What Doug says, assuming you have "shielded" CAT5/6; the shield is over all the pairs, not individual pairs. Unshielded is probably more common (UTP, unshielded twisted pairs) since it seems to have been the original standard and is cheaper and easier to put connectors on. As noted previously, there are CAT snake boxes that use unshielded CAT cable but can only do 3 channels with P48, or 4 channels without P48. Buyer beware.