Such redundancy makes packet networks-unlike traditional circuit-switched networks-extremely robust.

和传统的电路交换网络相比，这样的冗余性使得报文网络极其健壮。

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It is a new communication technology to transfer multimedia information based on low-bit-rate circuit-switched networks.

基于低速率线路的多媒体通信是建立在普通公用电话网上的一种新的通信技术。

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

ECONOMIST: Internet telephony

Much of the problem is that older circuit-switched networks were designed for one purpose: to connect two callers by opening up a dedicated line between them.

FORBES: Grand illusions

What's more, Capellas has ratcheted up pressure on rivals this year by migrating 10% of MCI's phone calls from old circuit-switched networks--subject to those antiquated access fees--to the Internet, which is free of them.

FORBES: Screaming Match