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
Switched current circuit (si) is a new technique for analog sampled data processing.
开关电流(SI)技术是一种新的模拟抽样数据处理技术。
3
Also, the hardware circuit-switched networks need to run effectively are extremely expensive, mostly because voice and data services must be supported on different wires.