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digital communication lines

Some of the most likely causes for the increased demand for ISDN connections are the wider acceptance of fax machines for private use, the need to have several telephone lines available, and, of course, the widespread use of the Internet as agiobai medium. What is ISDN, what does the system ofter, and for whom is it useful? In this article we exarnine the history and technical features of an ISDN connection.
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