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Interference is a definite possibility... check this:
If I connect my laptop with a short cable connected to the jack outside, which is connected to another jack inside that leads to the router, I get a 100 mb network to the router and the internet just fine. Internet works and everything is "dandy"...
If I connect one end of the 80 ft. outside cable to a my 10/100 switch (no jack combo involved here, just a straight thru connection), and a laptop to the other end, I get a 100 mb network fine as well.
But once I replace the short cable with the 80 fts cable, everything goes down. Nothing works at 100mb. Even the switch will not uplink correctly.
In brief:
This works:
DSL-->Router--> cable--->Jack-->cable --> jack--> short cable
This does not work:
DSL --> Router--> cable --> jack --> cable --> jack --> 80 ft cable
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