[AFMUG] Patch cable failure

[Nate Burke]

If I didn't diagnose it, I wouldn't have believed it.  1M SM fiber Patch 
cable installed in a rack between router and a switch.  Link went down 
at exactly noon.  Router had no link, switch showed link. Replaced both 
SFP's with no change.  Reversed patch cable and link came up.  Put back 
to original, no link.  Threw that cable in the garbage and put in a new 
one.  I have a camera looking at the front of this rack.  Nothing moved 
when the link went down, I can see the link light turn off on the router 
when it failed.

I never would have believed a fiber patch cable would just up and fail 
with no external force.

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