This telephone drop wire is a twin parallel structure specially designed for outdoor aerial use, including 18/2 and 22/2 gauges, corresponding to conductor cross-sectional areas of 2×0.8mm and 2×1.0mm. It uses copper conductors and PE insulation materials, designed specifically for outdoor telephone signal transmission.​ The conductors are made of high-purity copper, which has excellent electrical conductivity, ensuring minimal attenuation and high stability of telephone signals during transmission. Among them, the current-carrying capacity of the 2×1.0mm conductor is slightly higher than that of 2×0.8mm, which can adapt to transmission requirements of different distances and signal strengths. The insulation layer is made of polyethylene (PE) material, which has excellent weather resistance and can resist the impact of outdoor natural environments such as direct sunlight, wind and rain erosion, and high and low temperature changes. At the same time, it has good electrical insulation, effectively isolating external interference and ensuring the quality of signal transmission.​ The twin parallel structure design makes it easy for aerial installation, which can be directly erected on outdoor carriers such as electric poles and walls. It is widely used in telephone line laying in urban fringe areas and rural areas, as well as outdoor communication wiring in industrial parks and residential communities. Whether it is short-distance user access or medium-distance regional line connection, it can stably play a role in signal transmission, providing reliable line support for outdoor telephone communication.