The router s fiber optic port cannot be unplugged

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If you do not have a modem and only a router with PON or ADSL port, try reconnecting the fiber optics or RJ-45 connector. As an experienced technology writer who has covered broadband advancements for over a decade, I aim to provide readers with trustworthy instructions endorsed by industry experts. Unplugging a fiber optic cable from a modem is a task that requires careful handling to avoid damaging the delicate fibers within the cable. Fiber optic cables are different from traditional copper cables, as they use light to transmit data, and the connectors are more sensitive. For routers that show "WAN Port Unplugged" but have only one LED indicator (such as the Archer AX3200, AX11000, AX6000, or C5400), the issue may be a speed negotiation problem. Go to Advanced > Internet > Internet Port Negotiation Speed Setting and force the setting to 100Mbps full duplex.

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