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Very neat. I recall in the dusty recesses of my mind various settings that you could pass to a modem at call initialisation to force certain speeds, modes, and
by zinckiwi 5y ago
Very neat. I recall in the dusty recesses of my mind various settings that you could pass to a modem at call initialisation to force certain speeds, modes, and other parameters. Did it have to be an actual 2400 baud modem or could you just "step down" the 56k for the same effect?
- nzmsv 5y agoUsually yes, with an AT command: http://www.messagestick.net/modem/Hayes_Ch1-1.html http://www.messagestick.net/modem/Hayes_Ch1-1.html Knowledge of AT commands is still useful today, but the modems are cellular: https://www.twilio.com/docs/iot/supersim/introduction-at-commands https://www.twilio.com/docs/iot/supersim/introduction-at-com...
- HeyLaughingBoy 5y agoJust finished a project last summer with a cell modem, actually. Felt weird using AT commands to make an http connection.
- HeyLaughingBoy 5y agoIt was a one-off I built for a water utility in Connecticut. I'm pretty sure it was an embedded XECOM 2,400bps modem, but I don't remember how I figured out it was faster to do that than to use a 56.6k modem which I would have expected to be faster. Since at 28.8k and higher the modems are negotiating more than just frequencies (phase shifts and bit compression are also negotiated, IIRC), telling a 56k to run at 2.4k should have the same effect.