AEJim:SnowyJohn:AEJim:SnowyJohn:
AEJim:I use them to stream video from the PC > wireless router > PS3 (wirelessly) > TV.
AEJim, where do the wallplugs come into play in this setup?
I'll rephrase!
PC > ethernet cable > Wallplug (on 2nd floor) > Wallplug (on 1st floor) > ethernet cable > O2 Wireless router > PS3 (wirelessly) > TV (HDMI). Phew!
Gotcha... still, you're streaming HD content (presumably from the pc which is transcoding the video) to the PS3 over a wired + G-wireless connection, 54mbps effective.
Wall plugs would no doubt introduce a lot of HF noise into system (the conductors covering the breadth of your house are after all effectively antennas), but providing the SNR (signal to noise ratio) remains high enough, I would expect little difference once the digital signal is converted. But then again, I have not experimentally investigated this at all... Switching a light switch, switching something on or plugging something in would create transients on the signal (certainly) but as to the extent of these transients - I could only guess.
Yup, I was wary of this when I bought them but aside from the aforementioned extra crackle on my (10 year old) Aego 2 volume control and touch of background hiss I've not noticed any issues. The Aego is plugged into a 4-way plug in the same outlet as the Netgear wallplugs, my Hi-Fi, while in the same room as the other wallplug was on a totally separate outlet via a more flashy 6-way Musicworks plug and exhibited no extra noise.
I've started using some Linksys Powerline homeplugs and have no problems. One adapter is plugged into a socket away from all my kit (which is plugged into two Tacimas).