标识符与数字流之间的分配关系由一个分配表定义并且能够随时间而变化，由此允许进行动态复用。

The allocation of an identifier to a digital stream is defined by an allocation table and can vary over time, in such a way as to enable dynamic multiplexing.

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复用开关的一个简单例子就是将单台设备的输出连接到2台仪器，例如一台伏特表和一台频率计数器。

One example of a multiple closure would be to route a single device output to two instruments, such as a voltmeter and a frequency counter.

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