TAPE LIBRARY PROBLEM
As I understand it, the SNC is basically a Fibre/SCSI Bridge... and what you are seeing is the FC light being on means that the SNC is connected to the Fibre SAN... but there drives aren't connected to the bridge. Check out http://downloads.quantum.com/scalar/S24/omUsersGuideSNC4000.pdf for information on how to connect to the SNC and run the discovery process. You'll most likely have to connect via serial connection, and the document I included does a great job of discribing that process. I'd suggest that you request an IP Address from your IT folks beforehand, so that you can configure it on your IP Network whaile you're at it.