ComNet
Media Converter
ComNet’s CNMCSFP is a single channel universal media converter that allows the user to select 10/100Mbps transmission by changing the position of a switch on the media converter. ComNet designed this hardened media converter for applications where there is a potential upgrade to Gigabit transmission or as a universal media converter where different bandwidth consumption devices are planned. The CNMCSFP uses small form factor (SFP) devices, giving the user flexibility in terms of fiber type, connector type and distance. The CNSFPMC is made in the USA and comes with a lifetime warranty.
https://www.comnet.net/comnet-products/ethernet/media-converters/cnmcsfpm.html