packet switching services 分封交换服务
Topics summarized here include point-to-point links, circuit switching, packet switching, virtual circuits, dialup services, and WAN devices.
在这里概述的题目包括点对点链路，电路交换，分组包交换，虚电路，拨号服务，和WAN设备。
The transmission method of ATM belongs to fast packet switching mode, and it provides several services such as voice, video and data.
它具有多业务传输特性，能同时传送语音、视频和数据等业务。
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