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If you don't connect it correctly, the switch is a separate port, and the home fiber modem has a dial-up setting by default, and the two devices cannot be authenticated and dialed together. In addition, you can set up a primary route to dial the number, and another jumper to do the secondary route and set a fixed IP, and that's it.
Another solution is to replace the switch with a router and then connect it to other devices.
Plug it in, and make sure that the IP of the wireless router does not conflict with the IP of the so-called telecom optical modem you said (not the same).
The routing modem cannot be used without a WAN port. You can buy another multi-port router and put it in the optical modem position to connect the optical modem to dial-up the Internet, connect the study and living room network cable to this router, and connect the living room router to this router.
Nowadays, many optical modems have integrated routing functions, so it is possible, but it is not recommended to use them this way, because the routing function of the modems is a bit weak. >>>More
I don't understand what you're saying, but I think it should be fine, the point is whether your network cable is four or eight.
Whether the network cable and your door (the weak current box where the cat and the router are connected) can not move, find a cable in the living room, and connect the end of the weak current box with the crystal head at 2 ends and connect it to the cat. >>>More