I just bought a new ethernet card that has two troubleshooting lights on the back. One (link/Act) lights up when when connected to a network. The other (100) lights up when the card is operating at 100Mps when it is not lit the card is operating at 10Mps. Right now that led is off which means I'm operating at 10Mps. I'm connected to a cable modem (shaw@home service). Is this normal??