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More MIMO mixing

I figured while I had all this stuff set up, I could haul out one more piece of gear and check out how a RangeMax client fares when it ventures onto a True MIMO AP's turf. So I substituted a Linksys WRT54GX router for the 824 and ran a mixed test with RangeMax and True MIMO (Linksys WPC54GX clients). I'll show the plots for all four combinations I tested.

Mixed RangeMax and True MIMO downlink from True MIMO AP - True MIMO first

Figure 33: Mixed RangeMax and True MIMO downlink from True MIMO AP - True MIMO first
(click on image to enlarge)

Figures 33 and 34 show a reasonable sharing of bandwidth when both STAs are running downlink. But the True MIMO AP seems to favor its own, giving the WPC54GX client more bandwidth than the NETGEAR WPN511. Even when running alone at the beginning and end of the test in Figure 34, the RangeMax client doesn't attain the peak bandwidth of the True MIMO client shown in Figure 33. This is because True MIMO uses a spatial multiplexing approach to achieve its high throughput, while RangeMax relies on Super-G's channel bonding.

Mixed RangeMax and True MIMO downlink from True MIMO AP - RangeMax first

Figure 34: Mixed RangeMax and True MIMO downlink from True MIMO AP - RangeMax first
(click on image to enlarge)

Mixed RangeMax and True MIMO uplink to True MIMO AP - True MIMO first

Figure 35: Mixed RangeMax and True MIMO uplink to True MIMO AP - True MIMO first
(click on image to enlarge)

The uplink results shown in Figures 35 and 36 show that once again the True MIMO STA gets more bandwidth. But this time the throughput of the RangeMax client is really beaten down to around 3Mbps!

Mixed RangeMax and True MIMO uplink to True MIMO AP - RangeMax first

Figure 36: Mixed RangeMax and True MIMO uplink to True MIMO AP - RangeMax first
(click on image to enlarge)

The bad uplink and better downlink True MIMO / RangeMax mixed behavior is basically the same as I observed when mixing True MIMO and Super-G STAs. So I suspect it more an interaction between True MIMO and Super-G than with the Video54 BeamFlex part of RangeMax.

The take-away from this is that RangeMax appears to do a better job of sharing bandwidth with True MIMO than vice-versa - as long as you don't get a uplinking True MIMO client too close to a RangeMax AP!

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