A) Integrated Services Digital Network
B) Integrated Services Double Network
C) Inter Services Digital Network
D) Integrated Server Digital Network
E) None of these
Correct Answer: A
Solution :
[a] ISDN stands for Integrated Services Digital Network, is a set of communication standards for simultaneous digital transmission of voice video, data, and other work services over the traditional circuits of the public switched telephone network. It was first defined in 1988.
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