Concept of data transmission, Computer Networking

Overview of Data transmission network model

A network is a combination of hardware and software that sends data from one location to another. The hardware consists of the physical equipment that carries signals from one point of the network to another. The software consists of instruction sets that make possible the services that we expect from a network.

 When sending data from software to actual physical transmission link (medium), there are several layers. Each layer provides certain services. The Open System Interconnection (OSI) layer model is the international standard, and it has 7 layers.

914_Concept of data transmission.png

Fig. General digital control system

When the digital data is transmitted through real line, these digital data should be converted to either a digital signal or an analog signal. In this project, we will convert a data to a digital signal. There are several conversion methods, and we use one of the simple methods as below.

1918_Concept of data transmission1.png

Fig. Example of signal conversion from digital data

 The waveform pattern of 1V or -1V used to represent the 1s and 0s of a digital data on a transmission channel. Suppose the transmission link is not ideal, some noises can be added to original signal. If the amplitude of the noise follows the normal distribution, the noise is called Gaussian noise.

 

 

375_Concept of data transmission2.png

Fig. 3. Data transmission on noise channel

 The function that generates 'Gaussian noise' will be given, and the argument of the function is SNR (Signal-to-noise ratio) dB(decibel). SNR is defined as the ratio of signal power to the noise power, and SNRdB is defined as 10*Log(SNR). Large SNR means that signal power is relatively higher than noise power, so noise is less effective. If noise is less effective, received data has less error.

Even though sending the data on the channel whose SNR is identical, reliable communication is possible when using error-detecting code or error-correcting code.

 

Posted Date: 2/19/2013 1:04:45 AM | Location : United States







Related Discussions:- Concept of data transmission, Assignment Help, Ask Question on Concept of data transmission, Get Answer, Expert's Help, Concept of data transmission Discussions

Write discussion on Concept of data transmission
Your posts are moderated
Related Questions
What is the juncture at which the CPE ends and the local loop portion of the service starts?  Ans) The demarcation or demarc is the juncture at which the CPE ends and the local

Can I get help for traffic congestion anlysis using GIS

The table below gives a summary of special IP addresses.

How many ways are there to execute VPN architecture?

Your Windows client failed to broadcast to all servers that it has accepted an IP address offer. What step is this in the four-step DORA process? a. Discovery b. Offering c. Reques

What is a Multiplexor

What is the difference between TFTP and FTP application layer protocols? The Trivial File Transfer Protocol (TFTP) allows a local host to obtain files from a remote host but d

Can you explain the Authentication Header (AH) Protocol?

what parameters should i have for the best nfs v4 performance?

State about the Cell sectoring With cell sectoring, a cell is separated into a number of wedge-shaped sectors, each with its own set of channels, typically 3 or 6 sectors per c