Integrated services refers to ISDN's ability to deliver at minimum two simultaneous connections, in any combination of data, voice, video, and fax, over a single line.
Multiple devices can be attached to the line, and used as needed. That
means an ISDN line can take care of most people's complete
communications needs (apart from broadband Internet access and entertainment television)
at a much higher transmission rate, without forcing the purchase of
multiple analog phone lines. It also refers to integrated switching and
transmission[3] in that telephone switching and carrier wave transmission are integrated rather than separate as in earlier technology.
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