A.{1–[∑中斷路數(shù)(路)×設(shè)備故障時(shí)間(mim)]/[配置路數(shù)(路)×全月日歷時(shí)間(mim)]}×100%
B.{1–[∑中斷路數(shù)(路)×本端設(shè)備故障時(shí)間(mim)]/[實(shí)際路數(shù)(路)×全月日歷時(shí)間(mim)]}
C.{[1-∑中斷路數(shù)(路)×本端設(shè)備故障時(shí)間(mim)]/[配置路數(shù)(路)×全月日歷時(shí)間(mim)]}×100%
D.{[∑中斷路數(shù)(路)×本端設(shè)備故障時(shí)間(mim)]/[實(shí)際路數(shù)(路)×全月日歷時(shí)間(mim)]}