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5 July, 16:24

Recall that with the CSMA/CD protocol, the adapter waits K. 512 bit times after a collision, where K is drawn randomly. a. For first collision, how long does the adapter wait until sensing the channel again for a 1 Mbps broadcast channel? For a 10 Mbps broadcast channel?

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  1. 5 July, 17:04
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    Complete Question:

    Recall that with the CSMA/CD protocol, the adapter waits K. 512 bit times after a collision, where K is drawn randomly. a. For first collision, if K=100, how long does the adapter wait until sensing the channel again for a 1 Mbps broadcast channel? For a 10 Mbps broadcast channel?

    Answer:

    a) 51.2 msec. b) 5.12 msec

    Explanation:

    If K=100, the time that the adapter must wait until sensing a channel after detecting a first collision, is given by the following expression:

    Tw = K*512 * bit time

    The bit time, is just the inverse of the channel bandwidh, expressed in bits per second, so for the two instances posed by the question, we have:

    a) BW = 1 Mbps = 10⁶ bps

    ⇒ Tw = 100*512 * (1/10⁶) bps = 51.2*10⁻³ sec. = 51.2 msec

    b) BW = 10 Mbps = 10⁷ bps

    ⇒ Tw = 100*512 * (1/10⁷) bps = 5.12*10⁻³ sec. = 5.12 msec
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