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。
2
Many observers reject the idea of polarizing Intranet telephony between bad, old circuit switching and good, new packet routing.
很多观察家摒弃了在坏的、老的电路交换和好的、新的包路由之间极化内部网电话的想法。
3
Soft exchange is one of the core equipment of the next-generation network and also one of the equipment of evolving from circuit exchange network to packet exchange network.