B&B Electronics 850-14300--39 - Manual - Manual (Page 15)

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• Redirects the incoming signal back out to the origin
while continuing to transmit downstream.
• Blocks downstream data from arriving 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. Remote loopback tests
isolate problems on the coax run between an iMcV-DS3/E3/STS
module and the connected device, while local 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 coax segment
at the local side, then the coax segment at the remote
side, etc).