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Essay Galaxy - What is ISDN?
What is ISDN?
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 transmit a signal across
telephone wires. The voice was carried by modulating an electric current with a
waveform from a microphone. The receiving end would then vibrate a speaker coil
for the sound to travel back to the ear through the air. Most telephones today
still use this method. Computers, however, are digital machines. All information
stored 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,....
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Number Of Pages: 19 |
Number Of Words: 5197 |
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