I doubt that rx level is the problem here. Dispersion becomes a bigger problem once you go past 10G speeds, on those long links.
On Wed, Jan 24, 2024, 12:27 p.m. Josh Luthman <j...@imaginenetworksllc.com> wrote: > Even if the RX level is good? > > > rx was within 0.3dBm on all 4 lanes on both sides > > On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF <af@af.afmug.com> > wrote: > >> Yeah makes me think the two paths have different loss. We have had that >> on mirrored paths, or even single paths with crappy splices on one of the >> strands. >> >> >> >> *From:* AF <af-boun...@af.afmug.com> *On Behalf Of * Chuck McCown via AF >> *Sent:* Wednesday, January 24, 2024 11:12 AM >> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> >> *Cc:* ch...@go-mtc.com >> *Subject:* Re: [AFMUG] optical TX power levels >> >> >> >> Did anyone do dispersion testing on the fiber? >> >> >> >> Chuck McCown >> McCown Technology Corporation >> 8401 N Commerce Dr >> Lake Point, Utah 84074 >> 801-250-9503 >> 435-830-4306 cell >> www.mccowntech.com >> www.microtrench-blades.com >> www.terabitnetworks.com >> >> >> >> *From:* Zach Underwood >> >> *Sent:* Wednesday, January 24, 2024 12:07 PM >> >> *To:* AnimalFarm Microwave Users Group >> >> *Subject:* Re: [AFMUG] optical TX power levels >> >> >> >> tired again this morning and still no link. rx was within 0.3dBm on all 4 >> lanes on both sides. We got 10gb 80km to link up. This will do for now. We >> will be looking at getting 40gb 80km single lane optics or adding another >> site to fiber loop to shorten the footage to under 40km. >> >> >> >> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners <cstann...@gmail.com> >> wrote: >> >> 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: >> >> 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: >> >> 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: >> >> Oh, meaning the variance between the two, otherwise identical models? >> >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions <http://www.ics-il.com/> >> <https://www.facebook.com/ICSIL> >> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> >> <https://www.linkedin.com/company/intelligent-computing-solutions> >> <https://twitter.com/ICSIL> >> Midwest Internet Exchange <http://www.midwest-ix.com/> >> <https://www.facebook.com/mdwestix> >> <https://www.linkedin.com/company/midwest-internet-exchange> >> <https://twitter.com/mdwestix> >> The Brothers WISP <http://www.thebrotherswisp.com/> >> <https://www.facebook.com/thebrotherswisp> >> >> >> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> >> ------------------------------ >> >> *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 <http://zachunderwood.me> >> >> 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 >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> >> >> >> >> -- >> >> Zach Underwood (RHCE,RHCSA,RHCT,UACA) >> >> My website <http://zachunderwood.me> >> >> 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 >> >> >> >> >> >> -- >> >> Zach Underwood (RHCE,RHCSA,RHCT,UACA) >> >> My website <http://zachunderwood.me> >> >> 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 >
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