According to similar ft3 frame format and its checkout mode of dnp data link layer , the relationship between fer ( frame error rate ) and ber ( bit error rate ) , frame length is deduced . the computation formulas of average transmission times and repeat transmission times guaranteeing the correct transmission of telecontrol information are given as well 根據(jù)dnp3 . 0規(guī)約數(shù)據(jù)鏈路層類ft3幀及其校驗(yàn)方式,推導(dǎo)出幀傳輸失敗概率(誤幀率)與通道誤比特率和幀長的關(guān)系,同時給出平均傳輸次數(shù)和重復(fù)傳輸次數(shù)的計(jì)算公式。