The analysis combines the real ONU/OLT device-level power profiles and the number of installed OLT and ONU devices with data traffic and subscriber growth projections for the period 2025–2035. With the growing global deployment of Fiber-to-the-Home (FTTH) networks driven by the demand for ensuring high-capacity broadband services, mobile network operators (MNOs) face challenges of excessive energy consumption (EC) of wired optical access networks (OANs). Whether in dense urban FTTA installations or rural distribution networks, optical fibers must operate under rain, dust, humidity, and extreme. In modern FTTH and FTTx networks, several types of fiber management hardware ensure reliable optical connectivity from the central office to the end user. Fiber closure protects spliced fibers in backbone and feeder lines, fiber box (or fiber distribution box) organizes and splits fibers in. It aims to deepen the understanding of the available technologies and solutions that can help improve the energy efficiency of fixed broadband networks. The WBBA research, data, and information referenced herein (the “WBBA Materials”) are the copyrighted property of WBBA and represent data. Selecting the right fiber distribution box (FDB) is a critical decision for any FTTH, FTTB, or campus PON deployment. As the junction point for fiber terminations and splicing, the FDB ensures signal integrity, simplifies maintenance, and protects delicate fibers from environmental hazards. To ensure consistent performance and longevity, it is essential to adhere to strict technical specifications.