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通信网络的现状目前世界通信网络是一个多网并存的状态。对网络有各种分类方法,如广域网(WAN-Wide Area Network)、局域网(LAN-Local Area Network)、公用网(Public Network)、专用网(Private Network)等,还有移动通信网、卫星通信网、有线电视网等等。公用网公用网是一个广域网(WAN),是一个覆盖面积非常大的通信网络,我国目前为用户提供服务的公用通信网主要有下面几个:1、电话网:可为用户提供话音、传真、低速数据通信等业务。是使用最广泛、最普及的通信网。2、分组交换网(CHINAPAC):可为用户提供速率不大于64Kbps的使用专线或拨号方式的数据通信业务,通常使用X.25协议通信。
The current status of communications networks The current world communications network is a multi-network coexistence of the state. There are various classification methods for the network, such as a wide area network (WAN), a local area network (LAN), a public network, a private network and the like, as well as a mobile communication network, a satellite communication Network, cable network and so on. Public network Public network is a wide area network (WAN), is a very large area of communication network coverage, China currently provides services to users of the public communication network are the following: 1, the telephone network: to provide users with voice, fax, Low-speed data communications and other services. Is the most widely used, the most popular communications network. 2, the packet switching network (CHINAPAC): to provide users with the rate of not more than 64Kbps using green or dial-up data communications services, usually using X.25 protocol communications.