To understand the Fast 286, you have to look inside. The chipset is usually a or similar, which is a proven, heat-efficient chip for DOCSIS 3.1.
While newer models now boast Wi-Fi 6 or 6E, the Fast 286 series was a pioneer in bringing robust AC Wi-Fi to the mass market. sagemcom fast 286
A: Only if your fiber provider uses an ONT that outputs Ethernet. You would connect the Ethernet WAN port (Blue) to the ONT. However, the 286 is meant for coaxial cable; it is overkill for FTTH. To understand the Fast 286, you have to look inside