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Super-G vs. Broadcom 11g - Streaming

Super-G vs. Broadcom 11g testing consisted of taking the previous scenarios and repeating them with the Atheros-based NETGEAR pair now set to Super-G mode.

The full implementation of Super-G has both static and dynamic modes. Among the differences are that static mode devices will only talk to other Super-G devices and channel bonding is always kicked in.

Dynamic mode in an AP lets 802.11b, 11g, and Super-G STAs all associate and transfer data and switches in channel bonding only when bandwidth demands require it.

Although NETGEAR's WG511T and WGT624 have been shipping with only static Super-G capability, NETGEAR recently posted BETA dynamic Super-G code. I tried both and found little difference when running the streaming and throughput scripts, so opted to use the more recent dynamic Super-G for my testing.

First up were the streaming vs. streaming tests.

The setup:

  • Atheros-based test pair set to dynamic Super-G
  • Broadcom-based 11g test pair on channel 11
  • 2.048Mbps, UDP NetMtgv.scr running on both WLANs
  • 10 feet maximum between WLANs (both APs and STAs)
  • Broadcom-based WLAN started first, followed by Super-G-based WLAN 10 seconds later.
  • Data sent from STA to AP

Once again the throughput plot isn't very informative, so I've only shown it in Figure 18 for the 10 foot test. At 0.051%, Lost Data in the 11g stream is a little higher than the 0.041% shown in Figure 10, but, once again, doesn't represent significant performance degradation.

Figures 20 and 21 show Lost Data at 30 feet and 50 feet, coming in at 0.038% in both cases.

Conclusion:
A nearby Super-G WLAN running a 2Mbps video stream will probably not cause significant interference to an 11g WLAN that's also streaming a video.

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

Figure 18: Throughput for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 10ft
(click on the image for a full-sized view)

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

Figure 19: Lost Data % for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 10ft
(click on the image for a full-sized view)

Lost Data % for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 30ft

Figure 20: Lost Data % for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 30ft
(click on the image for a full-sized view)

Lost Data % for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 50ft

Figure 21: Lost Data % for Atheros Super-G vs Broadcom 11g - 2Mbps streams - 50ft
(click on the image for a full-sized view)

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