China Mobile Unveils Single-Lane 400G Ethernet Tech Framework at Conference
On April 15, China Mobile took the lead in releasing the Single-Lane 400G Ethernet Physical Layer Report at the 2026 Cloud-Network Intelligent Connectivity Conference, systematically proposing a technical framework for single-lane 400G Ethernet physical layer. Today, as the parameter scale of AI large models continues to increase, the demand for high-speed interconnection among GPUs in intelligent computing centers is growing rapidly, urgently requiring greater interconnection bandwidth. GPU interconnection bandwidth has reached 1.6 Tbps. To achieve 3.2 Tbps intelligent computing center interconnection bandwidth, there are two paths: "increasing single-lane rate" and "increasing the number of lanes." With the existing 200 Gbps single-lane approach, 16-lane aggregation is required, imposing significant pressure on ports, heat dissipation, and cabling, making deployment difficult. With single-lane 400 Gbps, only 8-lane aggregation is needed, making it a superior and more feasible solution. Single-lane 400 Gbps is not simply a doubling of the rate, but rather a systematic innovation that breaks through the limits of physical transmission, facing multiple challenges in theory, materials, integration, and industry collaboration.
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