IMC Networks E1 User Manual
14
Loopback Testing
The IE-iMcV-T1/E1/J1-LineTerm, TP/SFP includes three Loopback test modes: Copper
Loopback, Fiber Loopback and Internal Fiber Loopback.
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).
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.
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.