This is a mini media converter that converts a 10 100 1000base-tx rj-45 to 1000base-x via an open sfp port. The open sfp port allows users to customize between the sx. Lx. Or bx connections. This media converter provides a cost effective conversion from 10 100 1000base-tx rj-45 to 1000base-x. While extending the network reach beyond the 100m reach limitation of copper and saving space 3.75 X 2.25 X 1 . Our media converters are 100% compliant for all of our networking needs. Now you have a cost effective solution to your network upgrade needs.