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ISDN

British  

abbreviation

  1. integrated services digital network: a rapid telecommunications network, combining data transfer and telephony

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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But with ISDN, callers can easily exchange documents, see each other and talk all at the same time.

From Time Magazine Archive

The chief advantage of ISDN, especially for businesses, is that it enables phone users to transmit voices, video images and computer data along the same line simultaneously.

From Time Magazine Archive

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