Loopback Testing - IMC Networks iMcV-T1/E1/J1-LineTerm Operation Manual

Loopback Testing

The iMcV-T1/E1/J1-LineTerm includes three Loopback test modes: Copper
Loopback, Fiber Loopback and Internal Fiber Loopback.
The following illustrations show the path that a signal takes in each of the
Loopback test modes.
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 iMcV-T1/E1/J1-LineTerm module and the
connected device, while Fiber Loopback tests can isolate problems on the fiber
connected to the module.
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).
10