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Re: Tracker

From dave <dave@cyw.uklinux.net>
Newsgroups comp.sys.raspberry-pi
Subject Re: Tracker
Date 2015-10-13 09:59 +0100
Organization A noiseless patient Spider
Message-ID <mvih2e$f8c$1@dont-email.me> (permalink)
References <fe90551155.Alan.Adams@iyonix.adamshome.org.uk> <mvg8f1$khs$1@dont-email.me> <47db681155.Alan.Adams@iyonix.adamshome.org.uk> <irho1b93gqb7vk5mjeuk1v56nksqpr4oe7@4ax.com>

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On 13/10/15 01:12, Dennis Lee Bieber wrote:

> 	Given the nature of GSM, I suspect if a voice connection wouldn't get
> through, neither would an SMS message -- since voice data is digitized for
> GSM, no analog, it is just another data stream.

AIUI, each GSM base station supports one control channel and one or more 
data channels. The control channel is used to signal the mobiles when to 
transmit, while the data channels carry voice. SMS is carried in spare 
capacity within the control channel.

The control channel is engineered to be more robust than the data 
channels, to avoid a 'runaway' mobile transmitting when it shouldn't. 
Hence the observation that text messages get through when voice fails.
-- 
Dave

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Thread

Tracker Alan Adams <alan@adamshome.org.uk> - 2015-10-12 10:20 +0100
  Re: Tracker Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-10-12 08:12 -0400
    Re: Tracker Martin Gregorie <martin@address-in-sig.invalid> - 2015-10-12 16:38 +0000
  Re: Tracker Martin Gregorie <martin@address-in-sig.invalid> - 2015-10-12 12:18 +0000
    Re: Tracker Alan Adams <alan@adamshome.org.uk> - 2015-10-12 13:50 +0100
      Re: Tracker ray carter <ray@zianet.com> - 2015-10-12 14:10 +0000
      Re: Tracker Martin Gregorie <martin@address-in-sig.invalid> - 2015-10-12 17:23 +0000
        Re: Tracker Alan Adams <alan@adamshome.org.uk> - 2015-10-12 18:41 +0100
          Re: Tracker Martin Gregorie <martin@address-in-sig.invalid> - 2015-10-12 19:15 +0000
            Re: Tracker Alan Adams <alan@adamshome.org.uk> - 2015-10-12 21:02 +0100
            Re: Tracker mm0fmf <none@mailinator.com> - 2015-10-12 21:46 +0100
      Re: Tracker Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-10-12 20:12 -0400
        Re: Tracker dave <dave@cyw.uklinux.net> - 2015-10-13 09:59 +0100
          Re: Tracker mm0fmf <none@mailinator.com> - 2015-10-13 19:26 +0100
  Re: Tracker The Natural Philosopher <tnp@invalid.invalid> - 2015-10-12 19:24 +0100
  Re: Tracker franssoa <franssoa@email.invalid> - 2015-10-13 14:55 +0200

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