ical technology. Chapter 3 looks at tradi- tional broadband architectures, such as SONET/SDH, focusing on the self-healing robustness and OAM&P features. Chapter 4 looks at next- generation SONET and the advantages it affords; a number of new- generation carriers are going this route to provide advanced services. Chapter 5 focuses on optics and Dense Wavelength Division Multiplexing Preface (DWDM), a technology SO far optimized for long-haul use. Chapter 6 looks at a number of other practical applicable technologies for Transparent LAN Service (TLS) delivery, such as Coarse WDM (CWDM). Chapter 7 covers evolving all-optical/intelligent optical networking technologies. Chapter 8 discusses wavelength services managed by Generalized Multi- protocol Label Switching (GMPLS). Chapter 9 discusses Free Space Optics, which some proponents are proposing as a metro access technol- ogy. Finally, Chapter 10 looks at practical design approaches and econom- ics to validate the premise that these evolving technologies and architectures (both the Ethernet and the Next-generation SONET) can be reliably and sustainably deployed in the field. Some ELECs have already filed for Chapter 11 (and others will likely follow), indicating the absolute need for these providers and their CFOs to understand Economics 101. An acronym list is also provided to ensure that the reader has a built-in ref- erence for the expanded names of many of the frequently used acronyms within the book. Its companion, Ethernet-Based Metro Area Networks: Planning and Designing the Provider Network focuses on all the evolving Ethernet- based approaches. The book discusses the metro access/metro core envi- ronment, the market potential, and the required broadband services. Transparent LAN Service (TLS), in particular, is discussed along with a general view of technologies, applications, and opportunities. The book examines rearchitected metro rings and multiservice support, including Gigabit Ethernet (GbE). There is a close look at the performance of Eth- ernet-based