3 ms·
I don't know much about Qualcomm's gear for truckers, but FWIW even if the machine does pull its time data over the cellular network (possible on CDMA, less lik
by sethhochberg 7y ago
I don't know much about Qualcomm's gear for truckers, but FWIW even if the machine does pull its time data over the cellular network (possible on CDMA, less likely - impossible? - on GSM), the cell tower itself likely relies on GPS for its own time sync. Its very common for GPS to be used as a globally-accurate source of time data even in applications that have nothing to do with location.
- toast0 7y agoGSM also provides a time reference. I seem to recall connecting to some networks that didn't provide it though. Base stations should be using GPS (and others) to discipline a local oscilator that should be ok enough for a while in absence of signal. They can probably also get a timing signal from their backhaul. It works better with precise timing, but I think it's workable with best efforts.