I agree with everything you wrote, jaclaz. I used to get all wrapped up in these things but haven't seen them cause any real-world problems in so long that I rarely go back to these principles of length/interference/attenuation/etc. For the average person using decent cables and modern equipment, he should be fine. Not optimal, but fine. The fine vs. optimal point is one to consider. WIth modern equipment negotiating a slower speed for slow/noisy links it is common to see reduced throughput in such scenarios. But when grandpa's A/B/G/N wifi link negotiates down to B due to a noisy environment...well his email will still load just as fast. (excuse the wifi example, I'm too tired and lazy to rewrite )