除了连接冗余电源外，还可以连接支持容错环状拓扑的特殊电源，即可中断其中任何一个交换机。
In addition to the connection of redundant power supplies, special power supplies support fault-tolerant ring topologies, meaning that a disruption can be restricted to a maximum of one switch.
电话技术中的一种智能专用交换机，可以提供额外的功能，例如除了对打进打出的电话作路由选择外，还可以提供传真、数据库询问等。
In telephone, an intelligent private switchboard which may provide extra facilities, e. g. facsimile, database interrogation, in addition to routing incoming and outgoing telephone calls.
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