Re: [AFMUG] optical TX power levels

Consider my socks blown off.Do you need 2 of them, one for each strand? Does it go at the xmt end, or the rcv end, or doesn't matter? I'm assuming you don't need 4 total. Original Message From: "Daniel Pautz via AF" Sent: 1/24/2024 5:00:29 PMTo: "AnimalFarm Microwave Users Group" Cc:

Re: [AFMUG] optical TX power levels

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 wrote: > Dispersion compensation module -

Re: [AFMUG] optical TX power levels

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" To: "AnimalFarm Microwave Users Group" Sent: Wednesday, January

Re: [AFMUG] optical TX power levels

I wonder if it would work as 4x 25gig links. Should be able to configure it that way. Get Outlook for iOS From: AF on behalf of Chuck McCown via AF Sent: Wednesday, January 24, 2024 5:36:06 PM To: 'AnimalFarm Microwave Users Group' Cc:

Re: [AFMUG] optical TX power levels

Dispersion compensation module - https://www.fs.com/products/65783.html From: AF On Behalf Of Ken Hohhof Sent: Wednesday, January 24, 2024 3:53 PM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] optical TX power levels I spent a few minutes searching on the term DCM and came up

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 On Behalf Of Daniel Pautz via AF Sent: Wednesday, January 24, 2024 4:40 PM To: AnimalFarm Microwave

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 On Behalf Of Chuck McCown via AF Sent: Wednesday, January 24, 2024 3:36 PM To: 'AnimalFarm

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

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

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

Re: [AFMUG] optical TX power levels

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 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

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 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

Re: [AFMUG] optical TX power levels

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 On Behalf Of Chuck McCown via AF Sent: Wednesday, January 24, 2024 11:12 AM To: AnimalFarm Microwave Users Group Cc:

Re: [AFMUG] optical TX power levels

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 wrote: > Did anyone do dispersion testing on the fiber? > > Chuck McCown > McCown Technology Corporation > 8401 N Commerce Dr > Lake Point, Utah 84074 >

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

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,

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

Re: [AFMUG] optical TX power levels

Do you need dispersion compensation for 100GBASE-ZR4? On Wed, Jan 24, 2024 at 8:03 AM Mike Hammett wrote: > Well, and it would depend on which type of 100G. Some is 10x10, some is > 25x4, and some is 100x1. > > > > - > Mike Hammett > Intelligent Computing Solutions

Re: [AFMUG] optical TX power levels

Well, and it would depend on which type of 100G. Some is 10x10, some is 25x4, and some is 100x1. - Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP - Original Message - From: dmmoff...@gmail.com To: "AnimalFarm Microwave Users

Re: [AFMUG] optical TX power levels

100 gig is going to have I believe 4 wavelengths. This command shows you the level on each channel: show interfaces et31/1 transceiver dom I think if one channel isn’t connected you wouldn’t get 100G link, but you’d still have receive power. Bends and such can impact one channel and

Re: [AFMUG] optical TX power levels

They auto adjust the Tx. I haven’t dug deep into how that works, but I would assume it’s keyed off the Rx signals. However they do it, it’s not unusual for them to land at different levels This is from a pair of 20km transceivers between two Aristas. They’re not FS.com. The brand is

Re: [AFMUG] optical TX power levels

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

Re: [AFMUG] optical TX power levels

There should be. What does their datasheey indicate for tx power range? On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood wrote: > Yep labels identical but there is a difference in default power levels. > > On Wed, Jan 24, 2024, 8:13 AM Mike Hammett wrote: > >> Oh, meaning the variance between

Re: [AFMUG] optical TX power levels

Yep labels identical but there is a difference in default power levels. On Wed, Jan 24, 2024, 8:13 AM Mike Hammett wrote: > Oh, meaning the variance between the two, otherwise identical models? > > > > - > Mike Hammett > Intelligent Computing Solutions >

Re: [AFMUG] optical TX power levels

Many SFPs say up to 5dB variance in their specs, but luckily I've only experienced up to 2-3dB. 1.2dB variance is small. On Wed, Jan 24, 2024, 7:13 a.m. Mike Hammett wrote: > Oh, meaning the variance between the two, otherwise identical models? > > > > - > Mike Hammett > Intelligent

Re: [AFMUG] optical TX power levels

Oh, meaning the variance between the two, otherwise identical models? - Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP - Original Message - From: "Zach Underwood" To: "AnimalFarm Microwave Users Group" Sent: Tuesday,