<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 26, 2016 at 5:36 PM, Mikael Abrahamsson <span dir="ltr"><<a href="mailto:swmike@swm.pp.se" target="_blank">swmike@swm.pp.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-">On Wed, 26 Oct 2016, Jan Ceuleers wrote:<br>
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What I mean is that the OLT optics become very expensive if you need to<br>
support as many lambdas as you have customers. You'd furthermore need an<br>
OLT port for much fewer customers (e.g. 1 port per 64 or 128 customers)<br>
than the thousands you can support on a (shared) GPON port on a single<br>
lambda.<br>
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That only works if your customers don't use their Internet access very much. If they do, you're in trouble and have to rebuild.<br></blockquote><div><br></div><div>Yes, and the question then becomes: How much is "very much"? This can of course be analyzed mathematically, which e.g. Google have done here:</div><div><br></div><div><a href="http://research.google.com/pubs/pub44935.html">http://research.google.com/pubs/pub44935.html</a></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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In my market, we're now in the access speeds where 100/10 is on the lower end of access, and it's not uncommon for people to have 250, 500 or 1000 downstream. If they then actually start using their bw then you'd have to rebuild to either go higher speed for some CPE (complicated and expensive), or rebuild to have smaller splitter domains.<br></blockquote><div><br></div><div>The standard answer from PON proponents (I'm not one) is to upgrade equipment, from GPON to XG-PON or NG-PON2. But upgrading hardware as bandwidth demand increases is necessary whatever the technology - what's important is the scalability of the solution.</div></div></div></div>