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Transmission Media Sharing

Transmission Media Sharing

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Transmission Media Sharing

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Presentation Transcript

  1. Transmission Media Sharing • When can you share? • High Medium capacity • Why share ? • Less transmission costs • More cost-effective transmissions • How would you share? • Multiplexing

  2. Multiplexing vs. No Multiplexing

  3. Multiplexer

  4. Types of Multiplexing • Frequency Division Multiplexing (FDM) • Wave Division Multiplexing (WDM) • Time Division Multiplexing (TDM) • Synchronous • Asynchronous (Statistical TDM)

  5. Frequency Division Multiplexing • Analog signaling & transmission. • Total bandwidth = sum of input bandwidths + guard bands. • Modulates signals to different frequency • Uses • Radio broadcasting and television

  6. FDM - Multiplexer

  7. FDM - Demultiplexer

  8. TDM - Synchronous

  9. TDM - Asynchronous

  10. Inverse Multiplexing • Takes data stream from one high speed line & breaks it into portions that can be sent over multiple lower speed lines simultaneously.

  11. Multiplexing and Inverse Multiplexing

  12. Analog Services • Analog switched • Dial- up, voice networks • PSTN – Public Switched Telephone Network • Analog Leased • Conditioned Lines

  13. Multiplexing Efficiency • Multiplex signals from lower bandwidth into high bandwidth lines • Many analog lines into fewer bigger channels • FDM used • Hierarchical structure

  14. Analog Hierarchy

  15. Digital Service • Less sensitive to interference • 3 Types Digital Service • Switched/56 Service • DDS - Digital Data Service • DS Digital Signal Service

  16. DS Hierarchy

  17. DS • T Lines are Digital Lines for Digital Transmission to deliver DS Service. • T1 = DS-1 = 1.544Mbps • T2 = DS-2 = 6.312Mbps • T3 = DS-3 = 44.736Mbps • T4 = DS-4 = 274.176Mbps