Long-distance network way through WAN by DDN X.25 ISDN and the communication by 2M the El line in the meantime are supported . Under this way pronunciation and image may be transmitted simultaneously .
系统 的 组网方式 非常 灵活, 系统 支持通过DDN、 X.25、ISDN等广域网进行的远距离 组网方式、同时也支持2M的E1线路进行通讯,在这种方式下,可同时传递语音和图像。
Using the X.25 packet layer to supply OSI network services for the higher level networks
利用 X.25分组层向高层提供OSI 网络层服务
Through describing the form and topological structure of the national earthquake communication network system this paper briefly introduces some key technological issues in project construction mainly including application of Packet Switching Network ( X.25 ) and Router in network connections ;
系统描述了全国地震通信网络系统构成和拓扑结构,简要介绍了在项目建设中遇到的一些关键技术问题,主要包括:分组交换网( X.25)和路由器在 联网中的应用;
[计] X.25网络