Computer Networks and Data Communications
CS642/CS447, Fall
2006
Assignment 2
1- Discuss the differences
between Analog and Digital Signals. List the parameters
used
to represent and describe each of them.
- Analog Signals: Analog signals are the original and the natural expression of information.
Analog signals are defined by their properties: Frequency(f), Period Time (t),
Wavelength(
λ
).
- Digital Signals: An electronic signal transmitted as binary code that can be either the
presence(1) or absence(2) of current, high and low voltages or short pulses at a particular
frequency.
Source: http://www.pcmag.com/encyclopedia_term/0,2542,t=digital+signal&i=41382,00.asp
2- What type(s) of wireless communication system require direct line of sight between
transmitter and receiver? Explain this approach
.
- Microwave Transmission: A point-to-point transmission approach which uses microwaves
traveling from node to node for data transmission. It is usually carried by two microwave
dishes which are aligned with each other.
*Source:
www.about-wireless.com/terms/microwave.htm
This
preview
has intentionally blurred sections.
Sign up to view the full version.
- Infrared: A short-wave transmission technology that is relatively cheap, but cannot pass
through solid objects. It used indoors in many homes and in companies for transmission
and security purposes.
*Source: http://www.plasma.com/remotes
3-
Define
and Evaluate a value
for each of the communication parameters below:
•
The frequency of a signal that completes one cycle in 0.05 second.
This is the end of the preview.
Sign up
to
access the rest of the document.
- Spring '06
- Dr.Frey
- Computer Networks, C Programming, Bit rate, analog signals, maximum data rate, limited radio frequency
-
Click to edit the document details
