Allied Telesis AT-MCF2012LC/1 - Manual (Page 59)

AT-MCF2012LC and AT-MCF2012LC/1 Media Converter Modules Installation Guide
59
Problem 8: A channel is operating in the Smart MissingLink
mode and the Link LEDs for both ports are blinking.
Solution: This could have several possible causes. This
can occur when a port of the channel is connected to
another media converter that also supports the Smart
MissingLink mode, forming a chain of media converters.
Media converters that support the Smart MissingLink mode
will pass the loss of a link on a port to all the media
converters in the chain. This can result in situations where
the Link LEDs on both ports of a media converter are
blinking, indicating that the source of the problem has its
origins in another media converter in the chain. To identify
the source of the problem, set the operating mode on all the
media converters in the chain to Link Test and then
examine the Link LEDs of the ports. The Link LED of the
port that cannot establish a link to its networking device will
be off.
Another possible cause is that a port is only able to form an
intermittent link with its networking device, perhaps
because of a problem with the cable or the networking
device. To identify which port in the channel is having the
problem, use the Link Test mode.
Note
If you need further assistance, please contact Allied
Telesis Technical Support. Refer to “Contacting Allied
Telesis” on page 14.