I have two offices next to each other. I ran two fiber lines between them. One connects to a WS-C3560G-48TS-S and the other connects to a WS-C2960G-48TC-L. The C2960's GBIC works and when I connect it, but when I connect that same connection to the 3560G it doesn't come up. Both interfaces are configured the same. I've tried the GBIC in all 4 of the 3560's ports all with the same configuration, but they don't come up.