停止备份单元的输出会冒控制不同步切换的危险(这会导致输出的突变)。当激活单元发生错误或者掉电时而备份单元的输出使能时,就可能发生此类错误。但是,当如果激活单元错误或掉电并且备份单元的输出使能时,系统的输出被指定到他们默认的连接上。备份单元输出使能的第二个作用是,激活单元确定不同步时的错误列表中的动作哪个是致命的失误。
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