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IT331-Unit_4_Project

IT331-Unit_4_Project - IT331-02 Unit 4 Assignment 1...

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IT331-02 – Unit 4 Assignment 1 1. Differentiate between Wavelength, Statistical, Time Division, and Frequency Multiplexing. Wavelength Division Multiplexing (WDM) A frequency division technique that assigns input sources to separate sets of frequencies Wavelength division multiplexing multiplexes multiple data streams onto a single fiber-optic line Uses different wavelength lasers to transmit multiple signals at the same time over a single medium. The wavelength of each differently colored laser is called the lambdas. Supports multiple lambdas Wavelength division multiplexing is scalable Each signal carried on the fiber can be transmitted at a different rate from the other signals Dense wavelength division multiplexing combines many (30, 40, 50, 60 or more) onto one fiber Coarse wavelength division multiplexing combines only a few lambdas Relatively expensive and uncommon (White, 2009)

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IT331-02 – Unit 4 Assignment 2 (White, 2009) Statistical Time Division Multiplexing (STDM) A statistical multiplexor transmits only the data from active workstations If a workstation is not active, no space is wasted on the multiplexed stream A statistical multiplexor accepts the incoming data streams and creates a frame containing only the data to be transmitted
IT331-02 – Unit 4 Assignment 3 (White, 2009) To identify each piece of data, an address is included: (White, 2009) If the data is of variable size, a length is also included: (White, 2009) More precisely, the transmitted frame contains a collection of data groups: (White, 2009) A statistical multiplexor does not require a line over as high a speed line as synchronous time division multiplexing since STDM does not assume all sources will transmit all of the time Good for low bandwidth lines (used for LANs)

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• Spring '10
• Weinraub
• Time-division multiplexing, Multiplexing, Wavelength-division multiplexing, division multiplexing, IT331-02 – Unit

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