The quantity of overlap amongst the conventional 11g and Tremendous-G indicators would've additional clearly illustrated if all were plotted at a similar length so that every one peak sign concentrations ended up equal, but That is what Atheros equipped.
The ink experienced barely dried around the 802.11g common when wireless chip manufacturers started to roll out non-conventional throughput “enhancement” technologies.
Atheros has stated that Broadcom is harping on one thing frequent to all 802.11g solutions and that interference will even be created by “ordinary” 802.11g WLANs working in close proximity. So I initial wished to check to see if this were being legitimate.
Something else is hitting the ,er, admirer, though, in the shape of a controversy stirred up by rival WLAN chipmaker Broadcom in the modern Las Vegas Comdex exhibit.
Because Broadcom utilized a 2Mbps MPEG stream as part of their Comdex demonstration, I also preferred to incorporate streaming as Element of my screening. But I desired a evaluate a lot more quantitative than striving to explain the degree of jerkiness in the streaming video clip on the Matrix.
Broadcom’s shot in Figure 7, while, shows a complete-power Super-G signal overlapping into drawn-in markings for channels 1 and 11 so that you’re sure to see that the Super-G signal is basically at comprehensive strength when it initial overlaps into the two “non-overlapping” channels.
This test is intended to emulate the Broadcom Comdex demo (besides that it works by using two 802.11g WLANs) and figure out the level of interference on a movie stream from a nearby WLAN that’s working as rapid as it might go.
Determine nine displays the throughput plot with the exam, which doesn’t definitely show you A great deal. The blip close to the conclude of the examination appears in many tests and is particularly a result of a periodic scan accomplished as Component of Broadcom’s driver.
Chariot doesn’t include things like MPEG streams among the its check scripts. So I had to make do utilizing the NetMtgv.scr script, which emulates a NetMeeting two.1 Online video stream. I utilized UDP because the protocol and set the stream rate to 2.048Mbps.
Neither is Super-G’s “quickly frames” function – which inserts many data packets into a single info body – because it’s also Element of the 802.
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And when it’s correct that two 11g WLANs can interfere with one another as Atheros contends, it’s only when both are running complete-tilt, and in many cases then, the interference is absent by the point the WLANs are divided by thirty ft – effectively short of the 100 ft that Atheros has been quoted as declaring will be the 11g interference zone.
As I explained in my Comdex coverage, the shorter story is that Broadcom is asserting superg168 that Atheros’ Super-G dependent solutions will interfere with neighboring 802.11b and g networks, severely restricting their speed and, sometimes, shutting them down fully.
But before you go off asking yourself why Atheros would develop “an 802.11g jammer” – to estimate one particular Broadcom advertising exec, as an alternative to a brand new common in wi-fi LAN efficiency, go on on to Element 2 of this Need To find out.