On 6/20/20 1:56 PM, Saku Ytti wrote: > On Sat, 20 Jun 2020 at 20:52, Wayne Bouchard <[email protected]> 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
