通光线缆：公司的深海电缆正处于市场开拓状态

Group 1 - The company Tongguang Cable is currently in the market development phase for its deep-sea cables, which have not yet reached production capacity [2] - The company has established a joint venture with Yangtze Optical Fibre and Cable Joint Stock Limited Company, focusing on the research, production, and sales of optical fibers and cables [2] - Teams from both companies have officially commenced work on the joint venture [2]