The main revisions include the following：1.In the chapter of General Provisions，the types of voice and data services are refined and the application principles for \
1 General Provisions 2 Terms and Abbreviations 2．1 Terms 2．2 Abbreviations 3 Core Network 3．1 General Requirements 3．2 Switching Subsystem （SSS） 3．3 Intelligent Network （IN） Subsystem 3．4 Core Network of General Packet Radio Service （GPRS） Subsystem 3．5 Equipment Related to PS Domain Application System 4 Base Station Subsystem 4．1 Requirements for Radio Coverage 4．2 Radio Coverage Design 4．3 BTS Type and Capacity 4．4 Channel Configuration 4．5 Carrier/lnterference （C/D Ratio 4．6 Control Equipment for BTS 4．7 Antenna Pole （Tower） 5 Interconnection and Interfaces 5．1 Interconnection 5．2 Main Interfaces of GSM-R System 6 Number Planning 7 Quality of Service （QoS） 8 Mobile Station（MS） 9 Operation & Maintenance and System Support 9．1 Network Management 9．2 Signaling 9．3 Synchronization 9．4 Monitoring 9．5 Data and SIM Card Management 9．6 Special Maintenance Tools and Spare Parts 10 Power Supply Equipment 11 Operation Environment 11．1 Requirements for External Power Supply 11．2 Lightning Protection and Earthing 11．3 Buildings 11．4 Equipment Layout and Wiring Appendix A Calculation Methods for GSM-R Main Interfaces Normative References Words Used for Different Degrees of Strictness
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