What are some low-cost switches that support the 400G OpenZR optics?
Can you get 400G OpenZR optics in a passive mux-friendly channel plan?
-----
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/>
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*From: *"Trey Scarborough" <[email protected]>
*To: *[email protected]
*Sent: *Thursday, January 25, 2024 5:00:58 PM
*Subject: *Re: [AFMUG] optical TX power levels
Ive done a lot of these 100G 80k links and its not likely dispersion
causing your problem. Its more likely the opposite. If you have
segments of NZ fiber "Non-zero dispersion-shifted fiber" you can have
issues. After looking at your OTDR it looks to be a mix of different
fiber types thats how you get the negative loss splices. If it is a
mix of NZ and smf28 fiber your probably not going to be able to get it
to work. The NZ fiber causes issues with the 1200-1300 signals on
those optics. I have had spans of 50k that 80k optics would not work
on due to this. I would have them run an OTDR at 1310 and see what it
shows you are likely to get a very different looking result. If that's
the case there aren't too many good options. Your best is if your
switch has 400g ports get some OpenZR 400G optics and use them.
Surprisingly that aren't incredibly more expensive than the 100G 80ks.
I would have the fiber provider give you a 1310 OTDR and also request
fiber type information for the span. We build these things all the
time so if you need some help feel free to email me and I can see
about finding a solution that will work for you.
On 1/24/24 6:40 PM, Zach Underwood wrote:
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
<[email protected] <mailto:[email protected]>> wrote:
Dispersion compensation module -
https://www.fs.com/products/65783.html
*From:*AF <[email protected]
<mailto:[email protected]>> *On Behalf Of *Ken Hohhof
*Sent:* Wednesday, January 24, 2024 3:53 PM
*To:* 'AnimalFarm Microwave Users Group' <[email protected]
<mailto:[email protected]>>
*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 <[email protected]
<mailto:[email protected]>> *On Behalf Of *Daniel Pautz
via AF
*Sent:* Wednesday, January 24, 2024 4:40 PM
*To:* AnimalFarm Microwave Users Group <[email protected]
<mailto:[email protected]>>
*Cc:* Daniel Pautz <[email protected] <mailto:[email protected]>>
*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 <[email protected]
<mailto:[email protected]>> *On Behalf Of *Chuck McCown
via AF
*Sent:* Wednesday, January 24, 2024 3:36 PM
*To:* 'AnimalFarm Microwave Users Group' <[email protected]
<mailto:[email protected]>>
*Cc:* [email protected] <mailto:[email protected]>
*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 <[email protected]
<mailto:[email protected]>> *On Behalf Of *Chuck McCown
via AF
*Sent:* Wednesday, January 24, 2024 3:56 PM
*To:* AnimalFarm Microwave Users Group <[email protected]
<mailto:[email protected]>>
*Cc:* [email protected] <mailto:[email protected]>
*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
<[email protected] <mailto:[email protected]>> 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 <[email protected]
<mailto:[email protected]>> *On Behalf Of *Chuck
McCown via AF
*Sent:* Wednesday, January 24, 2024 11:12 AM
*To:* AnimalFarm Microwave Users Group <[email protected]
<mailto:[email protected]>>
*Cc:* [email protected] <mailto:[email protected]>
*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 <http://www.mccowntech.com>
www.microtrench-blades.com <http://www.microtrench-blades.com>
www.terabitnetworks.com <http://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
<[email protected] <mailto:[email protected]>> 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
<[email protected] <mailto:[email protected]>>
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
<[email protected] <mailto:[email protected]>>
wrote:
There should be. What does their datasheey
indicate for tx power range?
On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood
<[email protected]
<mailto:[email protected]>> wrote:
Yep labels identical but there is a
difference in default power levels.
On Wed, Jan 24, 2024, 8:13 AM Mike Hammett
<[email protected]
<mailto:[email protected]>> 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>
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*From: "Zach Underwood"
<[email protected]>
To: "AnimalFarm Microwave Users Group"
<[email protected]>
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
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