RJ-45 to Fibre Optic (ST) Ethernet Converter.
The ECR10 range of converters is used for conversion of 10Base-T to Fibre 10Base-FL standards.
 

 
ECR10RST RJ-45 to Fibre Optic (ST) Ethernet Converter.
Ethernet Full Duplex Copper to Fibre Media Converter with ST or SC Fibre Connections. Available in both Mulitmode and Singlemode variations.
 

 
ECR10R BNC to RJ-45 Ethernet Converter
The ECR10R is an ethernet transceiver, designed to provide cost effective, high performance communication links for connecting UTP and thin ethernet network segments.