<div dir="ltr">This should be pretty simple... $vendor NIC with $vendor switch should just work for the most part. <div>Why are you using fiber + SFPs for this? Get yourself some 10G DAC cables and it will just work. </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 8, 2017 at 6:03 PM, John Edwards <span dir="ltr"><<a href="mailto:jaedwards@gmail.com" target="_blank">jaedwards@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Always clean brand new patch cables.<br>
<br>
There is a specific exception for some cable systems designed to be installed at heights while wearing rigging gloves, the kind of environment where a cleaning attempt could make things worse. In that case, the manufacturer warrants a consistent lab-tested dB loss from gunk on the ends of new patch leads.<br>
<span class="HOEnZb"><font color="#888888"><br>
John<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
> On 9 Nov 2017, at 9:24 am, Bob Purdon <<a href="mailto:bobp@purdon.id.au">bobp@purdon.id.au</a>> wrote:<br>
><br>
><br>
>> Grab an optical fibre scope while you're at it. It's amazing how dirty<br>
>> your cable ends and recepticals can actually be.<br>
><br>
> Absolutely - even brand new cables directly out of the manufacturer's<br>
> plastic bags can be filthy. I did have some fibre scope photos of this<br>
> somewhere...<br>
><br>
>> with fibre, the major carrier datacentre operators less so - yes, they<br>
>> did it too) as plugging SC cables into SCA recepticals or vice versa.<br>
><br>
> This.. ..or connectors not properly mated. High attenuation. Push.<br>
> Click. Problem solved.<br>
><br>
>> Have you done optical loss testing? Some network gear can tell you<br>
>> directly what your tx and rx power levels are.<br>
><br>
> Be careful with this - while it can often be a good guide, I have seen<br>
> many cases where the diagnostic data says the SFP is transmitting, but<br>
> an optical power meter shows nada, zilch, zero, nuffin' (as in no light,<br>
> /not/ 0dBm, lol). ..or the launch level is vastly below what the SFP is<br>
> reporting it is.<br>
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