Which of the following statements is true about communication lines used by organizations to connect to the Internet?
a. A T3 line uses two pairs of copper wires to carry up to 24 simultaneous conversations. c. A T3 line is a digital communication link that supports transmission rates of 43–45 Mbps.
b. A T3 line is more widely used than a T1 line. d. A T1 line actually consists of 672 channels, each supporting rates of 64 Kbps.
C
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