There is a big difference between the wiring for lights and for high freq data signals. There is a limit to how much copper those can travel through and still work without having to go through an amplifier to clean up and reamplify the signal. Take it from guys who have worked with this stuff most of their lives, that's why DSL is limited to certain houses, they must be within a certain copper distance of the equipment. They made it available to more houses by moving the equipment to the neighborhood vaults and feeding those with fiber, that put many more homes within the approax 333ft of copper (and I think it's actually a little more than that with current DSL tech, but the speed drops with distance, max speed is only available at the minimum distance).
The thing *I* have found working with higher level techs in troubleshooting my internet problems is that the problem isn't the wire, most of the wire in the country has FAR more capacity than is needed, it's the routers that are running at 85 to 95% capacity which as FAR overloaded as you want to run them generally no more than about 65 to 70% capacity for good performance. Any more than that and they will get bogged down and drop packets, which with internet protocols will cause severe drops in performance, far more than one would thing, as in simply dropping 1% of packets will drop performance a good 20% when downloading files because of how the system works.
The thing *I* have found working with higher level techs in troubleshooting my internet problems is that the problem isn't the wire, most of the wire in the country has FAR more capacity than is needed, it's the routers that are running at 85 to 95% capacity which as FAR overloaded as you want to run them generally no more than about 65 to 70% capacity for good performance. Any more than that and they will get bogged down and drop packets, which with internet protocols will cause severe drops in performance, far more than one would thing, as in simply dropping 1% of packets will drop performance a good 20% when downloading files because of how the system works.
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