WAN connection types include leased line, circuit-switched, and packet-switched.
WAN连接类型包括专线、电路交换和分封交换。
2
It is a new communication technology to transfer multimedia information based on low-bit-rate circuit-switched networks.
基于低速率线路的多媒体通信是建立在普通公用电话网上的一种新的通信技术。
3
This means that many of the existing connection-oriented or circuit-switched networks will need to be upgraded to support packet-switched data traffic.