Performance - Noise Immunity
While I had things set up in Location A, I also ran noise immunity (or susceptibility) tests. I used two noise sources: a compact travel hairdryer (broadband noise) ; and a halogen floor lamp with dimmer (impulse noise). For a worst-case test, I moved the tested adapters to a non-surge-protected outlet strip and plugged the noise source into the same strip.
My previous experiences had shown HomePlug AV products to be more susceptible to impulse than broadband noise. But when I started an IxChariot stream then ramped the floor lamp up and down with the dimmer, I didn't see any effect on the plot.
Using the hairdryer, however, was a different story. Figure 9 shows an almost 20% drop in throughput with the broadband noise source on. The good news is that throughput recovered within a second or so once the noise stopped.
Figure 9: Belkin broadband noise effect
With the NETGEAR pair, however, the opposite was true. Figure 10 shows an IxChariot plot for the NETGEAR adapters. The hairdryer had no observable effect on throughput when it was turned on an off during the 10 - 20 second part of the plot. But you can clearly see throughput knocked down by, again, almost 20% when the lamp dimmer was ramped up and down. Note that recovery time took seconds after the lamp was turned off.
Figure 10: NETGEAR impulse noise effect
I only ran a quick interoperability check with a NETGEAR XAV1004 and a Belkin adapter plugged into the same wall outlet in my office. Figure 11 shows I got just shy of 44 Mbps vs. the 60 Mbps obtained between the two NETGEAR HomePlug AV adapters. Not bad, but not as good as, at least the two NETGEAR adapters paired up.