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PENN STATE ABINGTON / information science and technology / IST 220 / If a data communication system uses 8 levels of voltage to represent d

If a data communication system uses 8 levels of voltage to represent d

If a data communication system uses 8 levels of voltage to represent d

Description

School: Penn State Abington
Department: information science and technology
Course: Networking and Telecommunications
Professor: Qiang duan
Term: Fall 2016
Tags: Network, telecommunications, and information technology
Cost: 25
Name: IST 220, Homework 2
Description: Week 2 homework
Uploaded: 05/18/2017
4 Pages 90 Views 0 Unlocks
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2/29/2016 Hwk2 (Chapters 5-7) Submitted by PATEL, RAHIL (RSP5196) on 2/5/2016 9:32:25 PM Points Awarded 40.00 Points Missed 80.00 Percentage 33.3%


Suppose an analog signal has a frequency spectrum 1000 Hz to 3000 Hz, according to Nyquist's theory, what is the minimum sampling rate for converting this analog signal to digital signals without losing information?




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If a data communication system uses 8 levels of voltage to represent data, how many data bits can each level represent?



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1. Which one of the following is NOT true about the motivation and scope of data communications? A) information sources can be of arbitrary types B) information can be transmitted at an arbitrary speed C) transmission uses a physical system D) multiple information sources can share the underlying medium Points Earned: 10.0/10.0 Correct Answer(s): B 2. Which one of the following is NOT true about digital signals? A) a digital signal has a fixed set of valid levels B) each level change consists of an instantaneous move from one valid level to another C) a digital signal has infinite bandwidth D) the entire computer network can only use digital signals because data are represented by binary numbers in computers Points Earned: 0.0/10.0 Correct Answer(s): D 3. If a data communication system uses 8 levels of voltage to represent data, how many data bits can each level represent? (Figure 6.8 (a) and (b)) A) 1 bits B) 2 bits C) 3 bits D) 4 bits Points Earned: 0.0/10.0 Correct Answer(s): C4. What is the bandwidth for the analog signal given by Figure 6.5 (frequency domain representation given in Figure 6.6)? A) 1 Hz https://cms.psu.edu/section/default.asp?id=201516SPOZ%5F%5F%5FRIST%5F%5F220%5F001 1/4 2/29/2016 Hwk2 (Chapters 5-7) B) 2 Hz C) 3 Hz D) 4 Hz Points Earned: 0.0/10.0 Correct Answer(s): A 5. If a communication system uses the digital signal given in Figure 6.8(b) (4­level voltage) for data transmission, and 100 signals (different levels) are transmitted in each second, what is the bit rate for this system? A) 100 bits/second B) 200 bits/second C) 400 bits/second D) 800 bits/second Points Earned: 0.0/10.0 Correct Answer(s): B 6. Suppose an analog signal has a frequency spectrum 1000 Hz to 3000 Hz, according to Nyquist's theory, what is the minimum sampling rate for converting this analog signal to digital signals without losing information? A) 1000 samples/second B) 3000 samples/second C) 6000 samples/second D) 8000 samples/second Points Earned: 10.0/10.0 Correct Answer(s): C 7. Pulse code modulation (PCM) refers to a technique ___________________. A) samples an analog signal and converts it into digital form B) enables multiple information sources to share the same transmission medium C) extends data transmission distance D) measures the levels of voltage of a digital signal Points Earned: 10.0/10.0 Correct Answer(s): A8. Which one of the following is the data rate approximation for the popular Category 5 UTP? https://cms.psu.edu/section/default.asp?id=201516SPOZ%5F%5F%5FRIST%5F%5F220%5F001 2/4 2/29/2016 Hwk2 (Chapters 5-7) A) 1 Mbps B) 10 Mbps C) 100 Mbps D) 1 Gbps Points Earned: 10.0/10.0 Correct Answer(s): C 9. Which one of the following is the best medium for data transmission near an antenna with strong radio radiation ? A) twisted pair cable B) coaxial cable C) optical fiber D) microwave radio Points Earned: 0.0/10.0 Correct Answer(s): C 10. Which of the following types of fiber is the best for long distance high­speed data transmission? A) multimode, step index fiber B) multimode, graded index fiber C) single mode fiber Points Earned: 0.0/10.0 Correct Answer(s): C 11. Given a coaxial cable with 100 MHz bandwidth, what is the maximum data rate that can be achieved on this cable in the ideal case (without any noise interference) by a communication systems that uses 4 different signal levels? A) 100 Mbps B) 200 Mbps C) 400 Mbps D) 800 Mbps Points Earned: 0.0/10.0 Correct Answer(s): C12. Given a coaxial cable with 100 MHz bandwidth, what is the maximum data rate can be achieved on this https://cms.psu.edu/section/default.asp?id=201516SPOZ%5F%5F%5FRIST%5F%5F220%5F001 3/4 2/29/2016 Hwk2 (Chapters 5-7) cable by a communication system that has a signal­noise ratio S/N = 3? A) 100 Mbps B) 200 Mbps C) 400 Mbps D) 800 Mbps Points Earned: 0.0/10.0 Correct Answer(s): Bhttps://cms.psu.edu/section/default.asp?id=201516SPOZ%5F%5F%5FRIST%5F%5F220%5F001 4/4
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