Optical fibre cables - Part 3-30 : outdoor cables - Family specification for optical telecommunicationcablesfor lakes, river crossings and coastal application.
光纤光缆。第3-30部分：室外光缆。湖波、河流渡口和沿岸设施用光学通信光缆的系列规范。
2
Petroleum Jelly filled in TelecommunicationCables: Mainly used as filler for the space of multi-conductor of wire and cable with function of moisture-proof and insulation.
通信电缆填充石油膏系列：主要用于对多导体电线电缆缆芯的空隙进行填充，起防潮和绝缘作用。
3
With the rapid development of telecommunication and network, the demand for symmetrical category cables is fast increasing.