Elvith Ma'for

Former Reddfugee, found a new home on feddit.de. Server errors made me switch to discuss.tchncs.de. Now finally @ home on feddit.org.

Likes music, tech, programming, board games and video games. Oh… and coffee, lots of coffee!

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Joined 7 months ago
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Cake day: June 21st, 2024

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  • The earth’s diameter is about 12.700km. that’s 12.700.000m.

    Assuming it were a perfect sphere (it isn’t, but that shold give an estimate), the distance on the surface “to the other side of the world” would be 180°/360°*pi*12.700.000m=19.949.113m - also assuming not using satellite communications.

    Phone signals will either travel as electric fields in copper cables, as radio waves or as light waves in a fiber channel. All cases travel with speed of light c=299.792.458 m/s

    That means, that the time to send the signal to the other end of the world takes about 19.949.113m/299.792.458 m/s = 0,0667s. Now add a few electronic components on there to refresh the signal or transfer it from one medium to another (e.g. the radio tower receiving the RF signal and sending it via fibre out). All of these add a few milliseconds - that’s in the range of 0,001s to 0,01s.

    You usually start to notice that sound is delayed for movies when it’s more than 0,2s delayed - and that’s with the visual cues. While calling someone, you cannot see them which gives even more leeway. So you probably won’t really notice the delay in those calls.








  • I don’t know this specific brand but because of this quote in the article I assumed it’d not be automatically registered:

    “If you do choose to register a Peak Design product, and it is lost or stolen, you can reach out to our customer service team and have your registration erased, so the bag is not traceable back to you.”

    Why do they say “if you do choose to register” if you don’t have a choice?


  • I don’t think that ‘tracing’ here means something like ‘there’s a GPS tracker in every backpack’.

    You could see this type of backpack in a CCTV shot. Later the police recovered a backpack - that they thought was the one on CCTV - and now need to find the owner. If it was registered at the company by the owner, they may have been able to say “oh yes, that serial number is registered to a customer. Here’s their name and address they told us when registering at $date”. If the customer never registered their bag, the only piece of information they could give out would (maybe) be something like “This bag was sent to an Amazon warehouse at $date, ask them if they know who bought these bags around $date”