Modems enable computers to communicate with each other across telephone lines or over cable television network cables. In the strictest sense, a modem is a device that converts between analog signals, such as sound waves, and digital signals, which are used by computers.
Instead of converting between analog telephone lines and digital applications, Integrated Services Digital Network (ISDN) carries digital signals throughout the transmission process. Because an ISDN modem does not convert between digital and analog signals, it does not perform the modulation and demodulation.
Like ISDN, Asymmetrical Digital Subscriber Line (ADSL) permits the transmission of digital data over ordinary telephone lines.
Knowing that, my questions are:
1. What is the role of the modem in ISDN?
2. Does ADSL need a modem? (if the information is transmitted in a digital form it theoretically does not have to be demodulated or anything to be "read" by the computer)
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