B&B Electronics 855-12840--49 - Manual - Manual (Page 11)

7
Link Integrity
During normal operation, link integrity pulses are transmitted by all point-to-
point Ethernet devices. When an B&B Electronics media converter receives valid
link pulses, it knows that the device to which it is connected is up and sending
pulses, and that the copper or fiber cable coming from that device is intact. The
appropriate “LNK” (link) LED is lit to indicate this.
The B&B Electronics media converter 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 (and its link integrity LED) is not
available.
FO/FX LinkLoss
FO/FX LinkLoss is a troubleshooting feature. When a fault occurs on the fiber
segment of a conversion, FO/FX LinkLoss detects the fault and passes this
information to the twisted pair segment. If a media converter is not receiving a
fiber link, FO/FX LinkLoss disables the transmitter on the media converter's
twisted pair port. This results in a loss of link on the device connected to the
twisted pair port.
TP/TX LinkLoss
TP/TX LinkLoss is another troubleshooting feature. When a fault occurs on the
twisted pair segment of a conversion, TP/TX LinkLoss detects the fault and passes
this information to the fiber segment. If a media converter is not receiving a
twisted pair link, TP/TX LinkLoss disables the transmitter on the media converter's
fiber port. This results in a loss of link on the device connected to the fiber port.