2. Cellular Radio Network
3. GSM Carrier Frequencies
4. GSM Voice Codecs
5. GSM Network Structure
6. Subscriber Identity Moudule(SIM)
GSM NETWORK STRUCTURE
* The Base Station Subsystem (the base stations and their controllers).
* the Network and Switching Subsystem (the part of the network most similar to a fixed network). This is sometimes also just called the core network.
* The GPRS Core Network (the optional part which allows packet based Internet connections).
* The Operations support system (OSS) for maintenance of the network..
