Discussion
.............. is used to carry digital data on analog lines.
Answer: A
A modem carries digital data on analog lines.
A modem (modulator-demodulator) converts digital data into an analog signal suitable for an analog channel such as a telephone line, by modulating a carrier with techniques such as FSK, PSK or QAM. At the other end it demodulates the analog signal back into digital data. Because data must flow in both directions, both functions are needed.
A modulator alone or a demodulator alone does only half the job. A multiplexer combines several signals onto one channel; it does not convert digital data to an analog form.
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