nanog mailing list archives
Re: 60 ms cross-continent
From: Saku Ytti <saku () ytti fi>
Date: Sun, 21 Jun 2020 09:08:06 +0300
On Sat, 20 Jun 2020 at 23:14, Bryan Fields <Bryan () bryanfields net> wrote:
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.
FEC is low tens of meters (i.e. low tens of nanoseconds), QAM is less. Won't impact the pipeline or NPU scenarios meaningfully, will impact the low latency scenario. -- ++ytti
Current thread:
- Re: 60 ms cross-continent, (continued)
- Re: 60 ms cross-continent Joe Greco (Jun 20)
- Re: 60 ms cross-continent Tim Požár (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Dave Cohen (Jun 20)
- Re: 60 ms cross-continent Mel Beckman (Jun 20)
- Re: 60 ms cross-continent Wayne Bouchard (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Bryan Fields (Jun 20)
- Re: 60 ms cross-continent Martin Hannigan (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Tim Požár (Jun 20)
- Re: 60 ms cross-continent Joe Greco (Jun 20)
- Re: 60 ms cross-continent Tony Finch (Jun 21)
- Re: 60 ms cross-continent Alejandro Acosta (Jun 20)
- Re: 60 ms cross-continent Joe Hamelin (Jun 22)
- Re: 60 ms cross-continent Rod Beck (Jun 22)
- Re: 60 ms cross-continent Carsten Bormann (Jun 20)
- Re: 60 ms cross-continent Marshall Eubanks (Jun 20)
- Re: 60 ms cross-continent Rubens Kuhl (Jun 21)