Black Box Mini Media Converter, RJ45 to ST, Multimode 10/100/1000 850nm

Black Box Multipower Miniature Media Converters make it easy to bring fiber to the desktop. Just connect a Miniature Media Converter to your PC's copper port with a CAT5x cable, then connect a fiber cable to the converter's other side. That's all there is to it! Best of all, you can tuck these tiny converters unobtrusively behind your PC.

The converter not only links 10- and 100-Mbps segments to fiber cabling, it also works as a data rate converter, performing 10/100 auto negotiation on the twisted-pair port.