Allied Telesis AT-MC1001SC/GS4 - Manual (Page 26)

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7. If the two LNK LEDs are green but there is a communication problem
between the nodes connected to the media converter (and you are not
running a link test), do the following:
— Verify that the nodes connected to the ports are operating at 1000
Mbps.
— Verify that the nodes connected to the media converter are operating in
the same duplex mode. The media converter is transparent to the
duplex mode.
— Verify that the Link Test/MissingLink switch on the media converter
is in the M/L ON (DOWN) position.
Note
When two media converters are in a back to back topology and the
converters are not performing a link test, the LNK LEDs for the
1000Base-LX ports will remain green if a failure occurs on a connection
to either one of the 1000Base-SX ports. Additionally, the loss of a
1000Base-SX connection will cause the 1000Base-SX LED on both
media converters in the back to back topology to turn OFF. Should a
loss of connectivity occur in a back to back topology, perform a link test
using the link test mode on the two media converters. You can then use
the LNK LEDs on the media converters to identify which cable or node
has caused the problem.
If you are still experiencing problems after testing and troubleshooting the
installation, contact Allied Telesyn Technical Support. Refer to “Contacting
Allied Telesyn Technical Support” on page viii or visit our web site at
www.alliedtelesyn.com for support information.
Warranty Registration
When you finish the installation, register your product by completing the
enclosed warranty card and sending it in. You can also visit our web site at
www.alliedtelesyn.com/forms/warranty.htm and fill out the registration
online.