ineering and technology and its application to wireless networks. In Chapter 11, "The PSTN and Telephone Switching," we look at the basic structure of the PSTN, including the local loop and local access provisioning, PSTN trunks and switches, and private branch exchanges (PBXs). We then take an in-depth look at telephone switches and their functions. With this background, we can present the switching functions that are key to cellular telephone networks, including roaming, paging and registration, all the different types of handoff, and the call statistics that allow us to trace problems and to bill our customers. Chapter 11 provides the tools you need to design and troubleshoot the switches at the mobile switching center (MSC), the nerve center of our cellular network. In Chapter 12, "Telephony Engineering Concepts," we describe the steps of a telephone call and define the issues that determine quality of service. We also describe the architecture and engineering issues significant to wireless telephone networks. In Chapter 13, "Telephone Transport," we introduce the technology that carries telephone calls over distance. After a discussion of the protocols of telephony, we take an in-depth look at wireless system transport, which is the basis of the backhaul network that connects base stations to the MSC. In Chapter 14, "Signaling with SS7," we turn our attention to the system that provides signaling control for the entire worldwide telephone network. We describe the underlying principles and features of the Signaling System 7 (SS7) network and its operational functions. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Key Telephony Concepts Key Telephony Concepts In Chapter 15, "ANSI-41," we introduce and explore ANSI-41, the standard that defines the signaling operations for all code division multiple access (CDMA) networks, both second ge