Assignment on Applications of FDM,WDM,TDM

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TDM

• The Plesiochronous Digital Hierarchy (PDH) system, also known as
• the PCM system, for digital transmission of several telephone calls over the same four-wire copper cable (T-carrier or E-carrier) or fiber cable in the circuit switched digital telephone network
• The SDH and Synchronous Optical Networking (SONET) network transmission standards, that has superseded PDH.
• The RIFF (WAV) audio standard interleaves left and right stereo signals on a per-sample basis
• The left-right channel splitting in use for Stereoscopic Liquid Crystal shutter glasses

FDM:

• FDM can also be used to combine multiple signals before final modulation onto a carrier wave.
• A Television channel is divided into subcarrier frequencies for video, color, and audio. DSL uses different frequencies for voice and for upstream and downstream data transmission on the same conductors, which is also an example of frequency duplex.
• Where frequency division multiplexing is used as to allow multiple users to share a physical communications channel, it is called frequency-division multiple access (FDMA).
• FDMA is the traditional way of separating radio signals from different transmitters.

WDM

• Short for wavelength division multiplexing, a type of multiplexing developed for use on optical fiber.
• WDM modulates each of several data streams onto a different part of the light spectrum.
• Short for Windows Driver Model, a driver technology developed by Microsoft to create drivers that are source-code compatible for Windows 98, 2000, Me and XP.
• WDM works by channeling some of the work of the device driver into portions of the code that are integrated into the operating system.
• All versions of Microsoft Windows after Windows 95 have implemented WDM. Kernel-mode drivers that follow WDM rules are called WDM drivers.