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Understanding Data Communications: From Fundamentals to Networking

Gilbert Held

Chapter 4

Fundamental Data Transmission Concepts - all with Video Answers

Educators

Chapter Questions

Problem 1

Discuss the function of each of the major elements of a transmission system.

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Problem 2

What is the relationship between each of the three basic types of line connections and the use of that line connection for short or long duration data transmission sessions?

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Problem 3

What is the function of a hybrid installed at a telephone company's central office?

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Problem 4

What is the function of an attenuation equalizer?

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01:18

Problem 5

Assume a flat rate plan results in the cost of a long distance call becoming 12 cents per minute. If a leased line costs $\$ 400$ per month, how many minutes per month must occur over the switched telephone network between two locations prior to the use of a leased line becoming more economical?

Jameson Kuper
Jameson Kuper
Numerade Educator

Problem 6

Discuss the relationship of modems and data service units to digital and analog transmission systems. Why are these devices required and what general functions do they perform?

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Problem 7

Name four types of analog facilities offered by communications carriers and discuss the utilization of each facility for the transmission of data between terminal devices and computer systems.

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Problem 8

Draw the bit sequence 101101 encoded as a unipolar non-return to zero, unipolar return to zero and a bipolar return to zero signal.

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01:13

Problem 9

What are the advantages associated with removing the dc residual voltage from a signal?

Averell Hause
Averell Hause
Carnegie Mellon University

Problem 10

What is the advantage associated with using a 50\% duty cycle to encode digital data?

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Problem 11

Why is transformer coupling used on digital transmission facilities where transmission occurs over metallic conductors?

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Problem 12

What is the function of an alog extension?

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Problem 13

What is the difference between simplex, half-duplex and full-duplex transmission?

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Problem 14

Discuss the relationship between the modes of operation of terminals and computers with respect to the printing and display of characters on a terminal in response to pressing a key on the terminal's keyboard.

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Problem 15

In asynchronous transmission how does a receiving device determine the presence of a start bit?

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Problem 16

What is the difference between asynchronous and synchronous transmission with respect to the timing of the data flow?

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Problem 17

How can a V. 90 modem provide a data transmission rate over the approximate 30 kbps maximum resulting from Shannon's Law?

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Problem 18

What is the difference between serial and parallel transmission? Why do most communications systems use serial transmission?

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Problem 19

Discuss the difference in terminal requirements with respect to point-to-point and multidrop line usage.

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Problem 20

Draw and label three common LAN network topologies.

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Problem 21

Discuss the difference between a line discipline and an access method.

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01:42

Problem 22

Why is the Morse code basically unsuitable for transmission by terminal devices?

Harsh Gadhiya
Harsh Gadhiya
Numerade Educator

Problem 23

What are the bit compositions of the ASCII characters A and a?

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03:39

Problem 24

Assume that your terminal is set to a half-duplex mode of operation and that you access a full-duplex computer system. How many characters will be displayed or printed on your terminal each time you press a character on the keyboard? Why is this number not one?

Adam Conner
Adam Conner
Numerade Educator

Problem 25

Assume you just used a word processor to create a document that you wish to transmit to an associate using an electronic mail system limited to supporting 7-bit ASCII. What should you do to the file which contains the document you wish to transmit?

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