60 ms cross-continent

Sat Jun 20 20:36:47 UTC 2020

On Sat, Jun 20, 2020 at 16:14 Bryan Fields <Bryan at bryanfields.net> wrote:

> On 6/20/20 1:56 PM, Saku Ytti wrote:
> > On Sat, 20 Jun 2020 at 20:52, Wayne Bouchard <web at typo.org> wrote:
> >
> >> And thus far, no one has mentioned switching speed and other
> >> electronic overhead such as the transceivers (that's the big one,
> >> IIRC.)
> > This will be something from tens of meters (low lat swich), to few
> > hundred meters (typical pipeline),  to 2km delay (NPU+FAB+NPU) per
> > active IP device. If that is a big one, I guess it depends, cross
> > atlantic, no, inside rack, maybe.
>
> I think he might be referring to the newer modulation types (QAM) on long
> haul
> transport.  There's quite a bit of time in uS that the encoding takes into
> QAM
> and adding FEC.  You typically won't see this at the plug-able level
> between
> switches and stuff.
>
> 60ms is nothing really, and I'm happy I don't need to play in the HFT space
> anymore.  I do wish my home connection wasn't 60 ms across town as spectrum
> wants takes TPA-ATL-DCA-DEN-NY to get to my rack. :-)

working on that ...... :-)

> --
> Bryan Fields
>
> 727-409-1194 - Voice
> http://bryanfields.net
>
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