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.