Data communication Aaqib

Data communication Aaqib

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  Data Communication Data CommunicationPage 1 Name: M.Aaqib Imran Class: IX A Subject: Computer Science Data communication is the transmission of data between two points. A data communication system is a collection of hardware and software arranged to communicate information from one location to another. Components of a Communication System
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  Data Communication Data CommunicationPage 2 These are the five basic components of a Communication System  Sender: It is a device which sends message to another device. It is also called the source of the message. It can be computer, telephone, etc.  Receiver: It is the device which receives the transmitted message. It is also called the destination of the message.  Message:It is the data being transmitted. It can be text, graphics, image, sound or video  Transmission medium: It is the physical pathway or channel through which the message travels. Some examples are coaxial cable, Fiber optic cable, Microwave, etc.  Protocol: It is the set of rules between the communicating devices that governs the process of Data Communication. Without a protocol, two devices may be connected but they cannot communicate with each other
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  Data Communication Data CommunicationPage 3 Transmission Media Guided Media: Guided media uses cabling system that guides the data signals along a specific path. Different types of guided media are described below: 1.Twisted Pair Cable: Twisted pair cable consists of pairs of copper wire around one another. Its transmission speed ranges from 2 million to 10 million bits per second to 10 billion bits per second 2.Coaxial Cable:Coaxial cable consists of a thick copper wire surrounded by a thick insulating layer and another conducting layer. Its transmission speed ranges from 200 million bits per second to 500 million bits per second 3.Fiber optic cable: Fiber Optic Cable consists of hair thin transparent wires. It provides high quality transmission at extremely high speed. It is used for Data Transmission over long distances Unguided Media Unguided media signals travel through open space and nothing guides them along any specific path. It has the following examples: 1.Radio Waves: Radio waves are electromagnetic waves that are propagated by antennas. The transmitter sends signals and the receiver receives it. They are invisible and undetected to human beings
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  Data Communication Data CommunicationPage 4 2.Infra Red: Infra Red waves are light energy waves that we cannot see. It is used for short distance communication. They are disrupted by anything or object in their way. 3.Bluetooth: Bluetooth is a wireless communication technology which is commonly used for communication by portable devices. Bluetooth technology can transmit text, image, video, audio, etc. Communication Devices 1. Modem: A modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information. 2. Network Interface Card: A Network Interface Card (NIC) is used to create computer network between computers. It has two types wired and wireless NIC 3. Router: Router is a communication device that is used for wired or wireless communication between computers. It is also used to connect computers to the internet. 4. Switch/Access Point: Switch or access points are used in connecting computers together in a Local Area Network (LAN). Switch is used to form wired and Access Point is used to create a wireless connection