Just purchased a new X440 - G2 switch and Extreme 1GB LX SFPs. I am not able to get the SFPs to work in the shared ports (using port 47/48). Is there something I need to do activate those ports to work with the SFPs? I've tried different Single Mode patch cables as well as different ports/switches on the other end. I know those have worked in the past. Ideas? ALso, can I plug these SFPs into the 10GB ports on the back of the switch?