The wireless wifi router crystal plug is inserted incorrectly and can not be pulled out, it is recommended to call the manufacturer's customer service hotline or cut the network cable, take the router to the computer city maintenance point, and remove the router from the crystal head. The crystal head is an important interface device in the network connection. It is a plastic joint that can be inserted in a fixed direction and automatically prevented from falling off. It is used for network communication and is named \"crystal head\" because of its crystal like appearance. It is used to connect NIC ports, hubs, switches, and telephones.
I don't know if you have a problem with the description, but let me outline it.
1, Optical cat to router: optical cat Gigabit port ---- router WAN port (only one).
2, router - computer: router LAN port (generally four) ---- computer network port. (Ignore this if you don't have a computer)