Part 1 Illustrating Basic Network Concepts With Diagrams
Jose J Campos
May 25, 2015
CMGT 554
Communication Media
Communication media refers to the means of delivering and receiving data or information. The communication media acts as a communication channel for linking various computing devices so that they may interact with each other. Below is a chart that shows the different types of communication media.
Analog and Digital Data Transmission
There are a number of differences between analog and digital transmission, and it is important to understand how conversions between analog and digital occur. Now with the digital age taking over, many people think that analog transmission methods are no longer used. This is a big misconception and certainly not true. To understand analog, let’s first look at this form of transmission.
An analog wave form or analog signal is characterized by being continuously variable along amplitude and frequency.
Digital signal is quite different from an analog signal. The signal is much simpler. Rather than being a continuously variable wave form, it is a series of discrete pulses, representing one bits and zero bits. See the figure below to look at analog and digital signals.
The way ones and zeros are physically carried through a specified network depends on whether the network is electrical, optical or radio. In electrical networks, one bits are represented as high voltage, and zero bits are represented as a low voltage. In optical networks, one bits are represented by the presence of light, and zero bits are represented by the absence of light. The ones and zeros are carried through the network, and the receiving device repackages the ones and zeros to determine and unpack the data contained. The figures below show how data is transmitted in electricity, light, and radio.
COPPER WIRE
RADIO
OPTICAL/LIGHT
OSI Model and Data Communication
Data communication in the OSI model starts with the top layer of the stack at the sending side,
May 25, 2015
CMGT 554
Communication Media
Communication media refers to the means of delivering and receiving data or information. The communication media acts as a communication channel for linking various computing devices so that they may interact with each other. Below is a chart that shows the different types of communication media.
Analog and Digital Data Transmission
There are a number of differences between analog and digital transmission, and it is important to understand how conversions between analog and digital occur. Now with the digital age taking over, many people think that analog transmission methods are no longer used. This is a big misconception and certainly not true. To understand analog, let’s first look at this form of transmission.
An analog wave form or analog signal is characterized by being continuously variable along amplitude and frequency.
Digital signal is quite different from an analog signal. The signal is much simpler. Rather than being a continuously variable wave form, it is a series of discrete pulses, representing one bits and zero bits. See the figure below to look at analog and digital signals.
The way ones and zeros are physically carried through a specified network depends on whether the network is electrical, optical or radio. In electrical networks, one bits are represented as high voltage, and zero bits are represented as a low voltage. In optical networks, one bits are represented by the presence of light, and zero bits are represented by the absence of light. The ones and zeros are carried through the network, and the receiving device repackages the ones and zeros to determine and unpack the data contained. The figures below show how data is transmitted in electricity, light, and radio.
COPPER WIRE
RADIO
OPTICAL/LIGHT
OSI Model and Data Communication
Data communication in the OSI model starts with the top layer of the stack at the sending side,