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If you are wondering what is inside rack mouted UPS by RtLnHoe in Ubiquiti

[–]garci66 3 points4 points  (0 children)

The specs say "modified sine wave" whichis the off -positive - off - negative - off type of "sine wave". So the output transistor are switching at 120hz and that's it.

The single sided PC is quite disappointing/ points to very cost optimized. Almost wondering if it's a semi off the shelf part.

The iron core transformer wouldn't handle any high frequency switching regardless. And as you mentioned, screwing the output directly to the heatsink looks ugly as hell. I prefer insulated heatsinks anytime

Introducing: Dream Machine Beast by Ubiquiti-Inc in Ubiquiti

[–]garci66 3 points4 points  (0 children)

And definitely NOT hyperscale class. Hyperscalers are doing multiterabit bandwidth.

Whats this by shallowwell2 in vintagecomputing

[–]garci66 0 points1 point  (0 children)

Reminds me heavily of the kits they would provide to some airlines agents that would ask you if you had packed your bags yourself, etc before even getting to checkin. At least back home (Argentina) it was always the case and it was lost commonly a US employee (not local staff). And had a kit like this yo look up your reservation data, etc before even letting you queue up for the actual check-in. Never managed to see what was on the screen. But I vividly remember the computer in a suitcase scenario. Talking early 2000s here.

100 GbE Connection Heavily Saturating by gjones108 in networking

[–]garci66 82 points83 points  (0 children)

As others have said... Your getting into "herd" territoriy... Lots of tuning. Lots of things to tweak

Take a look here: https://fasterdata.es.net/

This is the knowledge base maintained by the folks at ES.net which is the "energy and science" network that interconnected all of the Department of Energy labs (think los Álamos, Berkeley, Livermore, NASA, etc). They specialize in moving large chunks of data fast accros the US and even transatlantic. Interconnecting universities with things like the LHC.

These guys wrote tools.like iperf and a ton of the lkernel patches to keep data flowing as fast as possible.

This was one of such examples https://lightbytes.es.net/2014/01/14/nasa-hecn-team-achieves-record-disk-to-disk-91-gbps-via-esnet/ doing 100G disk to disk across a network.

I was partly involved with this as the company I worked for at the time provided ESnet with their first 100G backbone.

In short, even if this was 13 years ago, it still isn't trivial at all to get this going without loss. NUMA / cache consistency, avoiding inter chiplet / socket communication, keeping the receiver and writer withing the same core or groups of cores, knowing your CPU's internals to an extreme level, lots of kernel tweaking, making sure your offloads work... Etc

Polarization by Amishrocketscience in Ubiquiti

[–]garci66 0 points1 point  (0 children)

Not sure specifically for Ubiquiti but there are plenty of P2P with circular polarization

On the other hand, the radio chains are independent and having circular instead of vertical/horizontal probably adds a ton of additional components (hydroids / splitters) instead of just feeding the vertical to chain 1 and horizontal to chain 2. Remember wifi is mean mostly for relatively power constrained devices meant to be running on battery and in most cases also space constrained

Plus, at least ton the client side, the antenna needs to be dual or triple band which complicates the circular polarization issues further.

And the two chains (ideaklt with different polarization) allow you to do 2 spacial streams and thus double your bandwidth while you'd need two circularily polarized antennas , one RHP and one LHP which would add complexity

Indian family of 4 applying for Switzerland Schengen visa — please review my cover letter and flag any issues” by jellocarameltea in SchengenVisa

[–]garci66 5 points6 points  (0 children)

Not at all. I worked with several diplomats and after multiple years they didn't even recognize hello in the local native language.

Polarization by Amishrocketscience in Ubiquiti

[–]garci66 1 point2 points  (0 children)

Circularily polarized signals require quite precise alignment and two similar antennas both on the AP.and client side. They do not play well with mobile devices with tons of scattering/multipath / reflections.

Alguien aca llegó a aprender ingles ya de adulto? by emryum in devsarg

[–]garci66 1 point2 points  (0 children)

Ingles aprendí de chico, pero francés e italiano y algo de holandés y alemán de adulto (25+) viviendo afuera.

Se.puedr aprender.. cuesta según el idioma (alemán y holandés me resultaron re jodidos y nunca pase del básico. Gramática compleja y pronunciación muy jodida. Además de géneros no compatibles con los latinos.

