rk segments: Service network Terminal devices Edge nodes Packet backbone Access network Control network Processing dimension The related book reference model is shown at the bottom part of Figure 1.10, with the three dimensions on the right-hand side and the triangle at the upper left. A main intention of this book is to use it in courses. We know that many courses are product oriented. It is easy to complement the content of this book with products, for example using Figure 1.11 as a reference. Please observe WLAN as one of the access alternatives. The overall chapter structure becomes: Chapter 1: Introduction Chapter 2: End user needs and demands Chapter 3: Technologies and networks (Appendix on web services) End user Layering Telecom Well-defined network structure business Security Success factors model Services (services, DRM, Network TCP/IP 0-1-2-3 etc.) Processor part of a service Roles Network structure H.248 particular commercial interfaces telecom node Success Layering Service implementation factors Solution services Processing element Increase functionality Processing Distribution Platform service Network interfaces interfaces Other Success factors Terminal network (e2e QoS, security, Content content if any Service network, if any coverage etc.) Applications Service enablers See model to the left Network control and intelligence Access Core connectivity Interconnection Figure 1.10 A comprehensive view of the book contents with the distributed network view at the bottom Service network and IP infrastructure servers Applications Service/User Management IP Infrastructure Service Portals content AAA, notification etc DHCP, DNS etc enablers HSS/HLR Network Support Servers traffic Communication Control Network management Billing/accounting MSC/TSC Server SGSN Control f. CSCF/BGCF Customer care GMSC Server GGSN Control f. MRFC/MGCF TeS Server SIP Server Connectivity network Packet Backbone Corporate Internet WLAN hot spot GSM/GPRS/EDGE GERAN PSTN/ISDN Cable UTRAN Fixed Wireless Access Figure 1.11 Example of a 