Dne 25/02/2018 v 21:04 Kevin Kenny napsal(a): > On Sun, Feb 25, 2018 at 2:50 PM, Poutnik <poutnik4n...@gmail.com> wrote: >> SPOT satellite network probably does use the internet protocol suite and >> therefore does use an internet connection. :-) > The satellite network consists of simple 'bent pipe' analog repeaters. > There's no message processing aboard the spacecraft. > The intelligence is all the "gateway" ground stations. > > The SPOT device doesn't do IP; it's got a fairly simpleminded > (simplex transmit only) Qualcomm CDMA chipset. It does SMS > only, and even in the fancier Globalstar devices that can exchange > text messages, the text message is shorter than 140 characters > because part of the message body is a NMEA $GPGLL or > $GPRMC sentence. > > I bet that's more than you wanted to know. :-) > Using analog repeaters would be very dumb thing to do and would not work well. There is no need of msg processing for the digital repeaters, e.g. like in the ethernet network.
The above does not say it does not use internet protocol suite from the network layer above. CDMA is the link layer, similar as for the 3G phone connection. -- Poutnik ( The Wanderer ) My Brouter profiles https://github.com/poutnikl/Brouter-profiles/wiki -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to osmand+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
