The GPON ONU integrates GPON OMCI Stack and is fully compliant with ITU-T G. PON technologies, unlike Ethernet, are not P2P but one-to-many with two device types: ONU (Optical Network Unit)/ONT (Optical Network Terminal) and OLT (Optical Line Terminal). Both devices can be manufactured using the SFP form factor 1. The OLT provides an integrated access box for Passive. Huawei OptiXstar S800E is a miniature Optical Network Unit (ONU) that can be inserted into the Small Form-Factor Pluggable (SFP) port of a camera or Access Point (AP) to provide 10-Gigabit-capable Symmetric Passive Optical Network (XGS-PON) access, meeting video or wireless backhaul requirements. It is a cost-effective GPON customer premises system that provides broadband services with 1244 Mbps upstream and 2488 Mbps downstream by connecting to subscribers' switches or routers. Headquartered in Nanshan district, Shenzhen, with offices in Myanmar and Cambodia. A plug and play solution means you simply plug it into your device, and no special configuration is needed. It is supported by all our SFP products, with any RouterOS. This article provides a deep-dive analysis of ONU technology, including its history, role in PON ecosystems, working principles, components, standards, management, deployment, troubleshooting, and future evolution toward next-generation fiber access.