Circuit switched transmission entails a dedicated circuit for communication between two dedicated devices.

线路交换传送需要在两个专用设备之间使用专用线路进行通信。

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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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In addition, the transport layer allows IMS devices to make and receive calls to and from the PSTN network or other circuit-switched networks via the PSTN gateway.

此外，传输层允许IMS设备通过PSTN网关呼叫PSTN网络或其他电路交换网络和接收来自这些网络的呼叫。

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Their conclusion is that the switching and transmission costs for IP-based telephone networks are much lower than for switched circuit telephone networks.

CNN: IP telephony is the "in" thing these days, but should it be?

They then analyze how the remaining major cost components, switching and transmission for both types of networks and interconnecting with the switched circuit network for the IP-based networks, change with the change in technology.

CNN: IP telephony is the "in" thing these days, but should it be?

So much so that the extra cost of the gateways that will be needed between the two telecommunications worlds do not bring the costs up to the same level as the costs for switched circuit telephone networks.

CNN: IP telephony is the "in" thing these days, but should it be?