[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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