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10GBASE-LRM on FDDI 62.5/125um

Posted on 2015-01-14
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Last Modified: 2015-01-20
I have a section of old 62.5/125 FDDI fiber between buildings that is about 550-feet long.  I looks like I can push 10Gb/s using 10Gbase-LRM transceivers.  I don't know if I need mode-conditioning cables for this, or if there's anything else I'm overlooking that will cause problems for me.  I'm looking for good advice.
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Question by:prescott_college
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by:mikebernhardt
mikebernhardt earned 100 total points
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Just make sure the connections are clean and I think you should be OK. Fiber does degrade over time, so watch for errors the interfaces.
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Craig Beck earned 400 total points
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10G over FDDI using LRM will go about 220m so as long as it's a clean run (like mike said) you should be OK.  You will need mode-conditioning patch cables though.

Make sure that you get a pair of cores that offer similar specs in terms of TX and RX power.  If you get one good core and one bad core you could end up with what is effectively a unidirectional link and then the 10G module will just stop sending frames, bringing the link down.
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