[time-nuts] Possibly off topic - Jitter on Ethernet over poweradapters

Christopher Brown cbrown at woods.net
Mon Feb 11 09:42:02 UTC 2013


Ahem!

Ethernet over powerline!

NOT PoE!


The various forms of ether over power are (for practical purposes) a
wireless ethernet protocol coupled into the AC wiring.


And yes, it is noisy timing wise, for all the same reason that a
simplex/shared variable rate 802.11 system is.



On 2/10/13 9:15 PM, David J Taylor wrote:
> It is unlikely to add much noise.  The PoE device only puts a DC bias
> on the twisted pair.  The data signal is differential.   It is
> transformer couple to is pretty much is immune to common mode noise.
> So even iif the DC bias was noisy I don't thing it would matter.
> 
> Chris Albertson
> Redondo Beach, California
> ====================================
> 
> Chris,
> 
> This isn't PoE we're discussing.  It's data over "mains wiring".   110 V AC 
> to you, 240 V AC to me.  Homeplug.
> 
>   http://www.dabs.com/products/zyxel-pla4201-500mbps-mini-powerline-ethernet-adaptor-twin-pack-83VC.html?q=ethernet%20power%20line&src=16
> 
> Cheers,
> David
> 



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