troubleshooting Question

Inter Floor Fiber Connect help

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netcmhFlag for United States of America asked on
NetworkingNetworking Hardware-OtherNetwork Management
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I have a pair of AT-MC101XLs. These are Fast Ethernet 100BASE-TX to 100BASE-FX (ST) Multi-Mode Fibre (2km), Stand-Alone Media Converters. Details can be found at

I am trying to connect 2 floors together. I understand that the building fiber conduit is a straight through. However, when I attempt to test the connection from a laptop connected by ethernet to this media converter to another laptop connected by ethernet to the other media converter, I can't seem to get them to work.

The connection diagram is attached.

I understand that for this to work, I need to cross the fibers. Meaning Rx from one floor should go to Tx of the other floor.

I've tried swapping cables to ensure that it's not the cables. With only being able to test with the fibers coming from the media converter to the fiber panel, here's what my tests have given me:

Destination host unreachables when fibers not crossed.
Request timed out when fibers crossed.

I understand that in this situation, the Request timed out is a better error than the Destination host unreachable one.

I'm sure this is a simple fix, but I seem to be overlooking it. Any second set of eyes to help me along my way would be very appreciated.

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