CAT-5 or 6 will be fine as miners actually use very little bandwidth and are happy even with a 10mbit connection. It is not until you start connecting to several miners that connection speed between the router & miners becomes a concern.

Not a chance. For all intents and purposes ALL are scams. Been that way for years.
 The 1 or 2 that are not outright scams have the habit of canceling your contracts whenever they please...

AFAIK Block bought everything associated with Intel's chip https://www.coindesk.com/tech/2023/04/28/jack-dorseys-block-snaps-up-bitcoin-mining-chip-as-intel-winds-down-production/ and I mean everything - IP included.

Oh I certainly agree. My point is that because it is not a major issue to them, BM just does not care. A 75kva autotransformer is only $1,1700 so smaller farms do have a viable solution to it. If companies like RIOT and Marathon who run sites that pull 10's to 100's of MW don't care then BM won't care either.

Getting way OT here but price for that isolation xmfr is too high. https://store.maddoxtransformer.com/products/64d50fed-3483-587e-9848-1f3005736804 has way better but again - applies only to 'small' farms that must use incoming 480vac from their existing utility supplied distribution transformer. Actually - that site has several excellent articles dealing with power distribution https://maddoxtransformer.com/resources/articles/

The mega farms pulling 10's to 100's of MW per-site have their own substations tied to The Grid's main transmission lines and can go a whole different route. Typically it is incoming xmfrs taking in 33kvac or higher from the utility and dropping that to a distribution voltage of 13kv or so which is sent to the mining warehouses to then be dropped to whatever voltage the miners need - in this case 400V - by several final transformers located at each warehouse or pod.

When starting from scratch with a blank slate makes it very easy to accommodate different needs just by having different final xmfrs to provide 240 or 400 or 480v and segregating the loads accordingly.

If their major markets were in Europe or Asia then building gear to use 400v would make sense but since that is not the case, I go with 'stupid'.

Since W=V*A, using a higher line voltage of course means that for any given power less amps are pulled which means that one can use components that are rated for lower current and are easier to cool since is the current that drives how much heat they waste. Fun fact, when designing power systems the component current rating has a much larger impact on price than the component voltage rating does.

My guess is that BM just does not care because multi-MW transformers are *not* what one would call a 'standard in-stock item'. They are made-to-order and that being the case the mega farms just spec theirs for 400v.

In the US industrial power is 460-480v. For new installations it's not hard to get transformers that deliver 380-415v but ja those are strictly for dedicated uses and even if you buy the service transformer the power companies will really push for a different solution unless you need more than say 1MW service. For existing services we would just use auto-transformers to knock 460/480v down to the desired range, they are fairly small and relatively low cost.

^^ Ja. It is very possible that you are using a USB charging cable - most that are labeled as 'charging' do not have the 2 data wires in them. When buying cables always look for the words 'data' and/or 'sync' in the description as that will mean that it has all 4 wires in it.

1st, kudos for removing the link.
No one said you are a scam.
They only pointed out that if you would have taken just a few minutes searching for what current top-of-the-line BTC miner speeds & power ratings are you would see that performance of the equipment that scam site says they are selling is pure B.S. Think of their comments as a lesson in learning to always dig deeper on your own before asking in a public Forum  

Do a search using asic miner speed as the search term to see what I mean... The top results are current best available.

That all said, yeah that particular scam (dual coins at the same time with incredible speed/power 'specs') comes up at least 2-3x a year and is probably ran by the same people...

One does have to ask where you came across that site? I do hope it wasn't from Coindesk or similar BTC 'news' site which are mostly pay-to-publish sites. Several years ago Coindesk ran a 'new product announcement' and 'reviews' on said miners for company running the exact same scam and got raked over the coals for it. Hopefully they have learned to at least use a *little* due-diligence on that sort of 'news'...

By getting it from Kano's GIT, https://github.com/kanoi/cgminer then reading the extensive README and pointing it at a supported ASIC-based miner...

Perhaps as step-1, but beyond proving you can combine workers it is still not a very worthwhile thing to do because of the very low diff. If you want to prove that new pool software operates correctly you need it to handle very high diff work

Why on Gods little Green Earth would you want to? Testnet has diff so low that it can be easily mined using a CPU or GPU.
The idea of a pool it to gather enough hash rate that one can mine HIGH diff coins....
Considering TBTC is literally worthless what would be the point?

Kudos for asking i the right area this time. As I replied to same query in the (wrong area):
 Learn what a search engine is and how to use one. Search term:   how to mine testnet btc
You will instantly have tons of answers...

A. Totally off-topic and belongs in a General section...
B. Learn what a search engine is and how to use one. Search term:   how to mine testnet btc
You will instantly have tons of answers...

Do a search using   LKETC Dragon software firmware  as the search term.
At the top are a lot posts from here in the Forum about it.
One thread is https://bitcointalk.org/index.php?topic=1307157.20

And as Kano replied - that is NOT his code.
There are many hacked/obsolete versions of it out there with who knows what changes made to it. The code you are using is one of them.

Use his code. As the sole remaining active primary developer of it you are assured of it being clean and the most current version. Link to it is in his sig.

Whoo - thass going way back to early 2014. It uses the A1 chips that the now defunct Bitmine.ch and Innosilicon collaborated on. Bitmine.ch provided most of the money with Inno getting the option of selling the chips to other mfgrs a few months after Bitmine released their Coincraft A1 miner. Go back to my earliest posts to catch that saga regarding their Made In America version that a company called AMT was supposed to handle...

Long story short - Bitmine.ch (and AMT) were clueless idiots when it comes to even the basics of dealing with high power chips and feeding them power. Their hash boards were utter crap. Massive failure there whereas companies like LKETC got it right. Innosilicon back then was an ASIC design house who designed the A1 chip and had them made by TSMC but at that time Inno did not make actual miners. As for the firmware - no idea about that but it has to exist *somewhere* on the `net. Back then the 'control board' was just a SPI data bus fed from the GPIO pins on the Pi. The entire code for the miner is on that SD card.

The Original Dragonmint thread from 2017 is here I'd think that ck's links should be somewhere in there...
Another is here

Close. Halong worked with Inno who actually built the miners. Halong had buckets of money and wanted to be 1st to use non-covert ASICBoost, Inno had the design/build expertise to make them and was licensed by Halong to market their own after x number of months assuming the idea (AB) caught on.

As for firmware, -ck was paid by Halong to do all of the cgminer code mods and driver work. Initially he was releasing FW updates every couple of days for Live User testing until he got the bugs worked out, odds are somewhere in his git the code is all there.

..... 6 lines down from here....https://bitcointalk.org/index.php?topic=5355470.0