It can be either or depending on the circuit, here's a link that will help you more:
http://communication.howstuffworks.com/fiber-optic-communications/fiber-optic.htm
Yes they can.
Optic ADSL, or Asymmetric Digital Subscriber Line, typically does not function with optical fiber as it is designed to work over traditional copper telephone lines. ADSL uses electrical signals transmitted over these copper lines to provide internet access. In contrast, fiber optic technology uses light signals transmitted through optical fibers, offering faster speeds and higher bandwidth. For fiber optic connections, technologies like FTTH (Fiber to the Home) or FTTC (Fiber to the Cabinet) are used instead of ADSL.
A modem (modulator-demodulator) converts digital data from a computer into analog signals for transmission over telephone lines or other communication mediums. It modulates digital signals into analog form for sending and demodulates incoming analog signals back into digital data for the computer. This process enables devices to communicate over various types of networks, such as DSL, cable, or fiber-optic connections. Essentially, the modem serves as a bridge between digital devices and the analog transmission infrastructure.
you mean modem? MO-DEM MOdulation / DEModulation. It turns your digital signal into analog, so it can go thru the phone lines to your isp, and then from the phone lines to their server, it converts the analog signal back into digital.
A modem (which stands for Modulator-Demodulator) converts digital data from the computer to analog data compatible with the telephone system. The analog signal is converted back into digital data on the other end of the call.
MOdulate/DEModulate. It converts digital computer signals into analog ones for transmission over analog telephone lines, and then converts the signal back into digital on the other end.
Integrated Services Digital Network (ISDN) lines
To minimize the distortion of analog signals during transmission Because digital lines transmit signals more efficiently across distances than analog lines Because many telephone networks are moving over to digital interfaces
The main difference between these scales it that the digital will give a more accurate and easier to read reading than figuring it out with the lines between the numbers the analog scale. However, the digital scale requires and battery and the analog does not.
These days it's all fiber optic lines. I don't think you will be able to find anyone to do this.
MODEM (Modulator - Demodulator)modulates Digitals signals to Analog to send over Telephone lines and Demodulates Analog signals in Digital Signals.
A modem. Modem is short for mudulator/demodulator. Telephone lines use analog signals which your computer cannot interpret. When analog signals reach a modem however, they are converted to digital signals and then passed to the computer. When sending data, this process is reversed.