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11g vs. 11g - Streaming and Max. Throughput

My last set of 11g-only tests mixes the two scenarios by running the streaming script on the Broadcom-based WLAN and the throughput script on the Atheros-based.

The details:

  • Atheros-based test pair set to "normal" 802.11g, channel 6
  • Broadcom-based 11g test pair on channel 11
  • Throughput.scr running on Atheros-based WLAN, TCP protocol, 200,000 Byte file size, no delay between sends, unlimited data rate
  • 2.048Mbps, UDP NetMtgv.scr running on Broadcom-based WLAN
  • 10 feet maximum between WLANs (both APs and STAs)
  • Broadcom-based WLAN started first, followed by Atheros-based WLAN 10 seconds later.
  • Data sent from STA to AP

This test is intended to emulate the Broadcom Comdex demo (except that it uses two 802.11g WLANs) and determine the level of interference on a video stream from a nearby WLAN that's running as fast as it can go.

The throughput plot for the stream in Figure 16 is significantly more spiky than Figure 9 and the Lost Data plot confirms a higher Data Loss of 0.107%, vs. the 0.041% lost in the stream vs. stream test.

Note, though, that most of the loss comes from one glitch in the stream that occurs shortly after the throughput script starts running.

I didn't run these tests at 30 and 50 feet, because from my previous testing, I knew the interference would be essentially gone for both tests.

Conclusion for round 3:
It's unlikely you'd be significantly bothered by a neighbor's heavily used 802.11g WLAN while watching a wirelessly streamed video on your own.

With the 11g vs. 11g testing out of the way, I moved on to the main event - Super-G vs. Broadcom 11g!

Throughput for Broadcom 11g 2Mbps stream vs Atheros 11g throughput - 10ft

Figure 16: Throughput for Broadcom 11g 2Mbps stream vs Atheros 11g throughput - 10ft
(click on the image for a full-sized view)

Lost data for Broadcom 11g 2Mbps stream vs Atheros 11g throughput - 10ft

Figure 17: Lost data for Broadcom 11g 2Mbps stream vs Atheros 11g throughput - 10ft
(click on the image for a full-sized view)

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