The FSU (Field Supervision Unit) is the core on-site acquisition and control device of the telecom power & environment monitoring system. Featuring a 1U rack-mount industrial design, it integrates data acquisition, protocol conversion, local display, and remote control — enabling real-time monitoring, alarm reporting, and intelligent linkage of power and environmental parameters including mains power, distribution, batteries, HVAC, temperature/humidity, smoke, water leakage, and access control. It serves as the key node for intelligent site O&M.