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First: Check the status of the optical cat and broadband Observe the optical cat indicator light: red LOS light flashing = fiber optic line failure, contact the operator SMS or call the operator's customer service to check if the bill is overdue If the optical cat is normal, try to restart the optical cat: unplug the power → wait 30 seconds → plug back in After the optical cat restart, wait 2-3 minutes, and then check the router If you can't access the Internet yet, reconfigure the router If you can't access the Internet yet, the computer connects to the router Wi-Fi or directly connects with a network cable Browser access 1......