当仲裁器发现有总线请求进入时，就在总线应答线上发送应答信号。
When the arbiter sees a bus request come in, it sends its reply on the bus grant line.
由于我们要在管理控制台创建总线拓扑，因此该拓扑将使用一个总线范围内的缺省应答目的地。
Since we'll create our bus topology with the administration console, that topology will use the single bus-wide default reply destination.
就可用性而言，这个计算系统是一个冗余设计，有两组处理器和总线，能够在主机无应答的情况下在主机和伺服机之间进行切换。
For availability, this computing system was a redundant design, with two sets of processors and buses and the ability to switch between a master and a slave if the master was found to be unresponsive.
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