KTI Networks KCD-400 Series - Manual (Page 11)

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1.3 Special Functions
Auto MDI/MDI-X Function
This function allows the copper port to auto-detect the twisted-pair sig-
nals and adapts itself to form a valid MDI to MDI-X connection with the
remote connected device automatically.
Link Fault Pass Through Function
When a link fault is detected on the copper port, the device will force a
link down on the fiber port immediately. Similarly, a link fault detected on
the fiber port will also force a link down on the copper port. As illustrated
in the following figure, this function allows to pass copper link fault to
the remote link partner and makes the converter like a twisted pair cable
extender.