simple AsyncSnrEval
    parameters:
		debug : bool, // debug switch
        transmitterPower : numeric,
		bitrate: numeric,
		headerLength: numeric const,
		carrierFrequency: numeric,
		thermalNoise: numeric,
		pathLossAlpha: numeric,
		sensitivity: numeric;
    gates: 
        in: uppergateIn;
        out: uppergateOut; 
endsimple