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

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Cake day: June 21st, 2024

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  • Basically it means to not have a special designed hardware for task X but to do much of it in software which gives you more flexibility. And also let’s you configure and use X a bit more flexible.

    E.g. software defined networking: If you run several virtual machines on a server, you may define the whole network between them virtually in software instead of doing it on the hardware side. Sure, you still need an ethernet card in your server to connect it to other servers and the internet, but all load balancing, switches, firewalls, VLANs, etc. between the virtual machines (or containers) on your server are virtualized in software - or maybe eben between servers.

    Same goes for e.g. Software Defined Radio. In the early days you had dedicated hardware to control the mobile network and the antennas and such. Today you “just” have the antenna and a transceiver that is capable of producing and receiving a wide range of signals and modulations. All encoding, decoding and interpretation the signals is done in software. If your hardware is capable enough, the upgrade from e.g. 4G to 5G may only be a software update for all base stations.











  • Well, VDSL and VDSL2 use 138kHz to 12MHz and then 30-35.5MHz (according to the german Wikipedia - I couldn’t find that table in the English article.)

    Powerline has several standards (same as above, couldn’t find that table in the English Wikipedia), but the frequency range starts at 2-4MHz and ends at 20-30MHz (with one standard using 30-68MHz).

    For DSL, there’s not really a problem using these frequencies but powerline transmits at a higher power and intentionally uses cross talk as a feature. The byproduct is that now your power cables act as an antenna and the Powerline signal “leaks”.

    Medium Frequency radio stations e.g. use the band from about 520kHz to 1.6MHz which correlates with Powerline and can be affected by it. Edit: Medium Frequency transmissions in general (300kHz - 3MHz) and High Frequency transmissions (3MHz - 30MHz) can be affected, but radio stations shouldn’t (~530kHz - 1.6MHz).

    And yes, if you’re transmitting “strong enough” over Powerline (depending on your adapter and how well your cables act as an antenna) one could recieve your signal and decode it. IIRC the signal is encrypted (somewhat like WiFi - the adapters need to be paired to talk to each other), but I don’t know much details about it.




  • …its just a password to access a list of passwords.

    Unless you never thought of, implemented, regularly did and regularly tested your backup of the database. Or… try to use it on more than one device - maybe even at the same time.

    That’s the main problem with KeePass. It’s nice to have it offline, fully under your control and out of the cloud, but that comes with some responsibilities on your end. And now think of how the average user solves this. If you’re tech savvy enough, KeePass is great!