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<div class="gmail_quote">On Wed, Apr 29, 2009 at 8:28 AM, John Lindsay <span dir="ltr"><<a href="mailto:jlindsay@internode.com.au">jlindsay@internode.com.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>I think you can make a very strong argument that Layer 3 is "greener"<br>which also means "cheaper to operate" on the basis of needing slightly<br>
less boxes.<br></blockquote>
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<div>Actually if you bridge on a larger scale you use fewer boxes, but imnsho that design lacks so much I won't even start.</div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">HFC networks are often operated as Layer 3 with customers even being<br>able to see their neighbours at Layer 2.<br>
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<div>Only if you do it badly. The older stuff was all bridged and really poor security wise. All the newer stuff is layer 3 and DOCSIS separates people nicely via RF encoding.</div>
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<div>You should really be able to see your neighbours, anyway. Why not use LANs like they were meant to??</div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span id=""></span><br>ADSL networks are often operated as Layer 2 with all traffic<br>encapsulated in PPP.<br>
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<div>but these are circuits and the DSLAM does all the work.</div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">But IPTV is much easier and more efficient if it's Layer 3 and ADSL<br>networks can do that too, even at the same time as encapsulating the<br>
Internet access.</blockquote></div>
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<div>loads of things are...</div>
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<div><br>-- <br><br><br>Narelle</div>
<div>on her soapbox and in a foul mood thanks to some useless airline</div>
<div><br><a href="mailto:narellec@gmail.com">narellec@gmail.com</a><br></div>