High performance Fiber Link Ethernet Extenders provide 
  up to 120KM of Ethernet extension over single-mode fiber. 
  The Model FS-1100 is ideal for campus networks, connecting 
  remote LANs, and facilitating the optical last- 
  connection to the metropolitan-area network (MAN) and beyond. 
  It provides a cost effective plug-and-play solution for 
  long-range 10Base-T or 100Base-TX Ethernet extensions and 
  added benefit of 10/100M auto-negotiation, making it the 
  perfect choice when planning future upgrades of 10Base-T 
  networks. Ethernet Fiber converters are ultra-miniature 
  in size and feature a shielded RJ45 Ethernet jack, SFP 
  style fiber-optic connections. Built-in auto-sensing 
  capabilities enable full or half-duplex Ethernet 
  operation with no configuration required! 
  http://www.sopofiber.com