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1653+ standards in database
1653 result(s) found
2048kbit/s 30路脉码调制分插设备技术要求与测试方法
Performance andtest methods of 30-channel pulse code modulation drop/insert equipment at 2048kbit/s
地面无线电接力系统所用设备的测量方法 第一部分:分系统和仿真无线电接力系统通用的测量 第四节 基带范围的测量
Methods of measurement for equipment usedin terrestrial radio-relay systems--Part 1:Measurements common to sub-systems and simulated radio-relay systems--Section four--Measurements in the baseband
地面无线电接力系统所用设备的测量方法 第二部分:分系统的测量 第三节 射频分支网络
Methods of measurement for equipment used in terrestrial radio-relay systems--Part 2:Measurements for sub-systems--Section three--R.F. branching networks
地面无线电接力系统所用设备的测量方法 第二部分:分系统的测量 第六节 分集、双路和热备用设备
Methods of measurement for equipment used in terrestrial radio-relay systems--Part 2:Measurements for sub-systems--Section six--Diversity，twin-path and hot stand-by equipment
地面无线电接力系统所用设备的测量方法 第一部分:分系统和仿真无线电接力系统通用的测量 第二节 射频范围的测量
Methods of measurement for equipment usedin terrestrial radio-relay systems--Part 1:Measurements common to sub-systems and simulated radio-relay systems--Section two--Measurements in the radio-frequency range
纤维光学调制器 第一部分:总规范 (可供认证用)
Fibre optic modulators--Part 1:Generic specification
纤维光学分路器 第三部分:分规范 1至n个波长复用器／解复用器 (可供认证用)
Fiber optic branching devices--Part 3:Sectional specification--One-to-n wavelength multiplexer/demultiplexer
高保真头戴耳机最低性能要求
Minimum performance requirements on high fidelity head phones
数字通信设备环境试验方法
Environmental test methods for digital communication equipments
数字微波接力通信设备通用技术条件
Generic specification for digital microwave radio relay communication equipment
120路海底同轴电缆载波电话设备技术要求
Performance requirements for 120-channel submarine coaxial cable carrier telephone equipment
增量调制终端设备技术要求
Performance requirement of the delta medulation equipment
数字通信设备的可靠性要求和试验方法
Reliability requirements and test methods for digital communication equipment
24路海底同轴电缆载波电话设备技术要求
Performance requirements for 24-channel submarine coaxial cable carrier telephone equipment
120路海底同轴电缆载波电话设备测试方法
Measurement methods for 120-channel submarine coaxial cable carrier telephone equipment
24路海底同轴电缆载波电话设备测试方法
Measurement for 24-channel submarine coaxial cable carrier telephone equipment
增量调制终端设备测量方法
Methods of measurement for the delta modulation equipment
机载多普勒导航系统通用技术条件
General specification for airborne doppler navigation systems
数字交换机的时钟和同步设备进入数字网的兼容性测试方法
Compatibility test procedures of clock and synchronization equipment of digital switch introducedinto digital network
长途光缆通信系统进网要求
Requirements for long haul optical fiber cable systems joined to national public telecommunication network