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GlobespanVirata 11g vs. Super-G

So with the same equipment - but this time the NETGEAR Super-G products set to dynamic 108 (Super-G) mode - I re-ran my tests.

This time the Super-G vs. 11g streaming tests at 10 feet showed 0.004% lost data (1 datagram), as shown by Figures 7 and 8. The same test run with Broadcom-based 11g gear showed 0.051% lost data.

I also repeated that test at 30 feet with the same 1 lost datagram result, so didn't bother testing at 50 feet.

Throughput for Atheros Super-G vs GlobespanVirata 11g - 2Mbps streams - 10ft

Figure 7: Throughput for Atheros Super-G vs GlobespanVirata 11g - 2Mbps streams - 10ft
(click on the image for a full-sized view)

Lost Data % for Atheros Super-G vs GlobespanVirata 11g - 2Mbps streams - 10ft

Figure 8: Lost Data % for Atheros Super-G vs GlobespanVirata 11g - 2Mbps streams - 10ft
(click on the image for a full-sized view)

Maximum Throughput

Running both Super-G and GlobespanVirata 11g WLANs at maximum throughput was much more interesting, however.

Figure 9 shows that even at 10 feet, the two WLANs played very nicely together, with average throughput around 16 and 19Mbps for the GlobespanVirata and Atheros-based WLANs, respectively.

When compared to the previous test shown in Figure 10 that pits Super-G vs. Broadcom 11g, you can finally see the dynamic part of Super-G at work.

Throughput for Atheros Super-G vs Intersil 11g - 10ft
Figure 9: Throughput for Atheros Super-G vs GlobespanVirata 11g - 10ft

(click on the image for a full-sized view)

Throughput for Atheros Super-G vs Broadcom 11g - 10ft

Figure 10: Throughput for Atheros Super-G vs Broadcom 11g - 10ft
(click on the image for a full-sized view)

Super-G's adaptive capability is shown more clearly in Figure 11. This plot shows the same test conditions as in Figure 9, except that the Super-G test pair is started first, followed by the GlobespanVirata 11g pair 10 seconds later.

The Super-G pair starts out around 30Mbps, but ratchets down to around 18Mbps a few seconds after the 11g pair starts up. You can even see the Super-G pair's throughput drop below the 11g pair's toward the latter part of the test.

I also ran tests at 30 feet and obtained similar results.

Throughput for Atheros Super-G vs GlobespanVirata 11g - 10ft

Figure 11: Throughput for Atheros Super-G vs GlobespanVirata 11g - 10ft
(click on the image for a full-sized view)

Mixed Streaming and Throughput

The last test, which simulates Broadcom's Comdex demo, also turns in a very different result when run with GlobespanVirata-based products. Figures 12 and 13 show essentially no interaction between the Super-G WLAN running at maximum throughput and the GlobespanVirata-based wireless network 10 feet away.

The interesting thing about this test is that even though the Super-G throughput stays up around 35Mbps, the Lost Data plot shows the 2Mbps stream's performance is unaffected.

Throughput for GlobespanVirata 11g 2Mbps stream vs Atheros Super-G throughput - 10ft

Figure 12: Throughput for GlobespanVirata 11g 2Mbps stream vs Atheros Super-G throughput - 10ft
(click on the image for a full-sized view)

Lost Data % for GlobespanVirata 11g 2Mbps stream vs Atheros Super-G throughput - 10ft

Figure 13: Lost Data % for GlobespanVirata 11g 2Mbps stream vs Atheros Super-G throughput - 10ft
(click on the image for a full-sized view)

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