About Fiberalert And Linkloss - IMC Networks McBasic TX/FX Installation Manual

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Whether you are using crossover or straight-through CAT5 twisted pair
cabling, McBasic TX/FX will support both types of connections by one of
the following methods:
AutoCross: McBasic TX/FX (-50) includes AutoCross, a feature which
automatically selects between a crossover workstation or pass-through/
repeater hub connection depending on the connected device.
NOTE: The MDI/MDI-X button is NOT required on this model.
MDI/MDI-X Switch: McBasic TX/FX (-30 and -40) feature a push button
switch, located next to the RJ-45 connector, for selecting the type of con-
nection. A pass-through connection is selected when the push-button is
pushed IN. To select a crossover connection the button should be in the
OUT position. If you are unsure of the type of connection, set the push but-
ton to a position that makes the twisted pair LNK (link) LED glow.

About FiberAlert and LinkLoss

McBasic TX/FX comes with the following troubleshooting features:
FX LinkLoss (a.k.a. "Fiber LinkLoss" or "LinkLoss")
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TX LinkLoss (a.k.a. "Twisted Pair LinkLoss" or "Reverse LinkLoss")
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FiberAlert
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LinkLoss and FiberAlert are advanced troubleshooting features that can
help you locate "silent failures" on your network. However, it is vital that
you understand exactly how FiberAlert and LinkLoss work, and how they
will react in your network configuration, before attempting to install the
enclosed module(s).
Installing modules without understanding the effects of LinkLoss
and FiberAlert can cause perfectly functioning units to appear
flawed or even dead.
If you are unfamiliar with LinkLoss and FiberAlert, IMC Networks strong-
ly encourages you to read the following information. Contact IMC Networks
technical support at (800) 624-1070 (U.S. and Canada), +32-16-550880
(Europe) or techsupport@imcnetworks.com for more information/assistance.
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B O U T I N K
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 com-
ing from that device is intact. The appropriate "LINK" LED is lit to indicate
this. The IMC Networks media converter also sends out link pulses from its
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