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. 1 The ISO 7-Layer OSI Model 2 GSM Protocols Overview 3 GSM Transmission Protocols GSM Protocols The ISO 7-Layer OSI Model Development of the Open System. (CM) Transmission protocols relate to the physical transportation of raw data across the GSM network and the various protocols associated with this function 3 .GSM Transmission Protocols GSM Transmission. service is identified, user authentication and privacy are considered. GSM Protocols Overview GSM Protocol Layers :GSM protocols are basically divided into three layers: Layer 1: Physical layer Layer