I'm looking to hook up a WS-2960-24TC-L running IOS 12.2.(rev 44) to a Catalyst 4507 on a WS-4448-GB-SFP card. I'm using two GLC -LH-SM SFP's to connect across 62.5 m Multimode Fiber. The distance is around 1200 feet, so I'm using mode conditioning patch cables to span this distance. I've had the fiber tested, everything checks out, I've switched out the SFP's to verify that they are working correctly. I've tried different ports on the 4507 as well. Any ideas on where my problem might lie? Any help at all is appreciated, I need this up very soon.