I would like to extend an Option 11c Expansion cab. across campus. About a mile. I have an NTDK85AA Dual Port DB and a NTDK25BB Rec. card. These are multimode fiber cards. The customer installed Single mode in the middle.... I need a box that can convert this multi-mode to single mode. What is the speed out of the NTDK85 card. Is it 10/100/1000 Mbps or just a signal.