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 32bit 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 nonnegative 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 31
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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?
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '07
 Kaliba
 Networking, UTP, UTP cord

Click to edit the document details