Since WiFi reception on the 2nd floor is bad (max about 20 Mbit/s, but often lower because of interference), as there are reinforced concrete floors in between it and the highest floor I can get cable through for a WiFi access point.
So adapters based on the IEEE 1901 ethernet over power line standard might be an option. HomePlug compatible power line adapters seem to conform to this standard.
Any power line based communication is supposed to be sensitive in having path between the adapters that is as straight as possible (same power phase, no extension cables or converter plugs) so it a comparison with products having plugs being compatible either with they European CEE 7/7 plug (upper picture on the right), or the CEE 7/16 Europlug (lower picture on the right).
The Dutch Hardware.Info site did a comparison of 30 powerline adapters at 25 meter distance which looks promising. The review also explains a bit more on the HomePlug standard, comparison at 50 meter distance, and a separate measurement of a Devolo 500 Mbit/s powerline adapter (which is slower than the NetGear adapters).
Note that the fastest owerline adapters use about 5 watt each, even when idle. so convenience comes at a price.
The Netgear XAVB5004 is their product of choice, as only Netgear provided 500 Mbit/s equipment. So I went looking for other reviews.
SmallnetBuilder has published their test plan, some hints of avoiding noise, and published a roundup of HomePlug AV 500 compatible adapters and explains how the 500 Mbit/s powerline technology works. Their tests use USA models, and favour Belkin, D-Link, Zyxel and Trendnet over the Netgear products.
–jeroen
via: 30 powerline adapters vergelijkingstest | Hardware.Info Nederland.>
The Wiert Corner - irregular stream of stuff 
