全球固定网络创新联盟：2026年单通道400G以太网物理层白皮书（英文版）

The rapid scaling of artificial intelligence infrastructure, with training clusters exceeding 10,000 accelerators and communication overhead consuming up to 60% of training time, has made 400 gigabit per second per lane an inevitable requirement for next-generation Ethernet switches. With switch radix constrained by fundamental packaging and thermal limits to approximately 128 ports, achieving switch capacities exceeding 400 terabits per second demands lane speed of over 400 gigabits per seco