Broadband Cable TV Access Networks

Broadband Cable TV Access Networks

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PREFACE Broadband cable TV access networks have been going through a dramatic transformation worldwide since the late 1980s. The technology vision, which was articulated by several visionary industry leaders such as Bill Gates of Microsoft, of qinformation at your finger tipsq has started to become a reality. With the invention and emergence of the Internet and Intranet as the information superhighway, cable subscribers and small businesses did not want to be left behind and were eager for high-speed access. Traditionally, cable TV networks were broadband coaxial networks that offered one-way broadcast of analog video channels. The fundamental understanding of the physics of various opto-electronics devices and components led to the invention and development of key fiber-optics transmission technologies such as high-power directly and externally modulated DFB laser transmitters operating at 1310 nm and 1550 nm, optical fiber amplifiers, and optical receivers. These fiber-optics technologies transformed cable TV network architecture to 750-MHz and greater bandwidth hybrid fiber/coax (HFC) networks. Furthermore, the development of low-cost highly integrated communication chips, modules, and systems such as quadrature amplitude modulation (QAM) modulators, transceivers, and MPEG encoders and decoders, enabled cable operators to introduce many digital video programs to the home using a digital set-top box. Instead of low-speed Internet access using a dial-up modem, high-speed Internet access through cable TV networks is possible using a cable modem either as a stand-alone unit or built into a digital set-top box. The continuing insatiable desire at sometimes accelerating pace for more qbandwidthq and more services on demand has forced the cable TV operators to rethink their two-way HFC network architecture, paving the road toward two-way dense wavelength division multiplexed (DWDM) cable TV networks. From 1992 to 1996 as a research scientist at Bell Communications Research (Bellcore), I had the privilege to work with many world-class scientists and participate in the emerging fiber-optics and QAM receiver technology studies. With a built-in HFC test-bed, my colleagues and I were able to provide valuable technical analysis and auditing services to the Regional Bell Operating Companies such as Pacific Bell and Ameritech, as well as cable TV equipment manufacturers. My exposure to the hardware and software development of digital set-top boxes and cable modems came during my work as a principal scientist at Digital Network Systems, General Instrument from 1996 to 2000. In particular, I was exposed to the various discussions and debates on the different cable TV network and set-top box requirements while participating at the various cable TV standards meetings such as DOCSIS, IEEE802.14, and OpenCable. The purpose of this book is to provide the reader with the basic understanding of today's two-way HFC cable TV network technologies and their evolution toward DWDM network architectures. This book, which can be used as the basis for a graduate-level material, is intended for engineers, scientists, cable TV professionals, and students interested in learning more about the existing and emerging cable TV technologies and applications. The book is organized into five main sections: The first section, which consists of Chapters 1 and 2, provides an overview of the two-way HFC network with the competing access technologies, including digital subscriber line (DSL), fiber-in-the-loop (FITL), direct broadcast satellite (DBS), and multichannel multipoint distribution service (MMDS). Chapter 2 provides basic cable TV systems background, including different analog and digital video modulation formats, cable TV frequency plans, coaxial cable components and systems, and return-path transmission characteristics. The second section of the book, which consists of Chapters 3, 4, 5, and 6, introduces the key fiber-optics transmission technologies, including directly and externally modulated laser transmitters such as distributed feedback (DFB) and YAG laser transmitters operating at both 1310 nm and 1550 nm, optical receivers, and Erbium-doped optical fiber amplifiers (EDFAs). The third section of the book, which consists of Chapters 7 and 8, discusses the hardware architecture with the key components, features, and functionality of end-user home terminals, including cable modems and digital set-top boxes. Chapter 8 also includes a budget link analysis for digital set-top box in the presence of various HFC network impairments. The fourth section, which consists of Chapters 9 and 10, provides an in-depth analysis of single and multiple-wavelength fiber-optics transmission impairments over HFC and DWDM networks carrying both AM-VSB and QAM channels. The emerging two-way DWDM network architecture is also discussed in Chapter 10. The last section, which consists of Chapters 11 and 12, discusses the transmission protocol, the software architecture, and the various applications for the end-user home terminals. This includes the DOCSIS protocol for cable modems, native applications such as electronic program guides (EPGs), TV-based and Internet-based applications such as video-on-demand (VOD), e-mail, and e-commerce for digital set-top boxes. BIOGRAPHY Shlomo Ovadia has earned his B.Sc. in Physics from Tel-Aviv University in 1978, and his M.Sc. and Ph.D. in Optical Sciences from the Optical Sciences Center, University of Arizona in 1982 and 1984, respectively. He spent two years as a postdoctoral fellow at the Electrical Engineering Department, University of Maryland, investigating different III-V optoelectronics materials and devices. In 1987, Shlomo joined IBM at East Fishkill as an optical scientist developing various IBM optical communications and storage products. He joined Bellcore in 1992, where he developed an HFC test-bed, and studied the transmission performance of multichannel AM/QAM video transmission systems. As a project manager and a senior scientist, Shlomo provided technical analysis and consulting services to the Regional Bell Operating Companies as well as to various cable TV equipment vendors. In 1996, Shlomo joined General Instrument as a principal scientist in Digital Network Systems division, where he was developing the next-generation digital set-top boxes for both domestic and international markets. In April 2000, Shlomo joined Intel's Cable Network Operation business unit in San Jose, California, as a principal system architect developing communication products such as cable modems. He is a Senior Member of IEEE/LEOS/Comsoc with more than 60 technical publications and conference presentations. Shlomo served on the technical committees of many IEEE/LEOS conferences, and he is a regular reviewer for various IEEE publications such as Photonics Technology Letters and Journal of Lightwave Technology. Shlomo has eight pending patents, and his personal biography is included in the Millennium edition of Who's Who in Science and Engineering (2000/2001). xiv PrefacePreface xv xiiiThe purpose of this book is to provide the reader with the basic understanding of todaya#39;s two-way HFC cable TV network technologies and their evolution toward DWDM network architectures.

Title:Broadband Cable TV Access Networks
Author:Shlomo Ovadia
Publisher:Prentice Hall - 2001


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