Standard No.:	GB/T 7440-1987
English Name:	Calculating methods and measuring methods for transmission parameters of open-wire communication lines
Chinese Name:	通信明线传输参数的计算方法和测试方法
Chinese Classification:	M30    Communication equipment in general
Professional Classification:	GB    National Standard
ICS Classification:	33.040.50 33.040.50    Lines, connections and circuits 33.040.50
Issued by:	National Bureau of Standards
Issued on:	1987-03-16
Implemented on:	1987-1-1
Status:	abolished
Abolished on:	2005-10-14
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	410.00
Delivery:	via email in 1~3 business day

本标准适用于我国通信明线中分别以铜线、铜包钢线、钢芯铝绞线、铝镁合金线或钢线构成的双线回路通信线路。