Isn't 100G tolerant of dispersion, or is not all 100G coherent?
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Colin Stanners" <cstann...@gmail.com> To: "AnimalFarm Microwave Users Group" <af@af.afmug.com> Sent: Wednesday, January 24, 2024 10:13:25 AM Subject: Re: [AFMUG] optical TX power levels So both of those SFPs are within the tx power range. 100G may not work on a link that long unless you have dispersion compensation fiber on the path or in a huge loop in a box style at one end. You likely cannot change tx power levels on those SFPs, they will run at the max they can do for that specific unit. On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood < zunder1...@gmail.com > wrote: TX Power 2~6.5dBm I am struggling to get this 100gb link up. In the field this link is quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't get it to link. I take the same optics to the lab and add 20dbm of attenuator to get almost the same rx levels as the field and it will link up. I have added error-correction encoding reed-solomon per the user guide for links over 40km. So far I have not found a way to change the TX levels in arista, the options are in the CLI but they dont seem to change the outcome. For me this is the first time dealing with 80km optics or 100gb optics over 10km. switch is Arista DCS-7060SX2-48YC6-R https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf https://www.fs.com/products/115818.html?attribute=29032&id=3462585 On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners < cstann...@gmail.com > wrote: <blockquote> There should be. What does their datasheey indicate for tx power range? On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood < zunder1...@gmail.com > wrote: <blockquote> Yep labels identical but there is a difference in default power levels. On Wed, Jan 24, 2024, 8:13 AM Mike Hammett < af...@ics-il.net > wrote: <blockquote> Oh, meaning the variance between the two, otherwise identical models? ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP From: "Zach Underwood" < zunder1...@gmail.com > To: "AnimalFarm Microwave Users Group" < af@af.afmug.com > Sent: Tuesday, January 23, 2024 12:51:39 PM Subject: [AFMUG] optical TX power levels I got 2x 100gb 80km optics from FS that run difficult default TX power levels one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting the optics is the same. Has anyone seen much difference between optic like this? My sample size is small due to the optices costing $4k each -- Zach Underwood (RHCE,RHCSA,RHCT, UACA ) My website advance-networking.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- Zach Underwood (RHCE,RHCSA,RHCT, UACA ) My website advance-networking.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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