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Physical Layer Multiplexing

Physical Layer Multiplexing - CSCI Computer Networking...

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CSCI - Computer Networking Physical Layer Multiplexing George Blankenship 1 Physical Layer Multiplexing George Blankenship 1 CSCI 232 Computer Networking: Physical Layer Multiplexing George Blankenship Physical Layer Multiplexing George Blankenship 2 Lecture Outline Sharing a medium Multiple dialogs Virtual concurrency FDM Copper medium Fiber medium TDM Digital carrier SONET Statistical multiplexing Cable modem DSL Spread Spectrum Physical Layer Multiplexing George Blankenship 3 Multiplexing
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CSCI - Computer Networking Physical Layer Multiplexing George Blankenship 2 Physical Layer Multiplexing George Blankenship 4 Frequency Division Multiplexing Useful bandwidth of medium exceeds required bandwidth of individual channels Each signal is modulated to a different carrier frequency Carrier frequencies separated so signals do not overlap (guard bands) Channel allocated even if no data Model is broadcast radio Physical Layer Multiplexing George Blankenship 5 Three Voice Band Signals Physical Layer Multiplexing George Blankenship 6 Time Division Multiplexing • Synchronous Transmission period divided into discrete time slots Channel assigned to a time slot Data demand cannot exceed capacity • Statistical Data is divided into discrete packages Package contains channel identity Data demand can exceed capacity
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