i would assume is faulty. one thing to note is that some switches will not work with 538A wiring standard. all wires you buy in the store now for straight through cables are tia538B standard. its rare to find an item that does not function with the A but it does happen. the reason this can occure is 538A is meant to cover phone and data on one wire, thus the pinout is a bit different. either way its most likley a bad switch.