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    STDM: Statistical Time Division Multiplexing

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    How does STDM yield more efficient use of the bandwidth

    © BrainMass Inc. brainmass.com December 24, 2021, 4:54 pm ad1c9bdddf
    https://brainmass.com/engineering/electrical-engineering/stdm-statistical-time-division-multiplexing-14796

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    TDM becomes inefficient when traffic is intermittent because the time slot is still allocated even when the channel has no data to transmit. Statistical time division multiplexing was developed to overcome this problem
    For the following reasons, STDM yield more efficient use of the bandwidth.
    A system developed to overcome some inefficiencies of standard time division multiplexing, where time slices* are still allocated to channels, even if they have no information to transmit.
    STDM uses a variable time slot length and by allowing channels to compete for any free slot space.
    It employs a buffer memory which temporarily stores the data during periods of peak traffic. This scheme allows STDM to waste no high-speed line time with inactive channels.
    STDM requires each transmission to carry identification information (i.e. a channel identifier).
    To reduce the cost of this overhead, a number of characters for each channel are grouped together for transmission.
    The scheduler is run once every time slice to choose the next process to run. If the time slice is too short then the scheduler will consume too much processing time but if it is too long then processes may not be able to respond to external events quickly enough.

    Note: time slices (Or "time quantum", "quantum") The period of time for which a process is allowed to run uninterrupted in a pre-emptive multitasking operating system

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 4:54 pm ad1c9bdddf>
    https://brainmass.com/engineering/electrical-engineering/stdm-statistical-time-division-multiplexing-14796

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