Chapter 4: Install the
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 Black Box 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.
4.3.2FX LinkLoss (FXLL)
FX LinkLoss is a troubleshooting feature. When enabled, if a fault occurs on the fiber segment of a conversation, FX LinkLoss detects the fault and passes this information to the twisted pair segment. If a media converter is not receiving a fiber link, 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.
4.3.3TX LinkLoss (TXLL)
TX LinkLoss is a troubleshooting feature. When enabled, if 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. The result is in a loss of the link on the device connected to the fiber port.
4.3.4Link Fault Pass-Through (LFPT)
Link Fault
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