I am not familiar dispersion testing but we ask the outside plant provider about that.
On Wed, Jan 24, 2024 at 1:13 PM Chuck McCown via AF <af@af.afmug.com> wrote: > 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 > -- Zach Underwood (RHCE,RHCSA,RHCT,UACA) My website <http://zachunderwood.me> advance-networking.com
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