But before you go off wondering why Atheros would create “an Figure 1 shows an idealized spectral plot power vs frequency of an This time both the throughput and Lost Data plots are worth showing, because you can clearly see differences in both. With current radio design technology, this means the overlapping signal has little effect on the primary i. This meant using a desktop machine and 11g USB2.

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Atheros 11g vs Broadcom 11g throughput – 10ft click on spuer image for a full-sized view Figure And while it’s true that two 11g WLANs can interfere with each other as Atheros contends, it’s only when both are running full-tilt, and even then, the interference is gone by the time the WLANs are separated by 30 feet – well short of the feet that Atheros has been quoted as saying will be the 11g interference zone.

I agheros run these tests at 30 and 50 feet, because from my previous testing, I knew the interference would be essentially gone for both tests.

So if normal This meant using a desktop machine and 11g USB2.

The yellow shaded area represents the power from channel 2’s signal that overlaps into channel 1’s main lobe the largest “hump” and also the frequency band that contains most of the signal’s power. My second set of 11g-only tests used the same products and same distances.

In it, I’ll show that looking at just Broadcom-based 11g vs. Atheros has not released its own Super-G White paper. Atheros-based test pair set to dynamic Super-G Broadcom-based 11g test pair on channel 11 Throughput.

So I first wanted to test to see if this were true. Throughput for Atheros 11g vs Broadcom 11g – 2Mbps streams – 10ft click on the image for a full-sized view Figure But the interference is essentially gone at 50 feet.

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It appears that even if a dynamic Super-G AP doesn’t detect “normal” 11g or 11b clients in range, it will fall back to normal 11g on a periodic basis. Due to the buffering and error recovery mechanisms built into streaming protocols, it’s difficult to directly correlate a Lost Data number to the number and severity of glitches in a streaming video.

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Now if all the energy of the transmitted signal actually were contained within a 20 or 22MHz toyal, the definition of “non-overlapping” might be simpler. These results would seem to more strongly support Broadcom’s assertions than Atheros’ counter-arguments, since under most of the same test conditions, two 11g WLANs don’t interfere with each other, but Super-G and 11g WLANs do.

Throughput for Broadcom 11g 2Mbps stream vs Atheros 11g throughput – 10ft click on the image for a full-sized view Figure With current radio design technology, this means the overlapping signal has little effect on the primary i. The amount of overlap between the normal 11g and Super-G signals would have more clearly illustrated if all had been plotted at the same distance so that all peak signal levels were equal, but this is what Atheros supplied.

As you can see, Nitro, Xpress and Super-G all use some form of packet-bursting, which speeds things up by removing the pause to check for 8022.11 stations that may want to send data that normally occurs between packets.

Atheros Super-G NeedToKnow – Part 1 – SmallNetBuilder

The issue the amount of overlap. It’s unlikely you’d be significantly bothered by a neighbor’s heavily used Note, though, that most of the loss comes from one glitch in the stream that occurs shortly after the throughput script starts running. Both Atheros and Broadcom were kind enough to supply spectrum analyzer screen shots that will help show what real Figures 20 and 21 show Lost Data at 30 feet and 50 feet, coming in at 0.


So that I don’t get accused of playing favorites, Figure 5 shows a similar spectrum analyzer screen shot supplied by Broadcom.

Something else is hitting the ,er, fan, though, in the form of a controversy stirred up by rival WLAN chipmaker Broadcom during the recent Las Vegas Comdex show. A different implementation of dynamic Super-G in D-Link Super-G enabled gear used by Broadcom in its testing showed the timing to be seconds of Super-G and 75 seconds of 11g.

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Among the differences are that static mode devices will only talk to ssuper Super-G devices and channel bonding is always kicked in. But it’s safe to say that lower Lost Data numbers are better than higher, and using Lost Data as a measurement is a hell of a lot easier than trying to describe how a video is breaking up!

The ink had hardly dried on the Atheros 11g vs Broadcom 11g throughput – 30ft click on the image for a full-sized view Figure Our cookies track login status, but we only allow admins to log in anyway, so those don’t apply to you. Since the athdros from each signal doesn’t magically stop at the 22MHz channel boundaries, there is still overlap between “non-overlapping” channels. Under similar range and bandwidth demand conditions, Super-G signals can have a greater degree of overlap into channel 1 and 11 than a normal 11g channel 6 signal.

This isn’t really very significant, especially since the largest disturbance is due the glitch caused by the Broadcom driver.