通光线缆：公司业务主要涉及光纤光缆、输电线缆和装备线缆

Core Viewpoint - Tongguang Cable (300265) is a major qualified supplier for key units and research institutes of the State Grid, Southern Power Grid, telecom operators, AVIC Group, Aerospace Science and Technology Group, Aerospace Science and Industry Group, and China Electronics Technology Group [1] Company Overview - The company's business primarily involves optical fiber cables, power transmission cables, and equipment cables [1]