IMC Networks iMcV-Giga-FiberLinX-II - Manual (Page 49)

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Troubleshooting LinkLoss/FiberAlert/Link Fault Pass-Through
The following diagrams show you how the different troubleshooting configurations for
the iMcV-Giga-FiberLinX-II.
The iMcV-Giga-FiberLinX-II also sends out link pulses from its copper and fiber
transmitters, but normally has no way of knowing whether the cable to the other
device is intact and the link pulses are reaching the other end. The combination of
FiberAlert and LinkLoss allows this information to be obtained, even when physical
access to a remote device is not available.