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ch03_updated_hw - Homework Updated January 2007 CHAPTER 3...

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Homework Updated January 2007 CHAPTER 3 Physical Layer Propagation UTP and Optical Fiber Last Name: ____________________________________________________ First Name: ____________________________________________________ Due Date: __________________________________ Test Your Understanding 1. a) What is a signal? b) What is propagation? c) What are propagation effects? d) Why are propagation effects bad? 2. a) Give the binary representations for 13, 14, 15, 16, and 17 by adding one to successive numbers (12 is 1100). b) Rounding off, about how many possible addresses can you represent with 32-bit IP addresses? (You probably will need a spreadsheet program to answer this question.) c) If you have four bits, how many possibilities can you represent? d) With four bits, what is the smallest non-negative binary number you can represent? e) What is its decimal equivalent? f) What is the largest binary number you can represent if you have four bits? g) What is its decimal equivalent? 3. a) How many bits does ASCII use to represent keyboard characters? Chapter 3-1
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b) If you transmit “Hello World!” (without the quotation marks) in ASCII, how many bytes must you transmit? c) Your computer screen has a resolution of 800 pixels horizontally and 600 pixels vertically. How many bytes will a JPEG screen image be if there is no compression? Express the file size in proper notation. Use B for bytes. d) How large would the file be with 20:1 compression (which is common)? 4. a) In binary 232 serial port transmission for transmission over a binary transmission line, how are 1 and 0 represented? b) How does this give resistance to transmission errors? c) A signal is sent at 9 volts in a 232 serial port. What fraction of its strength can it lose before it becomes unreadable? d) Today, almost all signaling is binary. Is it correct to call all binary signaling “digital signaling?” e) Is it correct to call all digital transmission systems “binary transmission systems?” Begin the box “Multistate Digital Signaling” 5. a) Distinguish between binary and digital transmission. b) Is binary transmission digital? c) What is desirable about having multiple possible states instead of just two? d) What is undesirable about having multiple possible states?
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