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Communication Networks: Stop and Wait state machine and timing of state transitions

  1. Oct 2, 2011 #1
    1. The problem statement, all variables and given/known data

    Consider the operation of a Stop and Wait DLC system as shown below. The system is using 2-bit sequence numbers.

    [PLAIN]http://img210.imageshack.us/img210/4496/hw2problem3diagram.jpg [Broken]

    <a> Show the state machine from initial state (SN = 00, RN = 00) to the state (SN = 11, RN = 11).

    <b> Show the timing of each state transition in the state machine.



    2. Relevant equations

    None to speak of really.



    3. The attempt at a solution

    <a>

    [PLAIN]http://img262.imageshack.us/img262/1881/2bitstopandwaitstatemac.jpg [Broken]

    Does that look right?



    <b>

    I have no idea. There are duplicate times [itex]t_9[/itex] and [itex]t_{11}[/itex] - is that an error?

    Maybe it's just a list (or table) of what state the machine (i.e. - SN = 01, RN = 10... etc.) is at each time t such that [itex]t_0\,\le\,t\,\le\,t_{13}[/itex]?

    Please help!
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 5, 2011 #2
    Re: Communication Networks: Stop and Wait state machine and timing of state transitio

    The duplicate times [itex]t_9[/itex] and [itex]t_{11}[/itex] are errors. Ignore the first of each since they don't really change the state of the machine anyways.
     
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