dangxuanzhongzaixianmoshiweiyongyuanzaixianshi，wuxianshujuzhongduanyijiadianhou
，jiujinxingshangxiancaozuo。bingyizhibaochiyushujuzhongxindelianjie。anxuzaixianzezhidangyouyonghushujudaodashicaijinxingshangxiancaozuo，heshujuzhongxindelianjiejiangbaochidaoyigeyonghushedingde“鏈路生命周期”。 “鏈路生命周期”指zhi一yi個ge時shi間jian長chang度du，當dang在zai無wu線xian數shu據ju終zhong端duan與yu數shu據ju中zhong心xin間jian沒mei有you用yong戶hu數shu據ju傳chuan輸shu的de時shi間jian達da到dao該gai時shi間jian長chang度du時shi，則ze進jin行xing下xia線xian操cao作zuo。按an時shi在zai線xian的de上shang線xian操cao作zuo和he下xia線xian操cao作zuo均jun由you用yong戶hu預yu先xian設she定ding的de時shi間jian來lai控kong製zhi。三san種zhong模mo式shi都dou會hui進jin行xing斷duan鏈lian重zhong聯lian。