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。
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