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1653+ standards in database
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话路传真 (三类机) 传输要求
Document facsimile (group 3) transmission requirement
单声和立体声节目传输特性和测量方法
Characteristics and measuring methods for monophonic and stereophonic transmissions
地面无线电接力系统所用设备的测量方法 第一部分:分系统和仿真系统通用的测量 第一节 总则
Methods of measurement for equipment used in terrestrial radio-relay systems--Part 1:Measurements common to subsystems and simulated systems--Section One--General
50比特/秒数据传输要求
Requirements of data transmission at 50 bit/s
长途通信网频分制系统频率比较导频系列
Frequency comparison pilot seriesfor the FDM systems in the toll communication network
电信设备人工控制机构操作方向的标记
Signs of operating directions of manual control mechanism of telecommunication equipments
调频广播发射机技术参数和测量方法 立体声带附加信道
Technical parameters and measuring methods for FM stereophonic broadcasting transmitters with supplementary channel
调频广播发射机技术参数和测量方法 单声和立体声
Technical parameters and measuring methods for FM broadcasting transmitters--Monophonic and stereophonic
脉冲编码调制通信系统系列
Pulse code modulation communication system hierarchy
大容量长距离模拟微波通信干线电话传输干扰容限
Telephone transmission interference allowances for long-distance high-capacity analogue microwave communication systems
通信设备产品包装通用技术条件
General specifications for products packaging of communication equipments
电视视频通道测试方法
Methods of measurement of television video channel
测量视频连续随机杂波用的统一加权网络
Unified weighting network for measuring video continuous random noise
非平衡双流接口电路的电特性
Electrical characteristics for unbalanced double-current interchange circuits
标准调音频率
Standard tuning frequency
电话自动交换网铃流和信号音
Ringing and tone for telephone automatic switching network
电话自动交换网用户信号方式
Subscriber line signalling system for telephone automatic switching network
电话自动交换网多频记发器信号方式
Multifrequency register signalling system for telephone automatic switching network
模拟载波通信系统网路接口参数
Parameters of interface for the analogue carrier systems over the network
电信传输单位 分贝
Telecommunication transmission unit--Decibel