Manufacturer: Allen-Bradley / Rockwell AutomationAllen-Bradley 1783-SFP1GLX Stratix Fiber Optic SFP Transceiver, 1000Base-LX/LH Single-mode Fiber SFP Transceiver for Stratix 5700 /6000 /8000 /8300 Series Managed Switches, SFP Type (Small Form-factor Pluggable), 1000 Mbit, 1310 nm Single-mode Fiber (SMF)