Transmission

Transmission

Transmission means transfer or movement of something from one place to another place. In past pigeons were used to transfer the message from one place to the other. With the changing of time another source is used a man that had horse take a message and go to the place personally where the message is dropped. After that a post office is developed and also the transport facility had introduced a man who wants to transfer his message from one place to the other set his envelop in the post boxes. A currier boy picks that envelops and transfer that messages to the destination.

In the world of computer we will discuss how to transfer data from one place to the other through network computer.

A computer network is design for transmission of data from one computer to the other. In this transmission process the transmission media is involved. Some transmission media are described below:

• Wires
• Switches
• Routers
• Modems

These are the most commonly used transmission mediums.

Data or information that are transfer can be many kinds. Because the computer is use highly basis in the world on banking to the transfer of the cash. In property issues the computer is used commonly. People use computer for shopping connecting with the friends and family. That’s why we used many kinds of data or information in computer. Some of which are given below:

→     Audio

→     Video

→     Picture

        →      Documents 

Know the first question that is raised in mind is how this data or information is transfer from one computer to the other.

Answer of this question is:

Information is transfer in the form of electromagnetic signals. This information is need to be converted to the digital signals or analog signals.

Signals can be digital or analog

Analog signals:

Analog signal has continuous value and infinite many levels of intensity over a period of time. As the wave move from point 0 to the point 4 it is passes through and includes an infinite number of values along its path. As shown below:

 Example:

When a person speak a continuous wave is created these signals are analog signals.

Digital Signal: 

Digital signal has discrete value. On the other hand, can have only a limited number of defined values . Although each value can be any number, it is often as simple as 1 and 0.

Example:

Data in a computer memory are stored in digital form like 1s and 0s.

Information is transfer form:

•          Digital-Digital conversion:

                  This technique is used to convert digital data to the digital signal. To accomplished the digital conversion three techniques are used

1.       Line Code

2.       Block code

3.       Scrambling

•          Digital-Analog conversion:

                   This technique is used to convert digital data to analog signal. To accomplished analog conversion two techniques

1.       Analog modulating process

2.       Resultant analog process