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。
2
Cell phones already have a very low latency digital data path - the circuitswitched 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。
3
Switched current circuit (si) is a new technique for analog sampled data processing.