設(shè)想當SVC_REQ#43起作用時停止備份單元的輸出。停止備份單元的輸出會冒控制不同步切換的危險(這會導(dǎo)致輸出的突變)。當激活單元發(fā)生錯誤或者掉電時而備份單元的輸出使能時,就可能發(fā)生此類錯誤。但是,當如果激活單元錯誤或掉電并且備份單元的輸出使能時,系統(tǒng)的輸出被指定到他們默認的連接上。備份單元輸出使能的第-5個作用是,激活單元確定不同步時的錯誤列表中的動作哪個是致命的失誤。
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