Copper Loop back plugs

Copper Loop back plugs
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.
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