On 6/20/20 1:56 PM, Saku Ytti wrote:
On Sat, 20 Jun 2020 at 20:52, Wayne Bouchard <web@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. :-) -- Bryan Fields 727-409-1194 - Voice http://bryanfields.net