CISCO SFP DS-SFP-FC8G-SW
The Cisco Small Form-Factor Pluggable (SFP), Enhanced SFP (SFP+), and X2 devices are hot-swappable transceivers. The transceivers plug into Cisco MDS 9000 Family director switching modules and fabric switch ports. They allow you to choose different cabling types and distances on a port-by-port basis
