Question

. Which of the following devices is used to prepare the digital data for transmission over the PSTN? A. ISDN modem B. CSU/DSU C. Modem D. NIC

    . Which of the following devices is used to prepare the digital data for transmission over the PSTN?
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 23

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Step 1: Understand the question - The question is asking which device is used to prepare digital data for transmission over the Public Switched Telephone Network (PSTN). Show more…

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. Which of the following devices is used to prepare the digital data for transmission over the PSTN? A. ISDN modem B. CSU/DSU C. Modem D. NIC

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Key Concepts

Modulation and Demodulation

Modulation involves converting digital signals into analog signals, while demodulation converts received analog signals back into digital form. This process is essential when transmitting digital data over networks like the PSTN that inherently handle analog transmissions.

Modem

A modem is a device that performs the critical functions of modulation and demodulation. It takes digital data produced by computing devices, converts it into analog signals suitable for transmission over the PSTN, and then reconverts incoming analog signals back into digital data, enabling proper communication between digital and analog systems.

Public Switched Telephone Network (PSTN)

The PSTN is the traditional circuit-switched network designed primarily for analog voice communications. It carries signals over telephone lines and requires conversion of digital data into analog signals for transmission, making it crucial to understand the nature of the medium when preparing digital data for communication.

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