rowe5 - Chapter 5 Voice Communications Agenda Telephone...

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Chapter 5 Voice Communications
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Agenda Telephone Central office Public Switched Telephone Network Lines Signals Numbering Services Private telephone system Wireless communication
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Telephone Set Transmitter Analog signal Receiver Sidetone Switchhook On-hook and off-hook Dialing Rotary dial Dual-tone-multifrequency (DTMF) or touch tone Ringing Call setup time
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Central Office - I Switching equipment Manual switching Electromechanical switching Step-by-step switches Crossbar switches Electronic switching Reliable One total failure in 40 years Less Labor costs with higher skill levels Design considerations Forecasting demand (time, duration, distance, culture) Grade of service or blocking
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Central Office - II End office or serving central office Toll office or switching office Central hub
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Public Switched Telephone Network Line types Local loop (pair of copper wires: tip and ring) Drop wire Distribution cable Feeder cable Trunk Copper wire Coaxial cable Microwave radio Fiber optic cable Internet line usage problem
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Signal frequency Sine wave Cycle Hertz (Hz): frequency per second Kilohertz (kHz)
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rowe5 - Chapter 5 Voice Communications Agenda Telephone...

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