This is the structure of GSM network. It gives us a simplified overview of the GSM system.
Now , A GSM system consists of 3 subsystems-
1. RSS : Radio subsystem
2. NSS : Network & switching subsystem
3. OSS : Operation subsystem.
But , a GSM customer only notices a very small fraction of the whole network :
A. The mobile stations(MS)
B. Some antenna masts of the base transceiver stations(BTS)
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