You know, it just might be the angle of the polish on the ends of the SFP
and cable that line up just enough to attenuate the signal. IDK, but if I
had a cable like that, I think I would pull out my kitchen shears and chop
it into little pieces.
--
bp
part15sbs{at}gmail{dot}com
On Wed, Oct 27, 2021 at 10:43 AM Nate Burke <n...@blastcomm.com> wrote:
> I think it must be the fiber demons, same cable run just failed again.
> Replaced SFP's with no change, changed 1M patch cable again and that fixed
> it. One side was showing 40db loss on the RX according to the SFP Stats.
> Was working fine until suddenly it wasn't.
> On 9/30/2021 4:37 PM, Chuck McCown via AF wrote:
>
> First real computer class. We had to buy a floppy. I bought one, thought
> I would never fill it.
>
> *From:* Bill Prince
> *Sent:* Thursday, September 30, 2021 3:11 PM
> *To:* af@af.afmug.com
> *Subject:* Re: [AFMUG] Patch cable failure
>
>
> Kind of like the 5-1/4" floppies of yesteryear. If all the tolerances line
> up the wrong way, they technically could not work.
>
>
>
> bp
> <part15sbs{at}gmail{dot}com>
>
> On 9/30/2021 1:36 PM, Adam Moffett wrote:
>
> Heh, "fiber demons."
>
> A few months back I swapped a cable between an old Cisco X2 card and a
> patch panel and the port wouldn't link up. Cleaned and checked everything,
> ran the OTDR, tried another cable, nothing worked.
>
> Then I put the old patch cable back in and it linked right up. Switched
> back and forth, tried the new patch cable on a different interface.
> Everything checks out except this one port won't link unless this one cable.
>
> I still don't know what that's all about. Maybe the port and the
> connectors are both at the same extreme end of dimensional tolerances.
>
> ....or maybe it's those "fiber demons" you mention.
>
> -Adam
>
>
>
>
> On 9/30/2021 4:08 PM, Nate Burke wrote:
>
> Put the patch cable on the VFL, nothing showed up. Light came out the
> other end, no spots along the cable unless I bent it tight. I'll just mark
> it up to the fiber demons.
>
> On 9/28/2021 7:47 AM, Josh Luthman wrote:
>
> 100% chance the VFL finds something. Light is light - be it a red blinker
> or SFP blink.
>
> Josh Luthman
> 24/7 Help Desk: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
>
> On Thu, Sep 23, 2021 at 10:10 AM Nate Burke <n...@blastcomm.com> wrote:
>
>> Maybe I should go pull it out of the garbage and put the VFL on it to
>> see if there's anything
>>
>> On 9/23/2021 9:05 AM, Chuck McCown via AF wrote:
>> > 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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>> >> AF@af.afmug.com
>> >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>>
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>>
>
>
>
>
>
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