Questions, I have 3550 switch, unfortunately its the one that has 10 1000mb slots and 2 10/100/1000 slots. I just purchased a copper GBIC converter that converts 1000mb slot into RJ45 connection. Unfortunately when I try to hook up 100mb fasteth0/0 port on my 2621XM Cisco router using straight through cable to the GBIC converter on the 3550 switch I don't see the port status showing up. As the matter of fact the light doesn't even show up on the 3550 switch, neither does the light show up on the router's end. I have a feeling that I might be using the wrong cable. When connecting 1000 mb gbic on the 3550 switch to 100mb ethernet on 2621xm do I have to use some modified straight through cable and if so what are the pinouts for that?