We had one do that in a splice case a few weeks back.  Just decided to break 
all by itself. Maybe temperature or vibrations did it.  Very visible fault with 
the VFL.

Sent from my iPhone

> On Sep 23, 2021, at 7:56 AM, Nate Burke <n...@blastcomm.com> wrote:
> 
> 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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