Copper Loop back connector

Copper Loop back connector
Copper loopback plugs are connectors used for diagnosing transmission problems. It plugs into a port, such as a serial or parallel port, and crosses over the transmit line to the receive line so that outgoing signals can be redirected back into the computer for testing. Available T1 & E1 RJ48c loopback and Ethernet Loopback.
We can't find products matching the selection.