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I seem to recall running the the AC power near the network cable can cause interference. The longer they run parallel to each other the worse it is. The coupling noise is exponential, so a small separation makes a big difference. Not sure if what I did was meaningful, but I ran AC 220V buried 18" deep in a PVC conduit, then laid in bricks on top, as spacers, then laid another conduit for the computer cable. They are separated by ~4". My trench is about 50' long.