交换单元是集群通信系统中的关键部件，它直接关系到系统性能及可靠性。

Switching unit is a key part in trunking communication system. It concerns the performance and reliability of system.

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由于该通讯单元采用双CPU结构，使所有的数据交换并行进行，因此系统通信速度快。

The communication system has rapid data flows attributed to parallel data transmission by using double CPU.

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