The Huawei SmartAX EA5800 series, including the EA5800-X15, EA5800-X7, and EA5800-X2 models, is designed with a common, distributed architecture. These models represent different chassis sizes (large, medium, and small) to fit various deployment scales, but they share the same control boards and service boards. This compatibility allows for simplified network planning, reduced spare parts inventory, and investment protection for operators, as they can use the same line cards across different-sized chassis.

The statement correctly reflects the hardware design philosophy of the EA5800 product family. Claiming the boards are incompatible would be false, as this compatibility is a key feature and selling point of the platform.

1. Huawei. (2023). SmartAX EA5800 Series OLT Hardware Description. Section 2, "Boards." This document details the various boards supported by the EA5800 platform and specifies their compatibility across the EA5800-X15, EA5800-X7, and EA5800-X2 subracks.

2. Huawei. (2023). Huawei SmartAX EA5800 Series OLT Product Documentation - Product Overview. This overview highlights the shared architecture and board compatibility as a key benefit, stating that "The EA5800 series uses the same software and service boards, reducing the costs of spare parts."