Image talk:Gsm network.png
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Some of the labels are not explained, e.g. R. It's unclear which parts of this network are used for voice, which are for data, what protocols are being used on what segments (or even whether they are analog or digital), what a lot of the acronyms mean, which parts of the digram would belong to one's phone company vs. possibly some other company. The acronym forest is too thick for anyone to make heads or tails of this diagram unless they are already familiar with GSM technology, or are willing to spend a chunk of time piecing together a picture. -- Beland 23:17, 27 Dec 2004 (UTC)
- R is incorrect, it should be MS for Mobile Subscriber. One step lower than than would be the Subscriber Identity Module. Cacophony 22:55, 31 October 2005 (UTC)
R is the interface between the ME (the phone) and the TE (the laptop). It's typically implemented over USB or serial. I don't remember what connection methods are actually allowed for it to be called R, but I suspect all. It mostly looks like a modem interface, but various special AT commands are allowed which select networks and send SMSs etc. It's at least partially defined in the GSM standards. Not all phones have conformed to the standards and, for example, many early mobiles needed a special proprietary connection. Mozzerati 10:12, 1 November 2005 (UTC)
