On Sat, Jun 20, 2020 at 16:14 Bryan Fields <br...@bryanfields.net> wrote:
> On 6/20/20 1:56 PM, Saku Ytti wrote: > > On Sat, 20 Jun 2020 at 20:52, Wayne Bouchard <w...@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 >
