A loopback plug is used to test serial ports, USB ports and network ports. Most commonly you will see network loopback plugs for fiber and ethernet. Loopback plugs reflect signals making it possible to verify that an electrical signal is successfully transmitting between two endpoints.
Learn More
AI Generated Content may display inaccurate information, always double-check anything important.
What is a loopback plug used for?
How does a loopback plug differ from a cable tester?