1000Mbps fiber switch to 100Mbps fiber switch - no communication

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http://serverfault.com – I went this morning to go troubleshoot a fiber connection between two switches in the same building. It was Singlemode fiber. I knew this fiber was fine because I had installed it myself and tested (with my OTDR) after installation. My customer was having an issue connecting two switches to each other using the fiber connection. We had 6 different strands to try it with going between these two rooms in this building. After hours of troubleshooting and figuring out for certain (it took much persuading and proving) that it was NOT the physical fiber connection that was the problem. We determin (HowTos)