How does internal modem work?

Answer 1

An internal modem converts digital data from a computer into analog signals that can be transmitted over telephone lines and vice versa. It connects to the computer's motherboard through a PCI or PCIe slot, allowing it to communicate with the operating system and applications. When sending data, the modem modulates the digital signals into analog waves, and when receiving data, it demodulates the analog signals back into digital form for the computer to process. This enables internet connectivity over traditional phone lines, allowing for dial-up internet access.