M Network 5.5.2 Physical Channels 5.5.3 Logical Channels Operation of the GSM Network 5.6.1 Location Update 5.6.2 Mobile Call 5.6.3 Handover or Handoff 5.6.4 GSM Security Functions 5.6.5 GSM Enhanced Data Services Contents 5.7.1 GPRS Network Structure 5.7.2 GPRS Network Elements 5.7.3 Operation of GPRS Problems and Review Questions References Data Communications Principles of Data Communications 6.1.1 Computer Communications 6.1.2 Serial and Parallel Data Communications 6.1.3 Asynchronous and Synchronous Data Transmission Circuit and Packet Switching 6.2.1 Circuit Switching 6.2.2 Packet Switching 6.2.3 Layer 3 Routing and Routers 6.2.4 Switching and Routing Through Virtual Circuits 6.2.5 Polling Data Communication Protocols 6.3.1 Protocol Hierarchies 6.3.2 Purpose and Value of Layering 6.3.3 Open Systems Interconnection (OSI) 6.3.4 TCP/IP Protocol Stack 6.3.5 Data Flow Through a Protocol Stack Access Methods 6.4.1 Voice-Band Modems 6.4.2 6.4.3 6.4.4 Cable TV Networks 6.4.5 Wireless Access 6.4.6 Fiber Cable Access 6.4.7 Leased Lines and WANs Introduction to Telecommunications Network Engineering 6.5.1 LAN Technologies and Network Topologies 6.5.2 Multiple-Access Scheme of the Ethernet 6.5.3 CSMA/CD Network Structure 6.5.4 Frame Structure of the Ethernet 6.5.5 CSMA/CD Collision Detection 6.5.6 Twisted-Pair Ethernet 6.5.7 Switched Ethernet Switches and Bridges 6.5.8 Fast Ethernet 6.5.9 Autonegotiation 6.5.10 Gigabit Ethernet 6.5.11 Upgrade Path of the Ethernet Network 6.5.12 Virtual LAN The Internet 6.6.1 Development of the Internet 6.6.2 Protocols Used in the Internet 6.6.3 Bearer Network Protocols for IP 6.6.4 Internet Protocol 6.6.5 Address Resolution Protocol 6.6.6 Routing Protocols 6.6.7 6.6.8 Structure of Internet and IP Routing 6.6.9 Host-to-Host Protocols 6.6.10 Application Layer Protocols 6.6.11 6.6.12 Voice over IP (VoIP) 6.6.13 Summary Frame Relay 6.8.1 Protocol Layers of ATM 6.8.2 Cell Structure of ATM 6.8.3 Physical Layer of ATM 6.8.4 Switching of ATM Cells 6.8.5 Service Classes and Adaptation Layer Con