I've got my arduino ethernet shield connected to my router using ~50'-60' of cat3 four conductor telephone wire and have no issues other than the conductors are solid and have broken at the RJ45 connector after flexing a lot.
I've got my arduino ethernet shield connected to my router using ~50'-60' of cat3 four conductor telephone wire and have no issues other than the conductors are solid and have broken at the RJ45 connector after flexing a lot.