您要查找的是不是：
- PDN Public switched Data Network 公共交换数据网
- Chinapac, china packet switch data network 公用数据分组交换网
- Facsimile Communication over Packet Switched Data Network 在分组交换数据网上开通传真通信的探讨
- China Packet Switching Data Network 中国分组交换数据网
- On Railway Packet Switching Data Network 建设中的铁路分组交换数据网
- public switched data network 公用交换数据网
- switched data network 交换数据网络
- The firewall sit between the power phone system internal network and the public data network. 防火墙位于强力电话系统内部网络与公共数据网络之间。
- packet switched data network 分组交换数据网
- The theoretical limit for packet switched data is approx. 给被转变数据的小包的理论上的界限是大概。
- circuit switched data network 电路交换数据网络
- An entrance to or exit for a data network. 一数据网络的入口或下一出口
- VPDN? Virtual Private Data Network? 虚拟私用数据网?
- The practice of using an IP data network to transmit voice calls. 使用IP数据网络传输语音呼叫的行为。
- A gateway sits between a telephone system, such as a PBX or a central office switch, and a data network, such as the Internet, and translates calls from one format to another. 网关置于电话系统（如专用小交换机或者电话局内的交换机）和数据网络（如因特网）之间，把电话呼叫从一种格式变成另一种格式。
- A consequence of this is that packet switched data has a poor bit rate in busy cells. 这的一结果是在忙碌的细胞中有贫穷的一点点率的被转变数据的那一个小包。
- As dedicated voice (or data) channels are setup by phones, the bandwidth available for packet switched data shrinks. 如热衷的声音(或数据)，频道是电话的装备,小包可用的带宽转变了数据收缩。
- A gateway sits between a telephone system,such as a PBX or a central office switch,and a data network,such as the Internet,and translates calls from one format to another. 网关置于电话系统（如专用小交换机或者电话局内的交换机）和数据网络（如因特网）之间，把电话呼叫从一种格式变成另一种格式。
- While SS7 deals with non-circuit switched data (messages are transported without a dedicated circuit established for that purpose),the function of the ISDN-UP (ISUP) is to control the circuit-switched voice or data connection services. SS7 是处理非电路交换数据(传输消息时，没有建立用于该目的的专用电路)的，而 ISDN-UP (ISUP) 则实现控制电路交换语音或数据连接业务的功能。
- Digital Data Network(DDN) is a data network designed to transmit data on digita! channels. 数字数据网(DDN)是利用数字信道来传输数据信号的数字传输网。
