The cell network routinely does TDoA triangulation in order to help choose which tower should serve the client mobile device. Accuracy is about 20m, and may be better at 5G frequencies. 911 gets the location from the mobile network provider, but the network provider could provide it to anyone, and they do.
Tons of "free" and crapware apps are also recording location, and sending it to data brokers.
Using LTE Timing Advance feature, especially on 5G, accuracy can be much higher.
https://5g-tools.com/5g-nr-timing-advance-ta-distance-calcul... shows an example of the parameters necessary. I don't think you can get your smartphone to dump those stats for you, but the granularity of the individual distance measurement is in the tens of centimeters.
Of course this strongly depends on cell infrastructure being placed precisely, continuously updating correction factors, and a bunch of antennae being around the target to get measurements for, but in most cities that isn't much of a challenge if the operator is working together with whoever wants to spy on citizens.
I purchased a copy of OSF Motif for Linux (x86) sometime in the early 1990's (before it was free). I had used it before on SunOS and I liked it.
One of the most annoying things about it was that it did not address the endianness of the arguments to the library functions. So it worked fine on big endian platforms, but not so fine on little endian ones (such as Intel).
It would still work okay if you byte swapped the arguments in and out of the library functions, but it just seemed silly to need to do that, and it made it more difficult to write portable code.
Years ago, I used to get marketing spam emails from Bank of America. In their email, they did not offer a way to opt out from those types of email, so I invalidated the unique email address that I had created just for them. A few months later, I got a snail mail letter like the one Dan got, telling me that emails were being rejected and that I needed to correct my email address. I went through the same sort of nonsensical dialog with them, and they simply would not let me opt out from their marketing emails, so I left it disabled for a few years. Eventually they offered "email preferences", so I re-enabled it.
My wife continues to get spam snail mail from Citi, and they offer no way to opt out. If it was my account, I would switch banks.
Back to the main topic: I think it's pretty stupid of the HSBC IT folks to assume that an email was not read because the tracking pixels were never accessed. Lots of email clients these days do not load images by default.
The criticality of the alerts should be classified, and presented with the alert. Users should have the ability to filter non-critical messages on certain platforms.
Unfortunately, some systems either don't track criticality, or some of the alerts are tagged with the wrong level.
(One example of the latter is the Ruckus WAP, which has a warning message tagged at the highest level of criticality, so about two or three times a month, I see the critical alert: "wmi_unified_mgmt_rx_event_handler-1864 : MGMT frame, ia_action 0x0 ia_catageory 0x3 status 0x0", which should be just an informational level alert, with nothing to be done about it. I've reported this bug to Ruckus a few times over the past five years, but they don't seem to care.)
1000Base-T uses four pairs in both directions at the same time. It does this through the use of a hybrid in the PHY that subtracts what is being transmitted from what is received on the wires. 802.3ab is a fairly complicated specification with many layers of abstraction. I spent a few months studying it for a project about a decade ago.
My latest house, built about eight years ago, came with CAT6A cabling for all of the phones. That made it really easy to just replace all of the RJ11 jacks with RJ45 (or 8P8C if you like to call them that). They've been providing POE+ gigabit Ethernet for the past seven years, and I'm about to upgrade them to 10GBase-T.
I envy you. Must be nice to open up a wall jack and be pleasantly surprised instead of bitterly disappointed :-).
I recently built a vacation property and could choose what to install. Initially, I was thinking CAT6A but after getting some good quality plenum-rated 6A to play with, I discovered it's surprisingly thick and doesn't bend very easily (minimum corner radii to avoid shield damage are actually specced) and it's not exactly easy to DIY new connectors on them correctly if you don't do it all the time.
So, after really considering the max throughput I'm ever likely to actually use, I decided to go with some good CAT6. It wasn't even a cost thing, as the difference was negligible. It was just practical reality. None of the runs are very long and I should be able to get up to 10gbps on 6A, although I doubt I'll ever use more than 2.5gbps (only using 1gbps today). One factor is the property is off-grid except for AC, so data is via StarLink anyway and fiber won't ever happen out there. While LEO satellite and terrestrial cellular speeds will increase in coming years, when more than 2.5gpbs is available - it'll almost certainly be priced to maximize B2B profit and we probably wouldn't pay that for a vacation house (because this is the US, not someplace that prices broadband rationally like Korea).
I hope that we will eventually find out why it was shut down.
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