In Huawei smart module monitoring architecture, the UIM20A expansion module is traditionally used to increase device ports so cabinets can connect multiple intelligent components and sensors (for example, door status and environmental sensors). Huawei also provides the intelligent rPDU PDU2000M, whose main control module includes communications and DI interfaces designed to directly cabinet-level intelligent devices for centralized monitoring and management. In Huawei's solution description for rPDU-monitoring networking, the PDU2000M is positioned to replace the expansion-module role, meaning that in applicable scenarios, cabinets can connect monitoring devices through the PDU2000M without deploying an additional UIM20A expansion module. This supports practical connections such as T/H sensors, smart U space managers, and door status/door-access related signals through the PDU2000M interfaces, and then these devices are managed/bound in the controller's smart module view. Huawei O&M guidance also emphasizes avoiding duplicate connections (do not connect the same device to both UIM20A and PDU2000M), aligning with the replacement concept. (Scribd)