系统操作简单，系统内的任一话站均能与控制室或其它话站通话，每个话站均有选择任一通话通道的权利。

The system is easy to operate, every station can call to control room or other station and can realize multi-users call in the same time.

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系统内的任一话站均能与控制室或其他话站呼叫通话，每个话站均有选择任一通话通道的权利，系统内每个话站有六个通道，通道间没有干扰或串音。

Every station of the system can call to controlled room and other telephone station and can select every channel. There are six channel in every station and no interfere or noisy within the channel.

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分组交换也有缺点，需要花一些时间将数据“通话”拆分为多个分组，使用不同通道传输这些分组，然后在接收端将分组重新组装。

Packet switching does have the problem that it takes a little time to break up the data "conversations" into many packets, send them on their different ways and then reassemble them at the other end.

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