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IIRC, they're doing OFDM - so you're no longer limited to having one
device transmitting at a time like you were with the older units -
they can split the available 500mbps down to say 128mbps out of unit
1, 192mbps out of unit 2, and 192mbps out of unit 3. I'm not sure
if you're still limited to half duplex though - one would hope
not.. That they claim to be getting 500mbps out of 46MHz of
bandwidth, is rather impressive.. I'm guessing that with it
extending up to 68mhz, you'd have to be in an area which *didn't*
have Analogue TV reception, to get the full 500mbps..?<br>
<br>
I know the Belkin 200mbps units that I have sitting on a shelf here
only managed to *just* hold up ~50mbps in our last house (with about
8m between them..).. But totally dropped out every time my PSK31 rig
sent a beacon on 14MHz! - and would take ~5 minutes to re-sync after
that. Which is why they're sitting on a shelf ;) That said, I had
some of the original 14Mbps units - and they did a 30m run for 5
years with no problems at all, before a lightning strike took out
one of the units..<br>
<br>
A couple of links:<br>
<a href="http://en.wikipedia.org/wiki/OFDM">http://en.wikipedia.org/wiki/OFDM</a><br>
<a href="http://en.wikipedia.org/wiki/IEEE_1901">http://en.wikipedia.org/wiki/IEEE_1901</a><br>
<a href="http://en.wikipedia.org/wiki/HomePlug">http://en.wikipedia.org/wiki/HomePlug</a><br>
<br>
Cheers,<br>
<br>
DG<br>
<br>
On 21/02/2012 8:37 AM, Skeeve Stevens wrote:
<blockquote
cite="mid:CAEUfUGPTT4UopxhOA9k8+8=y0m8UtVOwZ90Koee5=3Mt50X6aQ@mail.gmail.com"
type="cite">Hey all,
<div><br>
</div>
<div>Re: <a moz-do-not-send="true"
href="http://media.netcomm.com.au/public/assets/pdf_file/0012/89886/NP504-Spec-Sheet.pdf">http://media.netcomm.com.au/public/assets/pdf_file/0012/89886/NP504-Spec-Sheet.pdf</a></div>
<div>
<br>
</div>
<div>Does anyone know conceptually how these things work?</div>
<div><br>
</div>
<div>At home I have hard core walls where wireless is practically
useless, so a while ago I installed the 100mb version of the
Netcomm power line devices. My life has been happy every since,
albeit at 100mb - which is a bit poopie.</div>
<div><br>
</div>
<div>I will be buying the above to get more speed to the server I
access at home which isn't in my office, but…. I wanted to know
if anyone understood HOW these things actually work.</div>
<div><br>
</div>
<div>In an ethernet environment you have a cable, it speed is
dedicated to that cable.</div>
<div><br>
</div>
<div>But these devices are not point-to-point - but maybe they
communicate that way?. At home I have them in 4 different rooms,
and they all talk to the server… but I don't know how, or, most
importantly, how well these units operate.</div>
<div><br>
</div>
<div>If these new devices are 500Mbps - what does that mean. Does
it mean on a point-to-point link with only two of them, it is
500Mbps. What happens when you add a third, fourth or fifth
unit.</div>
<div>
<br>
</div>
<div>So… (A) being the main unit in the lounge with the server
attached, and (B) being home office 1, (C) being home office 2
and (D) being bedroom (we have a Boxee box! ;-)</div>
<div><br>
</div>
<div>I guess the question is, what is the speed when B,C,D are all
talking to A, and what is happening is A and B are talking and C
and D are talking - do they 'interfere' with each other? </div>
<div><br>
</div>
<div>If they are on the same power circuit, using the same
'frequency' (I don't know what it is called) - or is it like
wireless - with channels or… ok, I am doing my head in.</div>
<div><br>
</div>
<div>I'm really interested to know how these work, because I could
see them being useful in that running 500Mbps for up to 200m
could be a very interesting last ditch, or interim solution in
the right situation.</div>
<div><br>
</div>
<div>I am sure people here have had some experience with these
kinds of things. They claim they 'just work' and given I have 4
of the units at home with never a single problem or bit of
config done, I can attest to that.</div>
<div><br>
<div>
<div style="font-family:Calibri,sans-serif">
<div style="font-size:14px"><span
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<p
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font:normal
normal normal 13px/normal Calibri">
<b>Skeeve Stevens, CEO</b></p>
</font></span></div>
<div style="font-size:14px"><span
style="font-size:13px;font-family:Calibri">eintellego
Pty Ltd</span></div>
<div><span style="font-size:13px;font-family:Calibri"><a
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Phone: 1300 753 383 ; Fax: (+612) 8572 9954</p>
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style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font:normal
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The Experts Who The Experts Call</span></div>
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<br>
<pre class="moz-signature" cols="72">--
Damien Gardner Jnr
VK2TDG. Dip EE. GradIEAust
<a class="moz-txt-link-abbreviated" href="mailto:rendrag@rendrag.net">rendrag@rendrag.net</a> - <a class="moz-txt-link-freetext" href="http://www.rendrag.net/">http://www.rendrag.net/</a>
--
We rode on the winds of the rising storm,
We ran to the sounds of thunder.
We danced among the lightning bolts,
and tore the world asunder
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