wireless products were sitting within a foot of each other, Broadcoms tests show a similar effect at up to 30 feet awaywhich could spell trouble for anyone living next door to unsuspecting D-Link and Netgear customers opting for the fastest speeds. And thats a problem, according to Cohen, who sees potential for big problems. He wants a warning label, at least, slapped on D-Link and Netgears boxes. "Consumers should understand that when you buy a technology, it interferes with other wireless products." "I think thats something we should seriously consider," responded Bradley Morse, senior vice president for Marketing for D-Link, "but we have to do more thorough testing." Next page: What D-Link found in its tests.
Using an oscilloscope, I could plainly see the traffic occurring in the lower third of the 2.4GHz band.