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richms: We have a naked slingshot connection and a flatmates provided xtra phone and dsl on the other pair.
Slight slowdown of one connection when the other is up for the second one to sync up, so I just have to reset my router when the flatmates is off - they turn theirs off at night because the lights annoy them.
Check out your house wiring, you can probably find that upgrading to Cat5 any wiring that shares the cable with your flatmate could make an improvement.
