Cisco SFP-10G-LR Compatible 10GBASE-LR SFP+ Transceiver Module (SMF, 1310nm, 10km, LC, DOM)
The 10G SFP Fiber Module works with processors containing 10G fiber output ports and
supports up to 10km link lengths over LC duplex single-mode fiber cable. Check the back of the processor to determine how many fiber modules are needed.