Chapter 2
studies Development of communication in the year 2540-2557 who do study and research related documents. To serve as a basis for the study. On the topic of education in the following order
: 1) study the development of communication tools by the year 2540 to 2557
2.) Learn about the communication path to
3.) the type of tool. communication,
education, development communication tool by the year 2540 to 2557
communication tool is intended to do. However, the development of
communication tools available to communicate with people that we want to communicate easily and quickly. Such as mobile phones
before the age of cell phones and PCs. In one era (around 2540), we had to communicate via pager, also known as the exclusive link that is part of the official languages. Pager Rectangular objects Black cloth (first generation) to vibrate every time a new message comes in the air. When pressed, you will see the text displayed on the screen longer. There are various brands Originally Pagers have been popular in the business community and government officials. To communicate in the workplace. Part-time work was used for personal business. And that the pager has a huge role in the radio industry. Most young girls at the time the pager in a relationship together. Instead of writing a letter will not delay the date
of the communication path to
communication data (Data Communications)
Data Communication. Data communication is to transfer or share data (Transmission) between source and destination. Through the electronic device or computer Knicks. Data communication systems, electronic devices or tools required Knicks electronica Knicks to assist in the transfer or moving data. It also requires a medium of data from source to destination. Using computer software program. And the programs that control the flow of information. And operations personnel who will assist in operations and management in different parts. All communications to the success possible with
elements of Data Communication
1. Sender or data transmission equipment (Sender) and recipient or input devices. (Receiver)
sender or the source of the communication data transmission equipment. Have a duty to build data The recipient or input device is the destination for data communication. Has been sent to the device and data transmission may be a device of the same type devices - to receive a second type is DTE (Data Terminal Equipment) and DCE (Data Transmission Equipment) DTE origin and receiving data. Terry may be a printer or computer terminal controls the DCE is a device used to send - receive information generally refers to the DCE modem (Modem) spy satellite dish or microwave, etc.
2. Special Protocol (Protocol. ) and software (Software)
protocol is a method used or regulations. Data communication to the recipient and the sender can understand. Or talk about The software has a duty to make the operations in data communications is based. Program at the approximate pro protocols including X.25, BSC SDLC, HDLC, which you can note the following. The software, including Novell's Netware system LAN, UNIX, MS-DOS, OS / 2 or
3. News (Message) signal electronica Knicks passed in the communication system called News or Information can share information. A four different formats
- voice (Voice) to send this information to be forward-looking statements are not disrupted. The low-speed data transmission
- data (Data) format is certainly a bit of code. Projected amount of data in advance Data transmission will High speed
- Text (Text) There is no exact model. Text type data transmission speeds to deliver
medium
- image (Image) in the form of graphics, such as images, videos or use of more memory. To send data at speeds
four. Medium (Medium) medium as a communication path for data from source to fish, the communications medium may be a wire cord of cable or waves of air, such as a microwave, satellite radio, etc.
, data communications network level
to. communication by computer, will include parties, the sender and recipient and sender, which begins with the parties to submit information through the seventh grade class in the following order
1. Application layer (application) to convert the information in a language understandable to a human machine. Computer savvy with the computer identifies the recipient and the sender
2. The presentation layer (presentation), which converts the information submitted in the form of program recipients understand. The style of language and how to access the information of the sender to the recipient understand the
third. Class segment (session) to determine the extent of the conversation is determined by the sender and recipient are more conversational style that is spoken by one. Or speak at
four. Transport layers (transport), which will monitor and protect data and prevent errors. For more information and the location and sequence of
five. Network layer (network) which transmits data in the form of data (data packet) by a further order of the information and addresses of the
sixth. Data link layer (data link), which will guide channel communications. And a copy is sent to the recipient until the
seventh. The physical layer (physical), which serves to convert the data in the form of a digital signal through an intermediary each category. When the data through the seven steps are taken to keep them in the duties of traffic on the network. To send to the recipient, who must meet all seven as well, but it is moving in the opposite way
communication channel. The media act as a communication channel. Comprising
one. Dial (Telephone Line) communication channels in a computer network known and widely used by households insulated copper wire
2. Thousands line twist A communication line for both home and business organization in which general.
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