jaedwards at gmail.com
Thu Nov 9 10:03:15 EST 2017
Always clean brand new patch cables.
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.
> On 9 Nov 2017, at 9:24 am, Bob Purdon <bobp at purdon.id.au> wrote:
>> Grab an optical fibre scope while you're at it. It's amazing how dirty
>> your cable ends and recepticals can actually be.
> Absolutely - even brand new cables directly out of the manufacturer's
> plastic bags can be filthy. I did have some fibre scope photos of this
>> with fibre, the major carrier datacentre operators less so - yes, they
>> did it too) as plugging SC cables into SCA recepticals or vice versa.
> This.. ..or connectors not properly mated. High attenuation. Push.
> Click. Problem solved.
>> Have you done optical loss testing? Some network gear can tell you
>> directly what your tx and rx power levels are.
> Be careful with this - while it can often be a good guide, I have seen
> many cases where the diagnostic data says the SFP is transmitting, but
> an optical power meter shows nada, zilch, zero, nuffin' (as in no light,
> /not/ 0dBm, lol). ..or the launch level is vastly below what the SFP is
> reporting it is.
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