Part one of term paper
ISDN, which stands for integrated services digital network, is a system of digitizing phone networks which has been in the works for over a decade. This system allows audio, video, and text data to be transmitted simultaneously across the world using end-to-end digital connectivity. The original telephone system used analog signals to transmi ...

Part two of term paper
... on them is represented by a bit, representing a zero or a one. Multiple bits are used to represent characters, which then can represent words, numbers, programs, etc. The analog signals are just varying voltages sent across the wires over time. Digital signals are represented and transmitted by pulses with a limited number of discrete voltage levels. [Hopkins] The modem was certainly a big breakthrough in computer technology. It allowed computers to communicate with each other by con ...