public Crossbar(int speed, Queue []inputBuffers, Queue []outputBuffers)
    {
        //VERTICALBUSES are the number of 'OutputBuffers.length'
        //passes the constructor values to the base class SwitchingFabric
        super(speed, inputBuffers, outputBuffers, outputBuffers.length);
        //indicate has no memory
        hasMemory = false;
        //set the default recent bus
        recentBus = 0;
    }