Introduction and Data Communications
Exercises
Solve the following exercises (from the book). Each exercise will be graded pass/fail, and you need to (a) submit solutions to all exercises and (b) get a passing grade on approx. 75% of the exercises.
- Give six characteristics (each) of Internet stream and message communications.
- What are the three surprising aspects of the Internet’s message delivery semantics?
- Why are sine waves fundamental to data communications?
- Why is an analog signal used to approximate a digital signal?
- Explain how twisted pair cable reduces the effect of noise.
- If you are installing computer network wiring in a new house, what category of twisted pair cable would you choose? Why?
- If two signal levels are used, what is the data rate that can be sent over a coaxial cable that has an analog bandwidth of 6.2 MHz?
- If a telephone system can be created with a signal-to-noise ratio of 40 dB and an analog bandwidth of 3000 Hz, how many bits per second could be transmitted?
- Search the Web and find a constellation diagram for 32QAM. How many points are defined in each quadrant?
- Using Shannon’s Theorem, explain why practical amplitude modulation systems keep the carrier near maximum strength.
Submission
The deadline for submitting your assignment is February 17, 2013, 23:59.
Please send a PDF or HTML document with your solutions to Morgan Ericsson (morgan.ericsson@lnu.se). Include the text 1dv201 homework 1 in the subject. You are allowed to solve the homeworks in groups of two. Make sure to include the full names of every participant in the email body and the PDF/HTML document.
