What is an SFP (Small Form Factor Pluggable) Port?
SFP Port on Ethernet Switch for Different Connections
Amazon.com: MokerLink 8 Port 10Gbps SFP+ Switch, Support 1G SFP and 10G SFP+, 160Gbps Bandwidth, Fanless Unmanaged Plug and Play Ethernet Switch : Electronics
RJ45 vs SFP Port: Which Should I Use to Connect Two Switches?