The timeline of communication systems presents a chronological overview of the most important events in the history of communication systems from the 4th millennium B.C. to the present.
It shows that from the very beginning - the first Sumerian pictographs on clay tablets to today's state-of-the-art technologies - broadband communication via
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DSL connections are high-speed data connections over copper wire telephone lines. As with cable connections, with DSL you can look up information on the Internet and make a phone call at the same time but you do not need to have a new or additional cable or line installed. One of the most prominent DSL services is ISDN (integrated services digital network, for more information click here (