Sunday, June 3, 2007

Question 69

Which of the following is the appropriate description of DSU?

a) It converts signal formats between digital data transmission lines and terminals.
b) It modulates digital signals to analog signals at the time of data transmission, and also demodulates in the reverse direction.
c) It performs protocol conversion for connecting a non-ISDN terminal to ISDN.
d) The transmission system that uses a host computer performs serial and parallel conversion of data bit strings and error checking.


answer

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