The T900-F is a high-precision fiber-optic frequency transmission device based on a ring network structure. A central station transmits frequency signals through a closed loop and uniformly compensates for phase fluctuations, eliminating the need for individual phase stabilization at each node. This system offers high scalability and low maintenance. The reproduced frequency signal stability reaches 3×10⁻¹⁴@1s and 1×10⁻¹⁶@10,000s, making it suitable for high-precision frequency synchronization applications in basic scientific research, deep space exploration, and high-end equipment.