A) Integral Service Dynamic Network
B) International Subscriber Dialup Network
C) International Service Digital Network
D) Integrated Service Digital Network
E) None of these
Correct Answer: D
Solution :
[d] ISDN stands for Integrated Services Digital Network. It is a set of communication standards for simultaneous digital transmission of voice, video, data. And other network services over the traditional circuits of the public switched telephone network. It was first defined in 1988 in the CCITT red book.
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