The RUGGEDCOM i803 is a compact. fully managed Ethernet switches designed to operate reliably in harsh industrial environments. managed or unmanaged regular orextended temperature fiber optical or copper interfaces Fast or Gigabit Ethernet 56-bit Encryption Ethernet Ports 4x 10/100Tx + 1x 100FX + 2x 1000LX or 2x 100FX M = Managed with ROS U = -40 to +85 Deg. Cel. XX = Manufacturing modification none 1FX11-FX06 = 1x100FX Multimode LC 1310nm. 2km. and 2x 100FX Singlemode LC 1310nm. 20km .