| 1. | Circuit switched data network , csdn
电路交换数据网 |
| 2. | Packet - switched data network
分封交换式数据网络 |
| 3. | Packet switched data network , psdn
包交换数据网 |
| 4. | Public switched data network
公共交换数据网 |
| 5. | Telecontrol equipment and systems - telecontrol protocols compatible with iso standards and itu - t recommendations - functional profile for providing the connection - oriented transport service in end system connected via permanent access to a packet switched data network
遥控设备和系统.与iso标准和itu - t推荐规程一致的遥控协议.在经由永久性存取与包交换数据网络连接的端系统中提供定向连接传输服务的功能界面 |
| 6. | Telecontrol equipment and systems - part 6 : telecontrol protocols compatible with iso standards and itu - t recommendations ; section 601 : functional profile for providing the connection - oriented transport service in an end system connected via permanent access to a packet switched data network
远程控制设备和系统.第6部分:与iso标准和itu推荐相兼容的传输协议.第601节:经过不变存取与包开关数据网络相连系统定向连接传输协议 |
| 7. | Telecontrol equipment and systems - part 6 - 601 : telecontrol protocols compatible with iso standards and itu - t recommendations - functional profile for providing the connection - oriented transport service in an end system connected via permanent access to a packet switched data network
远动设备和系统第6 - 601部分：与iso标准和itu - t建议兼容的远动协议在通过永久接入分组交换数据网连接的端系统中提供基于连接传输服务的功能协议集 |
| 8. | Information technology - international standardized profile tannnn - connection - mode transport service over connectionless - mode network service - ta1111 ta1121 profiles including subnetwork - dependent requirements for x . 25 packet - switched data networks using virtual calls
信息技术.国际标准数据区tannnn .无连接模式网络服务器上面的连接模式传输服务器. ta1111 ta1121数据区包括用于虚拟传呼的x . 25数据包交换数据网络的子网络相关要求 |
| 9. | Telecontrol equipment and systems . part 6 : telecontrol protocols compatible with iso standards and itu - t recommendations . section 601 : functional profile for providing the connection - oriented transport service in end system connected via permanent access to a packet switched data network
遥控设备及装置.第6部分:与iso标准和itu - t推荐标准相一致的遥控协议.第601节:通过信息包转换数据网络的永久入口连接端系统提供面向连接传输服务的功能剖面 |
| 10. | As requirement changes and technology progresses in telecommunication , the traditional pcm has more drawbacks . at the same time , packet switched data networks has grown significantly in quality of service . ip telephone is pretty promising due to its advantages , such as using statistical multiplexing , high resource usage , flexible bandwidth , multi - user calling , voice and data mixing and so on
传统的电话随着通信业务需求的变化和技术进步，其不足之处日渐突出起来，而与此同时，分组数据网络在网络经济中和业务质量控制方面取得了巨大的进步和发展。 |
