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电话交换技术的发展已有近百年的历史了。最早出现的人工交换机,由话务员根据主叫用户的呼叫接通被叫用户。交换功能由人工来完成。进一步发展出现了自动交换机,最常见的有步进制与纵横制两种,后者优于前者。我国大量使用这两种形式的交换机。随着电子工业的发展又出现了电子式自动交换机,有准电子式与全电子式两种。随着电子技术与计算技术的发展,电话交换技术产生了巨大的变化。交换机由原来的模拟交换进到了数字交换,这使交换机产生了一次飞跃的发展。数字交换机的出现,使原先的电话网变成了数字电话网,这是电话网的一次革命,目前正向着全数字化的电话网方向过渡。
The development of telephone exchange technology has been nearly a hundred years of history. The first appeared in the manual switchboard, by the operator according to the calling user’s call connected to the called user. The exchange function is done by hand. The further development of the emergence of an automatic switch, the most common of the two kinds of stepping and vertical and horizontal system, the latter is better than the former. Our extensive use of these two forms of switches. With the development of the electronics industry there have been electronic automatic exchange, there are two kinds of quasi-electronic and full electronic. With the development of electronic technology and computing technology, the telephone exchange technology has undergone tremendous changes. Switches from the original analog switch into the digital exchange, which makes the switch has taken a leap forward development. The advent of digital switches has turned the old telephone network into a digital telephone network, a revolution in the telephone network that is now making the transition to a fully digital telephone network.