Copper cables are widely used in telecommunication equipment as data transmitters. One of the problems related to the use of these cables is the corrosion of the cable surface caused by the environmental conditions of the place of use. Corrosion of cable surface leads to change of surface condition and formation of corrosion products on it. In this article, samples of copper cable with a diameter of 0.4 mm have been tested as a telecommunication platform for information transmission. Some parts of this cable that have already been used in the environmental conditions of soil, atmosphere and water environment were prepared. The chemical composition of the corrosion product on the cable surface was identified using X-ray diffraction analysis. On the other hand, the electrical resistance of the investigated cable and a piece of healthy and uncorroded cable were measured using an ohmmeter. Also, to determine the data transfer speed, the desired cable was placed in the path of a modem and the noise and data transfer speed measurement software of ADSL service provider companies was used. The results showed that the corrosion products formed on the surface of the cable are different in different environments. The electrical resistance of the corroded cable in the aqueous environment was the highest value and the lowest value was obtained in the ambient atmosphere. The data transmission speed was the highest in the healthy cable without corrosion and the lowest in the corroded underground cable. It was also proved that the corrosion products on the surface of the corroded cable in the soil are of CuO type and have greatly increased the electrical resistance of the cable and led to an increase in noise and a significant decrease in transmission speed. تفاصيل المقالة