This problem is because you are using the wireless terminal equipment of telecom, this device can transmit wireless signals, your computer room is connected to this device through wireless signals, at this time, the wireless signal is equivalent to a network cable, when your computer is connected to the device, you can dial up the Internet, when you turn off the wireless switch, Equivalent to your computer at this time is not and this device want to connect, it can be understood that there is no connection between the network cable and the computer, this time you are sure to dial up, and there is no network, unless you find a network cable to connect the cat and your computer's wired network card.
When there is no network cable, it is your computer's wireless card that receives the signal transmitted by the wireless terminal.
You turn off the wireless, the computer can't receive any signal, definitely can't access the Internet! I hope I can help you!