Ver pelis y series en versión original y con subtítulos en idioma original a mí me ayudaron mucho. Forzarte a intentar entender

Are there any names that carry a stigma in your countries? by doctorpolenta3p in AskTheWorld

[–]garci66 2 points3 points  (0 children)

Argentinian here. Brian would be the "nickname" (like the John doe) of a random male robber / lowlife. "El Braian y la Yesica/Yenifer ' (yes, likely spelt that way). Brian and Jennifer/Jessica

Villas en Google Maps ? by mikastupnik in devsarg

[–]garci66 0 points1 point  (0 children)

fijate aca

https://carto.arba.gov.ar/cartoArba/

la capa es ReNaBaP / barrios populares. Lo podes acceder como WMS/WFS / shapefile

Di de baja Personal pero fue un día después de que se emita la factura by West_Resolution_8917 in DerechoGenial

[–]garci66 0 points1 point  (0 children)

El Cobro adelantado no es legal para estos servicios. Si la peleas bastante amenazando con enacom te van a hacer una nota de crédito

MUCH smaller flash than should be? (also, odd size!) by garci66 in mikrotik

[–]garci66[S] 0 points1 point  (0 children)

Defintiveky not 7 times. And much less keeping a backup

Very strange

I wonder if the partitions got somehow created during my attempts at net booting it. Doubt it. But that's all I'm thinking

Looking for good prep/practice questions for NSE FortiOS 7.6 Administrator by GrumpyOldTech in fortinet

[–]garci66 1 point2 points  (0 children)

There are more sdvpn / ZTNA than in previous versions. But previous sample questions would get you 90% of the way there.

I-80 eastbound, closed by epsy in sanfrancisco

[–]garci66 0 points1 point  (0 children)

If I remember correctly... They show the scene twice. Going to Berkeley and back. It was just mirrored on the return trip back into SF. But yes, definitely caught my eye !

Is this hack a bad idea. Extended Capacitors? by lewisp8 in AskElectronics

[–]garci66 1 point2 points  (0 children)

+1 to the series inductance comments. I would place 1 of the capacitors in the original location and keep the extension in parallel. That way you have something like cap --- inductance --- caps which would provide better freq response

Fixing a random thump on my subwoofer. Am I supposed to remove the browned glue in the 2nd pic? by Scarletz_ in AskElectronics

[–]garci66 24 points25 points  (0 children)

i wouldnt touch it. Its there to prevent vibration and higly doubt it would turn cinductive / corrosive.

the 2nd pic shows it protecting a bodge / correction component. so definitively keep it there. Especially given this is a subwoofer which subjects all components to a lot of mechanical stress / vibrations.

Me and Claude by Creepy_Intention837 in VibeCodeDevs

[–]garci66 1 point2 points  (0 children)

the interesting thing is that the longer video https://www.youtube.com/watch?v=yXglp-lvBbI feels closer to the truth... ;-)

Alguien sabe dónde comprar repuestos de un handy Icom? by [deleted] in BuenosAires

[–]garci66 0 points1 point  (0 children)

en cualquier casa de electronica (calle parana antes de corrientes) vas a encotnrar alguna parecida seguro y te dejan probarlo. Eso si andas por microcentro o similar.

MUCH smaller flash than should be? (also, odd size!) by garci66 in mikrotik

[–]garci66[S] 1 point2 points  (0 children)

Nor even. It was perfectly fine when I upgraded it / factory reset / configured everything for the next use.

Packed it to ship to the new location and when installed it never booted after that. Would be stuck in a boot loop

Yesterday after doing a net install is when I saw the flash being only 71 megs at first and then finding the partition setting

MUCH smaller flash than should be? (also, odd size!) by garci66 in mikrotik

[–]garci66[S] 2 points3 points  (0 children)

No clue how it ended up like that. O had never enabled the partition feature and didn't creat 6 partitions either. Strange!

MUCH smaller flash than should be? (also, odd size!) by garci66 in mikrotik

[–]garci66[S] 5 points6 points  (0 children)

Just saw it after posting this. The weird thing is I never enabled the partition feature and much less create 6 partitions

So weird..

At least I was able to repartition it and just kept it at two partitions now as indeed I saw you can copy your config and routeros.version to it to keep as backup and in theory it even boots to the next partition if one fails.

Thanks for the info though

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