We inherited a 4510 switch with dual SupV and are trying to connect them to a 3845 router. I purchased WS-5483 (copper GBICs) to accomplish this but they aren't working. From everything I've read, these should work fine with these supervisors and the version of IOS that's running on them. The problem is that they are not getting a link. I know on the router, there is a command to specify media type. Am I missing something in the configuration on either the switch or router that would cause these links not to work? Basically have the uplink port on the switch set to a switchport but that's about the only configuration on the port. Any ideas?