There are two types of transmission: circuit switched and packet switched.

有两种传送方式：线路交换和包交换。

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Many observers reject the idea of polarizing Intranet telephony between bad, old circuit switching and good, new packet routing.

很多观察家摒弃了在坏的、老的电路交换和好的、新的包路由之间极化内部网电话的想法。

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Soft exchange is one of the core equipment of the next-generation network and also one of the equipment of evolving from circuit exchange network to packet exchange network.

软交换是下一代网络的核心设备之一，也是目前电路交换网向分组交换网演进的设备之一。

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Pearse and others dream of unifying the mess, with a box that blends both optics and electronics, fusing the circuit-switched world of phone calls and packet-switched world of Internet data.

FORBES: The God Box

In time, packet networks will almost entirely replace more expensive and less capable circuit-switched networks.

ECONOMIST: Internet telephony

Circuit-switched telephone systems have been replaced by packet-switched networks (most notably the Internet).

FORBES: In Digital Age, U.S. Military Still Stuck With Vietnam-Era Jammers