B&B Electronics 850-18510 - Manual - Manual (Page 8)

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can cause functioning units to appear flawed or even non functional.
Link Integrity
During normal operation, link integrity pulses are transmitted by all point-to-
point Ethernet devices. When an IMC Networks 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 IMC Networks 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.
TX LinkLoss (TXLL)
TX LinkLoss is a troubleshooting feature. When a fault occurs on the twisted pair
segment of a conversion, TX LinkLoss detects the fault and passes this
information to the fiber segment. If a media converter is not receiving a twisted
pair link, TX LinkLoss disables the transmitter on the media converter's fiber port.
This results in a loss of the link on the device connected to the fiber port, and the
TXLL LED will blink.
FiberAlert (FA)
FiberAlert minimizes the
problems associated with
the loss of one strand of
fiber. If a strand is not
available, the IMC Networks
device at the receiver end
notes the loss of link. The
device will then stop transmitting data and the link signal until a signal or link
pulse is received. The result is that the link LED on BOTH sides of the fiber
connection will go out indicating a fault somewhere in the fiber loop. Using