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Which of the following devices is used to connect to digital phone lines? A. ISDN modem B. CSU/DSU C. Modem D. NIC 

    Which of the following devices is used to connect to digital phone lines?
A. ISDN modem
B. CSU/DSU
C. Modem
D. NIC
CompTIA Network plus Certification Study Guide
CompTIA Network plus Certification Study Guide
Glen Clarke 4th Edition
Chapter 3, Problem 22 ↓

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Step 1: Understand the options - ISDN modem: used to connect to Integrated Services Digital Network (ISDN) lines - CSU/DSU: used to connect to digital lines such as T1 or T3 - Modem: used to connect to analog phone lines - NIC: Network Interface Card, used to  Show more…

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Which of the following devices is used to connect to digital phone lines? A. ISDN modem B. CSU/DSU C. Modem D. NIC
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Key Concepts

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Modem
A modem (modulator-demodulator) is an interface device that converts digital data from a computer into analog signals for transmission over analog phone lines, and vice versa. While essential for enabling digital devices to communicate over analog networks, modems are not typically used to connect directly to digital phone lines.
Digital Phone Lines
Digital phone lines are telecommunication channels that transmit information in a digital format, as opposed to analog signals. These lines support high-speed data transmission, provide improved signal quality, and are typically used in modern digital communication networks, such as T1 and ISDN systems.
CSU/DSU
A CSU/DSU (Channel Service Unit/Data Service Unit) is a device that connects a digital circuit, like a digital phone line, to the customer’s digital equipment, such as a router. It serves as an interface that conditions and converts signals between the digital transmission medium and the network equipment, ensuring proper timing, signal regeneration, and adherence to telecommunications standards.
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