What is an SFP (Small Form Factor Pluggable) Port?
Amazon.com: 100/1000BASE-T Copper SFP to RJ45 Module, Auto-Negotiation Gigabit Mini-GBIC RJ45 SFP Transceiver, Compatible for Cisco GLC-T(10/100/1000), SFP-GE-T(10/100/1000Mbps), up to 100-Meters Over Cat5e : Electronics
SFP-RJ45-GE - Fiber Media Converter
RJ45 Port vs SFP Port: Differences of Connecting Switches
RJ45 vs SFP Port: Which Should I Use to Connect Two Switches?
SFP Transceiver 1000BASE-T - AGM734
Tripp Lite USB-A 3.1 to Fiber Optic Gigabit Ethernet Adapter, Open SFP Port for Singlemode/Multimode, 1310 nm, LC - network adapter - USB 3.1 - Gigabit SFP x 1
Should you use SFP ports in a home / small office network? – MBReviews
10Gbe SFP to RJ45 Copper Module, SFP+10GBASE-T Transceiver, Mini gbic Compatible for Cisco SFP-10G-T-S, Meraki MA-SFP-10G-T, MikroTik, Unifi, Netgear, QNAP, Supermicro, Cat6a/ Cat7, 30m
An Introduction to SFP, Combo SFP, Uplink and RJ45 Ports