> 1. No Link between SFP-10G-LRM and X2-10GB-LX4? (cisco at entrap.de) The LX4 uses 4 lights and is only compatible with itself. We bought a handful to hook 6500s together and then found they don't make SFP+ versions and had to rebuy when we added 7K/5K to the links. They sure looked cheaper at the beginning.