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What do you call the communication tools like TV radio computers laptop or any physical object used to communicate?

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    Human beings are the only creatures on the earth who are able to communicate with each other through the medium of language. But humans take this gift to another extent. Distance, time, and physical existence of the person don’t matter in communication these days because they build a communication system through which they can communicate or share data like images, videos, text, files, etc with their loved ones anytime anywhere. Communication is defined as a process in which more than one computer transfers information, instructions to each other and for sharing resources. Or in other words, communication is a process or act in which we can send or receive data. A network of computers is defined as an interconnected collection of autonomous computers. Autonomous means no computer can start, stop or control another computer.

    Components of Data Communication 

    A communication system is made up of the following components:

    1. Message: A message is a piece of information that is to be transmitted from one person to another. It could be a text file, an audio file, a video file, etc.
    2. Sender: It is simply a device that sends data messages. It can be a computer, mobile, telephone, laptop, video camera, or workstation, etc.
    3. Receiver: It is a device that receives messages. It can be a computer, telephone mobile, workstation, etc.
    4. Transmission Medium / Communication Channels: Communication channels are the medium that connect two or more workstations. Workstations can be connected by either wired media or wireless media.
    5. Set of rules (Protocol): When someone sends the data (The sender), it should be understandable to the receiver also otherwise it is meaningless. For example, Sonali sends a message to Chetan. If Sonali writes in Hindi and Chetan cannot understand Hindi, it is a meaningless conversation.

    What do you call the communication tools like TV radio computers laptop or any physical object used to communicate?

    Therefore, there are some set of rules (protocols) that is followed by every computer connected to the internet and they are:

    • TCP(Transmission Control Protocol): It is responsible for dividing messages into packets on the source computer and reassembling the received packet at the destination or recipient computer. It also makes sure that the packets have the information about the source of the message data, the destination of the message data, the sequence in which the message data should be re-assembled, and checks if the message has been sent correctly to the specific destination.
    • IP(Internet Protocol): Do You ever wonder how does computer determine which packet belongs to which device. What happens if the message you sent to your friend is received by your father? Scary Right. Well! IP is responsible for handling the address of the destination computer so that each packet is sent to its proper destination. 

    As we know that data communication is communication in which we can send or receive data from one device to another. The data communication is divided into three types:

    1. Simplex Communication: It is one-way communication or we can say that unidirectional communication in which one device only receives and another device only sends data and devices uses their entire capacity in transmission. For example, IoT, entering data using a keyboard, listing music using a speaker, etc.
    2. Half Duplex communication: It is a two-way communication or we can say that it is a bidirectional communication in which both the devices can send and receive data but not at the same time. When one device is sending data then another device is only receiving and vice-versa. For example, walkie-talkie. 
    3. Full-duplex communication: It is a two-way communication or we can say that it is a bidirectional communication in which both the devices can send and receive data at the same time. For example, mobile phones, landlines, etc.

    Communication Channels

    Communication channels are the medium that connects two or more workstations. Workstations can be connected by either wired media or wireless media. It is also known as a transmission medium. The transmission medium or channel is a link that carries messages between two or more devices. We can group the communication media into two categories:

    • Guided media transmission
    • Unguided media transmission

    1. Guided Media:  In this transmission medium, the physical link is created using wires or cables between two or more computers or devices, and then the data is transmitted using these cables in terms of signals. Guided media transmission of the following types:

    1. Twisted pair cable: It is the most common form of wire used in communication. In a twisted-pair cable, two identical wires are wrapped together in a double helix. The twisting of the wire reduces the crosstalk. It is known as the leaking of a signal from one wire to another due to which signal can corrupt and can cause network errors. The twisting protects the wire from internal crosstalk as well as external forms of signal interference. Types of Twisted Pair Cable :

    • Unshielded Twisted Pair (UTP): It is used in computers and telephones widely. As the name suggests, there is no external shielding so it does not protects from external interference. It is cheaper than STP.
    • Shielded Twisted Pair (STP): It offers greater protection from crosstalk due to shield. Due to shielding, it protects from external interference. It is heavier and costlier as compare to UTP. 

    2. Coaxial Cable: It consists of a solid wire core that is surrounded by one or more foil or wire shields. The inner core of the coaxial cable carries the signal and the outer shield provides the ground. It is widely used for television signals and also used by large corporations in building security systems. Data transmission of this cable is better but expensive as compared to twisted pair.

    3. Optical fibers: Optical fiber is an important technology. It transmits large amounts of data at very high speeds due to which it is widely used in internet cables. It carries data as a light that travels inside a thin glass fiber. The fiber optic cable is made up of three pieces:

    1. Core: Core is the piece through which light travels. It is generally created using glass or plastic.
    2. Cladding: It is the covering of the core and reflects the light back to the core.
    3. Sheath: It is the protective covering that protects fiber cable from the environment.

    2. Unguided Media: The unguided transmission media is a transmission mode in which the signals are propagated from one device to another device wirelessly. Signals can wave through the air, water, or vacuum. It is generally used to transmit signals in all directions. Unguided Media is further divided into various  parts :

    1. Microwave: Microwave offers communication without the use of cables. Microwave signals are just like radio and television signals. It is used in long-distance communication. Microwave transmission consists of a transmitter, receiver, and atmosphere. In microwave communication, there are parabolic antennas that are mounted on the towers to send a beam to another antenna. The higher the tower, the greater the range.

    2. Radio wave: When communication is carried out by radio frequencies, then it is termed radio waves transmission. It offers mobility. It is consists of the transmitter and the receiver. Both use antennas to radiate and capture the radio signal.

    3. Infrared: It is short-distance communication and can pass through any object. It is generally used in TV remotes, wireless mouse, etc.

    Literacy
    The ability to identify, understand, interpret, create, communicate and compute, using printed and written materials associated with varying contexts. Literacy involves a continuum of learning, wherein individuals are able to achieve their goals, develop their knowledge and potential, and participate fully in their community and wider society.

    Media
    The physical objects used to communicate with, or the mass communication through physical objects such as radio, television, computers, film, etc. It also refers to any physical object used to communicate messages.

    Physical objects used to communicate including mass media (radio, television, computers, film, etc.). Traditionally, media are the source of credible information in which contents are provided through an editorial process determined by journalistic values and where editorial accountability can be attributed to an organization or a legal person. In more recent years the term ‘media’ is often used to include new online media.

    Media Literacy
    The ability to access, analyze, evaluate, and create media in a variety of forms. It aims to empower citizens by providing them with the competencies (knowledge and skills) necessary to engage with traditional media and new technologies.

    Information
    A broad term that covers processed data, knowledge derived from study, experience, instruction, signals or symbols.

    Information Literacy
    The ability to recognize when information is needed, and to locate, evaluate, and effectively communicate information in its various formats. It includes the competencies to be effective in all stages of the lifecycle of documents of all kinds, the capacity to understand the ethical implications of these documents, and the ability to behave in an ethical way throughout these stages.

    Technology Literacy
    The ability of an individual, either working independently or with others, to responsibly, appropriately, and effectively use technological tools. Using these tools an individual can access, manage, integrate, evaluate, create and communicate information.

    Media and Information Literacy
    The essential skills and competencies that allow individuals to engage with media and other information providers effectively, as well as develop critical thinking and life-long learning skills to socialize and become active citizens.

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