Development of data communication
human nature. You want to live together as a group to conduct various activities together to communicate with each other creating social work so that there is a society.The work as well as social and political, they are not able to avoid the exchange of information between meetings. When the man has to be the need to have a communication between each other.For example
1.1 communication with the communication code from past tense must rely on substances of a document from one person holding the journey forward to the receiving end, there is a specific code to create awareness, only the recipient and the sender until last year.2379 Sam his mass (Samuel Morse) code can be sent across the Atlantic Ocean, with radio waves called his code which is a code that uses an access point on the scale and it is the symbol of the radio transmission to the remote communicationIn addition to his television and code used to communicate with a long period of time telegraph
1.2 communication with the leader in the year B.E.2419 Alexander was a ham label (Alexander Graham Bell) invention phone to voice communication through the development of this technology is the copper progress is a priority from the start switch terminal.have been developed and widely used grid current phone system that can be used to apply for a digital network that make it possible to send information to be used in conjunction with other co-
.1.3 communications using a computer to develop the computer starts from a centralized processing (centralized processing), such as using the mini-computer, or the computer system franchise, a host (host).Each of the destination station is like the use of resources or call the calculation from the center, and the computer responds to the work later, when there is a development that makes it easy to both microcomputer personal use.PC (Personal Computer:PC), the most widely used both microcomputer quickly because price is not easy to use can be very high when there is easy to use, and provides the use of computer manufacturers.computer networks, it is one way and are very popular.such as the use of electronic mail transfer files searching through the system news and browse to the web and send a message to talk together, etc.
1.4 a communication satellite, using satellite has been sent to its orbit around the world with the broadcast on the go with the movement of the satellite move with the roll of the world, and people on the earth would be seen in the satelliteand the stars, it will be sent to the station for IYR terrestrial destination, one or more of.such as he hid the signal, or the island is in the sea, etc.
1.5 a communication system with wireless communication, mobile phones are being cut because of the popular mobile phone is a convenient, flexible communications with this radio waves by using the transfer station will contact the centerIt is called a wireless phone system that this cellular phone (cellular phone) development of wireless systems can also be applied on top of these, such as in many other computer networking or called wireless LAN(paging), etc. computer technology has been developed as a large computer such as a mainframe, mini-computer, both microcomputer development are small in size but it has a high-performance.Your computer until you can work together as a group, so the development work in the format, computer computer network
In the past, computer sales chain, a large computer and brought it to a service station or called the Service Provider (server), and the various agencies both microcomputer according to the guests (Client) with a network (merwork).current computer network is to link many of the computer in order to take advantage of shared resources to maximize the benefits
computer network gained importance and more and more popular because it can create computer system that is suitable for each type of work in a small business that does not have the ability to buy a computer with a high-priced investment such asThey can be used to link multiple function microcomputer network.
development of computer technology.One of the function microcomputer, a service station, the use of any content, when he was able to expand business thrive. network by increasing the number of computer users.In today's large organizations can reduce the investment by using computer network link from many small-group group function microcomputer including a computer network of the organization.as follows:
1. make the work together as a group and can make sesame
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