Hello all, I have a 6509 with a few 3750E switches that I connect with 10gig-LX4 X2 modules. We have been connecting them with MMF. I have heard that you could also connect them with SMF. As a test, I connected one of the 3750's with SMF and it worked over a distance of 320 meters. I could not find this info any where on Cisco's site. Is this an unsupported cofiguration?