关键词: 以太网, 眼图, 点密度, 眼幅度, 上升/下降时间

Abstract: The traditional Ethernet eye parameters calculation algorithm is based on the Gauss model of point density statistics. The algorithm assumes that the cumulative frequencies of eye diagram are enough, the distribution of points is sufficiently dense and the voltage distribution of eye vertical fragment fits the Gauss normal distribution. But when the cumulative frequencies of eye diagram are less, the distribution of points is not dense and the voltage distribution on the vertical section does not fit Gauss normal distribution, the results of eye diagram parameters will be a big error. Based on this, this paper puts forward the optimization calculation method of Ethernet eye diagram parameters based on point density. Experimental results show that, this method can calculate the eye amplitude and rise/fall time accurately, and solve the problem of less eye cumulative number and points distributed in the eye diagram parameter calculation effectively.

Key words: Ethernet, eye pattern, point density, eye amplitude, rise/fall time