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Engineering
Computer EngineeringNetwork+ Guide to Networks (MindTap Course List)8th Edition
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Your organization has just ordered its first T1 connection to the Internet. Prior to that, your organization relied on a DSL connection. Which of the following devices must you now have that your DSL connection didn’t require? a. Modem b. CSU/DSU c. Switch d. Hub e. Router

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Network+ Guide to Networks (MindTa...

8th Edition
Jill West + 2 others
Publisher: Cengage Learning
ISBN: 9781337569330

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Network+ Guide to Networks (MindTa...

8th Edition
Jill West + 2 others
Publisher: Cengage Learning
ISBN: 9781337569330
Chapter C, Problem 30MC
Textbook Problem
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Your organization has just ordered its first T1 connection to the Internet. Prior to that, your organization relied on a DSL connection. Which of the following devices must you now have that your DSL connection didn’t require?

  1. a. Modem
  2. b. CSU/DSU
  3. c. Switch
  4. d. Hub
  5. e. Router

Program Description Answer

 Consider the organization depends on DSL connection in which the CSU/ DSU device is not required.

Hence, the correct answer is option “B”.

Explanation of Solution

CSU/ DSU:

  • CSU stands for Channel Service Unit and DSU stands for Data Service Unit.
  • At the customer site, it serves as the connection point for a T1 line.
  • CSU gives termination for the digital signal and it make sure the connection integrity over line monitoring and error correction.
  • The DSU converts the T-carrier frames into frames the LAN (Local Area Network) can interpret and vice versa.
  • The DSL (Digital Subscriber Line) are CSU/ DSU because they transform from one form of digital signal to other form. So, CSU/ DSU devices must have in the DSL connection.

Explanation for incorrect options:

Modem

  • Modem is the combination of the terms modulation and demodulation.
    • Modulation is the process which takes place at the sender’s end; it transforms the digital signal of the computer to the signal that is appropriate for the transmission system being used.
    • Demodulation is the process which takes place at the receiver’s end; it transforms the signal from the transmission system to digital signal.

Hence, the option “A” is wrong.

Switch

  • Switch is used to interconnect multiple workstations on a local area network or interconnect more than one local area network...

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