UNIVERSITY OF ELDORET DEPERTMEN OF COMPUTER SCIENCE
Networking has changed the way we do business and the way we live. Business decisions have
to be made even more quickly, and the decision makers require immediate access to accura
Whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of
the devices, the link can be shared. Multiplexing is the set of techniques that allow the
simultaneous transmission of multiple signals across a sin
Channelization (or channel partition, as it is sometimes called) is a multiple-access method in
which the available bandwidth of a link is shared in time, frequency, or through code, among
different stations. In this section, we discuss three channelizati
Signals travel through transmission media, which are not perfect. The imperfection causes signal
impairment. This means that the signal at the beginning of the medium is not the same as the
signal at the end of the medium. What is
1 Data communications: Introduction
This lesson presents an introduction to data communications and some basic networking
concepts. You will also learn about the devices required to make networks work.
Objectives: by the end of this lesson, y
When choosing the transmission media, what are the factors to be considered?
Cost and Ease of Installation
Resistance to Environmental Conditions
Quality needed over some estimated distance.
Security may also be an issue.