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Joined: Oct 2006
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I installed a fiber cable between the old exitising equipment room and the new addition in the small school addition I'm working on. Was very careful with everything: pulling the cable, routing it and connecting to the bulkhead in the fiber tray. Great. In the last fiber tray, I thought I had everything tied down properly. I opened the tray one last time and closed it. Something felt wrong. When I looked, the fiber had a very bad bend in it. I would call it a kink. I thought for sure the fibers had to be broken.
My switches with fiber transceivers had not arrived yet, so I couldn't test it with the data switches. Getting desperate, I had my helper hold an led flashlight up to the connectors. At the other end (225 feet) I was able to see light!
What a relief!
Jim
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Joined: Mar 2005
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Merry Christmas! You've been given a gift.
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Seeing light through the fiber is a long way from verifying that there's not a problem. If it was kinked during installation there's a good possibility that it now has microscopic cracks which will expand in time and cause problems. You could run a loss test on it to see how bad it is right now, but even that isn't a sure thing. Microscopic cracks can test marginally OK initially, but get worse as time goes on, like a rock ding in your windshield. The safe bet would be to re-terminate.
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Joined: Mar 2001
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I would wait for your switches and hook it up and see what happens. We've used existing fiber that looked pretty beat up and "abandoned" but had light--and it worked fine. That's not to say that tomorrow it won't go belly up---Robhub is right on about that---but I always figure---if it works good, what the heck?? Fuzzy also has a point--it may be a gift!!
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Joined: Jun 2004
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I don't do fiber, but I suspect that shining a flashlight thru it is something akin to checking CAT6 with a continuity tester - you can tell that there are no breaks or shorts, but are far from certifying it for gigabit data transfer.
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Joined: Dec 2004
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True, BUT......If you use a ruby red laser light (or LED) and shined it through....if red - good. If pink - troubles.
Good Luck.
Ken
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Joined: Oct 2006
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Voice/Data & Cable Contractors, Avaya/Lucent, Nortel and Panasonic Serving Central Fl
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Remember the wave length is in nanometers in the red range....
Ken
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Joined: Oct 2006
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I'll give the red laser a try. Hope a laser pointer will work.
But I do think it would be prudent to re-teminate. Still waiting for one last switch to ship to test it out with actual data. If it works for a short term, I can at least schedule the maintenance. I pulled a spare cat 6 copper cable at the same time, so I can use that as a backup while the fiber gets fixed.
Jim
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last time I saw that was 2 96 strand fiber. light yes. Data only on 12 strands.
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