Optical preform, fiber and cable are the traditional industries of Tongding. It has strong technical advantages in the r&d and production in this field, and has a complete industrial chain. The production capacity of optical fiber and cable ranks the First in the cable industry. With stable and reliable product quality and excellent pre-sale, sale, after-sales services, it becomes important supplier and partner of China mobile, China Telecom and China Unicom, it also obtains network access license of the railway company, Radio and Television, SARFT and State Grid Communication Center, products cover all provinces, municipalities and autonomous regions, and export to overseas.