B&B Electronics 850-18100--27 - Manual - Manual (Page 18)

15
Loopback Testing
The IE-iMcV-T1/E1/J1-LineTerm, TP/SFP includes three Loopback test modes:
Copper Loopback, Fiber Loopback and Internal Fiber Loopback.
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 IE-iMcV-T1/E1/J1-LineTerm,
TP/SFP module and the connected device, while Fiber Loopback tests can isolate
problems on the fiber connected to the module.