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The GSM network is the basis for the worldwide transmission of voice, data and short messages to mobile terminal devices. For industrial applications data are sent using the following services:
CSD - Data traffic in a voice channel (as with a conventional modem)
SMS - Receiving and sending short text messages
GPRS/EDGE - packet-based data service, usually connected to the Internet
GPRS and EDGE offer higher data rates by a dynamic channel bundling and an advantageous billig system based on data traffic. These services are also suitable for realising a very low-cost quasi-dedicated line for frequently sending smaller data packets (e.g. measuring readings).
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