Ok we got the report back from the fiber supplier. This is new to me so anyone can offer insight into it?
PDF https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF <af@af.afmug.com> wrote: > Dispersion compensation module - https://www.fs.com/products/65783.html > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Ken Hohhof > *Sent:* Wednesday, January 24, 2024 3:53 PM > *To:* 'AnimalFarm Microwave Users Group' <af@af.afmug.com> > *Subject:* Re: [AFMUG] optical TX power levels > > > > I spent a few minutes searching on the term DCM and came up with “chirped > fiber Bragg grating”. > > https://en.wikipedia.org/wiki/Fiber_Bragg_grating > > > > OK, I’m out of my depth now. > > > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Daniel Pautz via AF > *Sent:* Wednesday, January 24, 2024 4:40 PM > *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> > *Cc:* Daniel Pautz <d...@webnx.com> > *Subject:* Re: [AFMUG] optical TX power levels > > > > Perhaps pick up a used cheap DCM and see if it helps, adjustable > preferred if not as close to the fiber distance. Our newest 100G dwdm > build (dozen 100G optics) very much needed a DCM on it. > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Chuck McCown via AF > *Sent:* Wednesday, January 24, 2024 3:36 PM > *To:* 'AnimalFarm Microwave Users Group' <af@af.afmug.com> > *Cc:* ch...@go-mtc.com > *Subject:* Re: [AFMUG] optical TX power levels > > > > Gotta think of the Fourier series of the pulse. Yes group velocities or > group delay of the whole enchalada. It is all kinda the same thing. They > were doing some kind of soliton fiber development. Haven’t heard much for > some time about that. No idea how frequency pure/coherent the tx is. I > imagine phase coherency is a big deal. > > > > > > > > *From:* Ken Hohhof > > *Sent:* Wednesday, January 24, 2024 4:12 PM > > *To:* 'AnimalFarm Microwave Users Group' > > *Subject:* Re: [AFMUG] optical TX power levels > > > > Looks like different wavelengths have different group velocities, so > compensation is possible (but probably not cheap?). > > > > Is this because the transmitter doesn’t generate literally a single > wavelength? Or is this a WDM issue? Chuck says the pulses get smeared out > in time, that sounds like the first one. > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Chuck McCown via AF > *Sent:* Wednesday, January 24, 2024 3:56 PM > *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> > *Cc:* ch...@go-mtc.com > *Subject:* Re: [AFMUG] optical TX power levels > > > > Yeah, the pulses tend to get smeared out in time if there is too much > dispersion. Similar to trying to use too high level of QAM with SNR > issues. > > > > *From:* Josh Luthman > > *Sent:* Wednesday, January 24, 2024 12:26 PM > > *To:* AnimalFarm Microwave Users Group > > *Subject:* Re: [AFMUG] optical TX power levels > > > > 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/> > > Midwest Internet Exchange > > The Brothers WISP > > > > > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > ------------------------------ > <https://www.facebook.com/ICSIL> > > > > > > > > > *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 <https://www.facebook.com/ICSIL>* > > 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. <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > Has anyone seen much difference between optic like this? My sample size is > small due to the optices costing $4k each <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > -- <https://www.facebook.com/ICSIL> > > Zach Underwood (RHCE,RHCSA,RHCT,UACA) <https://www.facebook.com/ICSIL> > > *My website <https://www.facebook.com/ICSIL>* > > *advance-networking.com <https://www.facebook.com/ICSIL>* > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > > > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > -- <https://www.facebook.com/ICSIL> > > Zach Underwood (RHCE,RHCSA,RHCT,UACA) <https://www.facebook.com/ICSIL> > > My website <https://www.facebook.com/ICSIL> > > advance-networking.com <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > > -- <https://www.facebook.com/ICSIL> > > Zach Underwood (RHCE,RHCSA,RHCT,UACA) <https://www.facebook.com/ICSIL> > > My website <https://www.facebook.com/ICSIL> > > advance-networking.com <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > ------------------------------ > <https://www.facebook.com/ICSIL> > > > > > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > <https://www.facebook.com/ICSIL> > ------------------------------ > <https://www.facebook.com/ICSIL> > > > > > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <https://www.facebook.com/ICSIL> > > ------------------------------ > > -- > 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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