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Oracle (eviltoast.org)
submitted 1 year ago by to c/justpost@lemmy.world
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[โ€“] 2 points 1 year ago (2 children)

GSM and CDMA don't really work that much differently. Neither has a constant-on radio, they register with a tower and then periodically check for a tower.

The main difference is one uses TDMA (GSM) and the other users CDMA for voice calls. (Time Division Multiplexing vs Carrier Division Multiplexing).

Text messaging is a side-effect of CDMA packet framing - it had to be tacked-on to GSM since it didn't utilize the same connection design.

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  • [โ€“] 1 point 1 year ago (1 child)

    Yeah I shouldn't have said constant I had that thought wrong. I guess it is better worded as continuosly syncratic rather than time based. I guess I was thinking the regular check-in would have caused the magnetic interference every time instead of just when the connection was amplified.

    I thought TDMA would have died with 2g though. We have so many devices now I would think it would be impossible to have time slots for check ins. Sounds like something fun to look into but unfortunately I doubt I'll ever have time to play with that.

    Always something new

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  • [โ€“] 1 point 1 year ago

    I don't think it uses time slots for check-in, just for the voice call part. Especially since a phone changing towers wouldn't know what time slot was available.

    I assume the interference is caused by a phone increasing it's power output to establish a voice call, which requires much more power than a data keep-alive/get messages connection.

    It's been a long time since I did a deep dive though.

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