StarTech.com RJ45 Coupler 5-Pack, Inline Cat6 Coupler, Female to Female (F/F) T568 Connector, Unshielded Ethernet Cable Extension - RJ45 Cat6 Coupler 5-Pack is ideal for multiple setups; T568B Pinouts; 1/2.5/5/10G and 10/100 networks with PoE; Insertion Loss margin of 35.4dB exceeds industry standards; Supports 10BASE-T/100BASE-TX/100BASE-T4/1000BASE-T/2.5GBASE-T/5GBASE-T