This means that many of the existing connection-oriented or circuit-switched networks will need to be upgraded to support packet-switched data traffic.

这就意味着目前存在的面向连接的和电路交换的网络必须升级，以便能够支持分组交换的数据业务。

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Switched current circuit (si) is a new technique for analog sampled data processing.

开关电流(SI)技术是一种新的模拟抽样数据处理技术。

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Cell phones already have a very low latency digital data path - the circuit switched channel used for voice.

手机上已经存在一个低延迟的数字数据路径—用于语音的线路信道。

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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

At the carrier switching office, the voice is separated from the data and converted back to regular circuit-switched voice.

CNN: Voice over DSL trial passes muster

However, VOIP differs from the usual phone services in that it sends calls as digital packets of information over data networks rather than relying on a dedicated circuit-switched network.

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