<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">hi Skeeve,</div><div class="gmail_quote"><br></div><div class="gmail_quote">On Thu, Jul 10, 2014 at 10:29 AM, Skeeve Stevens <span dir="ltr"><<a href="mailto:skeeve+ausnog@eintellegonetworks.com" target="_blank">skeeve+ausnog@eintellegonetworks.com</a>></span> wrote:<br>
</div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>I know you live in vendor world, but most of us live in the real world. I work in a lot of networks, SP's, Enterprise... old and new.. and I almost NEVER come across equipment with 10GBase-T ports in them. I don't even recall the last 10GBase-T port I saw - and this is on a LOT of kit.</div>
</div></blockquote><div><br></div><div>Love it that you think my world is not a real world or that you think I'm in marketing. :)</div><div>Yes I work for a "vendor" and yes I help design/build/architect ethernet switches. I'd argue that each of the vendors I've worked for doing this are 'successful' as measured by real-world tangible metrics of "revenue", "market share."<br>
</div><div>Its not possible for me to make any of this up, its a matter of public record in compliance with publicly filed documents.</div><div><br></div><div>Maybe that you haven't ever seen 10GBASE-T is a reflection of either what you recommend to your customers, or vendors you work with or their choice of compute or storage.<br>
</div><div>Certainly 10GBASE-T is a challenge on things like blade servers. A lot of my experience and what I see comes from what some of the world's largest cloud and web2.0s are doing.</div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div><br></div><div>This very much sounds like the property people saying 'The market is going to increase and values increasing!' just to justify and push up their own sales.</div></div></blockquote><div><br></div>
<div>I've pointed you at some public research but feel free to look further if you want. Market research data from Cehan, Infonetics, Dell'oro and IDC will all show this - both backwards-looking actual and forward-looking estimates.</div>
<div><br></div><div>The big advantage 10GBASE-T has is that for most people with 10/100/1000 attached devices today, they can upgrade infrastructure for some devices being 10G attached while still catering for existing 1G attached devices.</div>
<div>(of course, you could achieve that with SFP+ based switch ports that are capable of taking a 1000BASE-T SFP in them too, but its not going to be at the same price point.)</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div><br></div><div>Don't misunderstand me... I think 10GBase-T is awesome and I recommend people consider it as a TOR over SFP+ anytime they have a number of ports to justify it... but few do due to the lack of portability of 10GBase-T - meaning you need those ports wherever kit is moved to, very few people are seriously considering it as a choice to deploy.</div>
</div></blockquote><div><br></div><div>No idea what you mean by "lack of portability." Maybe that its electrical and not optical so is restricted distance of 100m?</div><div>Generally speaking, 100m distance is fine within a data center for all but the largest cloud/web2.0's who have mega-scale type problems of doing cost effective high performance networking where distances exceed 100m.</div>
<div><br></div><div>Sure - for a service provider or doing a cross-connect you'd always do that optically with SMF. But since the original poster here was talking about server connectivity I'm answering on the basis this is about server/storage connectivity inside a data centre.</div>
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<div><br></div><div>With cost, I am not talking about the SME crap... it is a hell of a lot cheaper to deploy 10GBase-T switches - the switches are a bit more expensive, but once you factor in SFP+ modules into a switch, the opticals are much more expensive.</div>
</div></blockquote><div><br></div><div>I'm making an apples/apples comparison of cost of 10G passive DAC SFP+ (10GBASE-CR) to 10GBASE-T.</div><div>Latter is most cost effective.</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div><br></div><div>I also meant to the vendor who replied about the 10GBase-T <-->SFP+ module possibility... and that making that, which would be consumed in VERY low numbers (my opinion) that the business case would be hard - for anything - made where the numbers shipping would be low.</div>
</div></blockquote><div><br></div><div>The point is moot, because from an engineering perspective, even using not-quite-yet-productized 22nm 10G-T PHYs, they don't fit in either power/heat envelope for a SFP+ (1.5W maximum) nor would physically fit inside it (die size too large.)</div>
<div><br></div><div>To give an example (this is a 40nm part), <<a href="http://www.broadcom.com/collateral/pb/84833-PB02-R.pdf">http://www.broadcom.com/collateral/pb/84833-PB02-R.pdf</a>> shows that the PHY itself is in a 25mm package and you still need the transformer/magjack piece before the RJ45.</div>
<div>Its simply not physically possible to put all those in a SFP+ package today.</div><div> </div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div><br></div><div>Re switch availability...</div></div></blockquote><div><br></div><div>There is far out there from the vendors you list.</div><div>(of course they aren't going to have it in "low end" 1G switches that you list. They're "low end" and "entry level price" for a reason..)</div>
<div><br></div><div><br></div><div><br></div><div>cheers,</div><div><br></div><div>lincoln.</div></div></div></div>