This section discusses the types of connection used for ISDN as well as the standards ISDN uses to initiate phone connections. Out of all of the chapters in this book, as you will see, this chapter has the most acronyms, making it harder to learn. | CCNA CISCO CERTIFIED NETWORK ASSOCIATE 17 ISDN CERTIFICATION OBJECTIVES ISDN Introduction ISDN Interface Configuration Dialer Profiles and DDR Two-Minute Drill Legacy Dial-on-Demand Routing Q A Self Test 2 Chapter 17 ISDN . . . . hapter 15 introduced you to wide area networks and the first type of WAN connection leased lines using HDLC and PPP. Chapter 16 introduced you to the second type of WAN connection packet-switched connections using Frame Relay. This chapter introduces you to the third type of WAN connection circuit-switched connections. Circuit-switched connections include analog and digital dialup connections. Analog connections use modems while digital connections use ISDN and ISDN hardware for dialup connections. This chapter solely focuses on using ISDN for dialup. The hardware configurations for analog connections are different than for ISDN however the actual dialup commands are the same. Analog dialup is not covered in this book but is covered on Cisco s CCNP Remote Access exam. CERTIFICATION OBJECTIVE ISDN Introduction The Integrated Services Digital Network ISDN is a group of standards that define how voice and data connections can be dynamically set up across digital circuits. Because ISDN uses digital circuits it has the following advantages over analog connections ISDN sets up calls faster Analog takes 30-60 seconds to complete a call while ISDN takes only second or two. ISDN has a guaranteed data rate Analog provides no guarantee for bandwidth on a connection whereas ISDN guarantees 64 Kbps for each connection. ISDN is more suitable to handle different types of services Analog is not good at handling a mixture of voice video and data connections whereas ISDN is. ISDN is a better technology than analog modem dialup connections because of a faster setup time guaranteed data rates and multiple services are handled better. This section discusses the types of connection used for ISDN as well as the standards ISDN uses .
