iMcV-LIM
9
FX LINKLOSS, TX LINKLOSS, LINK FAULT PASS-THROUGH, FAR
END FAULT, FIBERALERT
iMcV-LIM modules include the troubleshooting features FiberAlert, 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 SmartWorx 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 SmartWorx 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.
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.
