Loopback Testing
The
The following illustrations show a typical progression of Loopback tests (i.e., starting by checking the copper segment at the local side, then the fiber segment at the REMOTE side, etc).
Each Loopback performs the following:
•Copies the incoming signal back out to the origin while continuing to transmit this signal downstream.
•Blocks upstream data from transmitting on the looped data line.
Loopback testing is useful for troubleshooting problems with network connections should they occur. Looping received data back onto the transmit path helps determine whether a connection is still valid. Copper Loopback tests isolate problems on the copper run between an
14