To make a compliant ethernet signal from this you would need at least some sort of line driver/receiver as well.

Just put normal test pads next to the tag connect, a bit more spaced out. A bed of nails in the production line connects to that, the tag connect can be used for bench development.

This is the way

We tried this long ago at a university, the cards we had were entirely invisible to the x-ray.

I think the 'x-ray' table in the article works with IR cameras and illuminators under the table, and tablecloth that is slightly IR transparent.

Laser decapping will destroy the die, except if you have a rare package that does not mix glass in the epoxy.

You could still compare the internal structure of the package and bonding, but the die itself is mostly destroyed.

A lot of low population density cellular backhaul runs over satellite. Two factor SMS or voice can be directly intercepted, assuming encryption is not used.

A solar panel is like a normal silicon diode. The voltage over the cell goes up drastically with lower temperatures. In cold climates crowbars are usually added.

This architecture is good for data path applications, but not really for control flow (eg, think how expensive a context switch would be)

Yea, at best this is useful for deep embedded applications where you need a tiny bit of programmability and where implementation size in gates and cost is at a premium. It’s something you can stuff into a programmable logic device of some sort that you already have in the design. Otherwise, it’s interesting from an academic perspective in terms of studying minimalist computing architectures, but otherwise not practical.

Usually yes, but it is not an EU-wide system. Contact your spectrum regulator and ask for what options are available for private 5G[1]. You can likely get a bit of spectrum in the 1.8GHz guard band, around 2.3GHz, or somewhere between 3.4-5GHz. Price is from free to thousands of euros, depending on the country, transmit power and whether you are using outdoor cells. A private mmWave cell will almost everywhere need to be under an experimental/R&D license (we don't have public mmWave networks).

If you can choose, it's best to take a TDD license, as the duplexer required for FDD base station operation is a relatively expensive device when operating on an uncommon band.

1) Private 4G wasn't really a big thing in EU, but in most countries the license you get is technology neutral and can be used with a 4G base station as well.

PS: Connecting the private LTE to the public telephone network with a publicly reachable number requires a public telecom operator permit in some countries. You will also need to pay for the block of phone numbers. Roaming to the public cellular network requires many extra things which are not cheap or easy to obtain. And of course you need to have a roaming agreement with the other operator.

In the Netherlands you can run private 4G in the 1.8GHz GSM guard band. For indoor use with 200mW or less no license is required.

What kind of (cheap) hardware can be used for that?

These FreedomFi units seem to only support CBRS frequencies.

No, unless the Android is already rooted, it is not possible to send vendor HCI commands.

Thanks!