An introduction to the new digital techniques of telephone communication networks, with emphasis on voice applications: voice digitization, digital transmission, digital switching, network synchronization, network control, and network analysis. Presents basic theory and stresses the application and operational aspects of communication systems design. Relates system level design considerations to telephone networks around the world, particularly in North America.
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CHAPTER ONE BACKGROUND AND TERMINOLOGY
CHAPTER TWO WHY DIGITAL?
CHAPTER THREE VOICE DIGITIZATION
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amplitude amplitude modulation analog arrival average bandwidth baseband basic Bell System binary bipolar bit rate blocking probability carrier CCITT channel bank circuit-switched clock code word coder companding connection crosspoints data rate decoder delay delta modulation density designed determined digital signal digital switch digital transmission division multiplexing echo suppressors elastic store encoding Equation equipment erlangs error rate example filter four-wire four-wire circuit frame frequency functions Hence IEEE implemented inlet input interface intersymbol interference jitter kbps line code linear loop lost calls maximum node noise power occur operation output packet pair path phase phase detector power level pulse quantization intervals queue radio ratio receiver referred routing sample values segment servers shown in Figure signal interval slot specific spectrum speech stage synchronization techniques telephone network tion transmission link transmission system transmitted trunk group virtual circuit vocoder voice circuits voice signals waveform