B&B Electronics 850-18610 - Manual - Manual (Page 9)

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FX LinkLoss, TX LinkLoss, Link Fault Pass-Through, Far End
Fault
IE-iMcV-2xLIM, TX/SFP modules include the troubleshooting features, TXLL, FXLL,
FEF and LFPT that help locate silent failures on a network. Before attempting to
install the module(s), understand how these features work and react to a specific
network configuration.
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 FEF and LinkLoss allows this information to be obtained, even
when physical access to a remote device (and its link integrity LED) is not
available.
FX 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, and the TXLL LED will blink.
TX 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. This results in a loss of the link on the device connected to the fiber
port, and the FXLL LED will blink.