Sunday, June 3, 2007

Question 66

Which is the appropriate description of a basic ISDN interface?

a) The B channel is used for circuit switching, but cannot be used for packet switching.
b) Although the D channel is used for control, it can also be used for transferring packet data.
c) Optical fiber is used without using existing telephone lines.
d) Two DSU units are required in order to use two B channels simultaneously.


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