YD/T 1623-2007.Monitoring and control supervision system for telecom stations generic specification. 1范围 YD/T 1623规定了通信局(站)图像集中监控系统的系统结构和组成、与其他系统的联动内容

YD/T 1686-2007.Speech Quality and Transmission Performance Requirements and Testing Methods for IP Telephony Terminal Equipment. 1范围 YD/T 1686规定了IP电话终

YD/T 1666-2007.Technical Specification for Long Distance Remote Visual Surveillance System Security. 1范围 YD/T 1666规定了基于IP网络的前端监控设备、监控管理平台、监控中心和远程监控客户端

YD/T 1511-2007.Technical Specification for 2GHz TD-SCDMA/WCDMA CS Video Telephony Service. 1范围 YD/T 1511规定了TD-SCDMA/WCDMA数字蜂窝移动通信网电路域可视电话业务的业务总体特征、功能和

YD/T 1362-2005.Testing methods of the supplementary specification 1 to Store Program Control(SPC). 1范围 YD/T 1362规定了固定网交换机新增业务、新增功能、计费、信令、业务量统计和网管的测试要求

YD/T 1349-2005.Technical Requirements and Testing Methods for 2.4GHz Digital Cordless Telephone Sets. 1范围 YD/T 1349规定了工作频率在2.4000~2.4835CHz范围内的数字无绳电话机

YD/T 1329-2004.Integrated Circuit for The overvoltage and overcurrent protection of telecommunications installations. 1范围 YD/T 1329规定了通信设备过电压过电流保护用集成电

YD/T 1227-2002.The technical specification of multimedia IC card public telephone system. 1范围 YD/T 1227规定了多媒体IC卡公用电话系统的定义及其组成框架;规定了系统中终端、管理中心、通信协议及计费模

YD/T 1189-2002.The technical speifcation of mobile IC card public telephone system. 1范围 YD/T 1189规定了移动IC卡公用付费电话系统的术语和符号、技术要求和测试方法。 YD/T 1189适用于接入我国基于9

YD/T 1142-2005.Technical requirements and testing methods for IP telephony gatekeeper. 1范围 YD/T 1142规定了IP电话网守设备的功能特性、协议要求、业务流程、互通要求、编号要求、性能指标要求、可靠性和可用