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<div class="moz-cite-prefix">I'm considering specs for a new site at
the moment. Distances are likely to be < 500 m in all runs.
It seems that there are new-ish standards for both MMF & SMF :
OM4 & OS2. Should I be concerned about the differences
between them and their older counterparts? Neither OM4 nor OS2
seems to be available from Simpletech, our usual supplier for
fibre components, but their price differences between OM3 vs. OS1
and SX vs. LX SFPs are trivial.<br>
<br>
Considering the short distances and the fact that we're not
worried about having more than 10 GbE per run, is it worth
worrying about SMF? Most of our other intra-site runs are OM1 or
OM3.<br>
<br>
Thanks,<br>
Paul<br>
<br>
On 10/12/2013 06:55 PM, James Braunegg wrote:<br>
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<p class="MsoNormal"><span>MMF SFP’s are cheaper than SMF SFP’s
although it also depends on your supplier !!</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>With Finisar/ ModuleTek the delta
difference is only 20% or so in cost for 10gbit SFPs and
much less for 1gbit SFPs</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>SMF fibre vs MMF fibre patch leads
are the same price (depending on your supplier)</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I find the benefit of keeping
everything SMF is it’s the same SFP in most cases which
minimizes spares (apart from long range SFP’s)</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>Kindest Regards</span></p>
<p class="MsoNormal"><span> ...</span></p>
<p class="MsoNormal"><b><span>From:</span></b><span> Peter
Tiggerdine [<a class="moz-txt-link-freetext" href="mailto:ptiggerdine@gmail.com">mailto:ptiggerdine@gmail.com</a>] <br>
<b>Sent:</b> Saturday, October 12, 2013 6:56 PM<br>
<b>To:</b> James Braunegg<br>
<b>Cc:</b> Alastair Waddell; <a class="moz-txt-link-abbreviated" href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] Copper versus fibre in the DC</span></p>
<p class="MsoNormal"> </p>
<p>SMF for carrier to rack but I don't see any problems with MMF
inter rack. The delta between SFP cost is well worth it.</p>
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<p class="MsoNormal">On 12/10/2013 5:51 PM, "James Braunegg"
<<a moz-do-not-send="true"
href="mailto:james.braunegg@micron21.com">james.braunegg@micron21.com</a>>
wrote:</p>
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<p class="MsoNormal"><span>Dear Alastair,</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I would recommend </span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>Single mode Fibre for any rack
to rack communications , or rack to carrier
communication . </span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>Today the same single mode
fibre will run 1gbit, 10gbit, 40gbit and 100gbit … and
I’m sure it will run 400gbit in years to come and
that’s before you look at wavelength technology.</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I also find fibre has an
placebo effect on people thinking it’s more important
than copper so they take more care when touching it….</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I would only use copper for
Switch to Server communication within a rack</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>Kindest Regards</span></p>
...</div>
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