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1.4.4 Link Fault Pass Through Function
When this function is enabled, a link fault detected on the TP port will
force a link down on the FX port. Similarly, a link fault detected on the FX
port will also force a link down on the TP port. As illustrated in the
following figure, this function allows to pass TP link fault to the remote
link partner and makes the converter like a TP cable extender.