《现代通信系统 第2版》电子教案

现代通讯的来源可以说是从电话初步的，电话满足了大家彼此之间进行信息交换的需要。大家使用电话离不开电话交换机，交换机可以将任意两个电话用户接通。很多交换机连在一起就构成电话交换网，通过这个网，S界各地的电话用户可以彼此通话。

(The source of modern communication can be said to be preliminary from the telephone, and the telephone meets the needs of everyone to exchange information with each other. The use of telephones is inseparable from the telephone exchange, which can connect any two telephone users. Many exchanges are connected together to form a switched telephone network, through which telephone users from all over the world can talk to each other.)

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