Technical requirements and test methods for ringing , power sources , alarm and distribuing frame in manual toll telephone switching equipments 人工长途电话交换设备铃流电源告警配线设备技术要求和测试方法
Standard for quality inspection and evaluation of petroleum construction engineering . telecommunication engineering toll transit switching equipment installing engineering 石油建设工程质量检验评定标准.通信工程
Standard for quality inspection and evaluation of petroleum construction engineering telecommunication engineering toll transit switching equipment installing engineering 石油建设工程质量检验评定标准通信工程
Low - voltage switchgear and controlgear - part 6 : multiple function equipment - section 1 : automatic transfer switching equipment ; amendment 2 低压开关和控制装置.第6部分:多功能设备.第1节:自动转换开关设备.修改件1
Low - voltage switchgear and controlgear - part 6 : multiple function equipment - section 1 : automatic transfer switching equipment ; amendment 1 低压开关设备和控制设备.第6部分:多功能设备.第1节:自动转换开关设备.修改件1
Low - voltage switchgear and controlgear - part 6 - 1 : multiple function equipment - transfer switching equipment iec 60947 - 6 - 1 : 2005 ; german version en 60947 - 6 - 1 : 2005 低压开关设备和控制设备.第6 - 1部分:多功能设备.转接开
Supporting engineers to manage all switching equipment of different models or from various suppliers depending on the uniform platform . 2 在统一的平台上,实现对多厂商、多类型无绳式人工电话交换设备的集中统一管理。
Zn28a - 12 series vacuum circuit breaker is a kind of indoor high - volt switch equipment of rated volt 12kv , ac three - phase 50hz . the structure of that be divided Zn28 - 12系列高压真空断路器为额定电压12v ,三相交流50hz的高压户内开关设备。
Exs series of open programmable switching equipment provides a complete and powerful basic platform for rapid development of telecom value - added service Exs系列开放式可编程交换机为电信增值业务的快速发展提供了一个完善、强大的基础平台。
Methods of measurement for equipment used in terrestrial radio - relay systems ; measurements for sub - systems ; stand - by channel switching equipment ; identical with iec 60487 - 2 - 2 , edition 1981 地面无线电中继系统设备测量方法.分系统测量.备用信