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。
You can divide the connection into different lines for data and voice communication or use the channel for one high speed data circuit.
用户可以将此连接分为用于数据和语音通讯的不同线路，或将此通道用于高速数据线路。
You can divide the connection into different lines for data and voice communication or use the channel for one high speed data circuit.
用户可以将此连接分为用于数据和语音通讯的不同线路，或将此通道用于高速数据线路。
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