220-801 · Question #106
Which of the following translates digital signals into analog for transmission over phone lines?
The correct answer is C. Modem. A modem (modulator-demodulator) performs bidirectional signal conversion: it modulates digital computer data into analog signals for transmission over the PSTN (analog phone lines), and demodulates incoming analog signals back into digital data. This was the foundational…
Question
Which of the following translates digital signals into analog for transmission over phone lines?
Options
- ASAN
- BVoIP
- CModem
- DBridge
How the community answered
(41 responses)- B5% (2)
- C93% (38)
- D2% (1)
Explanation
A modem (modulator-demodulator) performs bidirectional signal conversion: it modulates digital computer data into analog signals for transmission over the PSTN (analog phone lines), and demodulates incoming analog signals back into digital data. This was the foundational technology for dial-up and DSL Internet access. VoIP does the opposite - it converts voice into digital packets over IP networks. A bridge connects network segments at Layer 2. A SAN (Storage Area Network) is a high-speed network dedicated to storage devices.
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