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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