[clug] Zodiac FX OpenFlow switch on Kickstarter
Bob Edwards
Robert.Edwards at anu.edu.au
Tue Jul 28 02:28:55 UTC 2015
On 28/07/15 12:11, David Austin wrote:
>
>
> On 28 July 2015 at 11:38, Bob Edwards <Robert.Edwards at anu.edu.au
> <mailto:Robert.Edwards at anu.edu.au>> wrote:
>
> On 28/07/15 11:26, David Austin wrote:
>
>
>
> On 28 July 2015 at 10:20, Bob Edwards <Robert.Edwards at anu.edu.au
> <mailto:Robert.Edwards at anu.edu.au>
> <mailto:Robert.Edwards at anu.edu.au
> <mailto:Robert.Edwards at anu.edu.au>>> wrote:
>
> At the BeerSIG last Thursday (prior to CLUG), the Zodiac FX
> low-cost
> OpenFlow SDN switch Kickstarter project was discussed and
> several
> of us signed up for one. They are coming from a Melbourne-based
> outfit called Northbound Networks.
>
> https://www.kickstarter.com/projects/northboundnetworks/zodiac-fx-the-worlds-smallest-openflow-sdn-switch
>
> $79 incl. postage for a 4-port (3 + 1) 10/100Mbps OpenFlow
> switch.
>
>
> We can't see both sides of the PCB but we can see quite a lot and it
> does not appear that they have correctly laid out the
> differential pairs on
> the PCB.
>
> David
>
>
> A reasonable observation. I would definitely care about that if it were
> GigE+ or USB2.0+, but it is 10/100Mbps (25Mb max. signalling rate etc.)
> so I'm less concerned.
>
>
>
> At 10Mbps it doesn't matter - at 100Mbps it does slightly. (Not sure where
> your "25Mb max. signalling rate" comes from - should be 31.25MHz? :-) )
>
Oops - I made that up. 25Mb at the Phy, 31.25MHz on the wires... Sorry.
>
> Plus it has been tested (apparently) downloading 3 episodes of Games of
> Thrones from iTunes (neither downloading from iTunes, nor downloading
> GoT are of any interest to me), although I don't know what the cable
> lengths used were etc.. So it does, apparently, work...
>
>
> Did they publish bit/packet error rates? TCP can hide a lot of errors.
> (Man I
> hate TCP - but that's a rant for another day...)
I tell my students that TCP has been with us for some decades now and
carries untold petabytes/sec across all the Internets. And, as far as
we know, the _protocol_ itself has never dropped a byte (some
implementations may have). It's ugly, but I wouldn't be reading your
messages with out it...
>
> Might be worth writing them a note to let them know that this might be
> a thing.
>
>
> Did so ;-)
I did too, and Paul mentioned that he already had your message...
Bob Edwards.
>
> David
>
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