The Tech Storror

Client-server network Usually when we receive any data, the computer from which we receive the data or service is called server. We are clients or consumers because we serve from it. In this network, both workstation and server computers have the opportunity to work autonomously with their own CPU and memory. It consists of a graphical user interface or front end program on the client workstation and other facilities. It stores the back end server programs of one or more servers. In other words, a suitable network for centrally storing data, ensuring security, running various applications and running the network is a client-server network. In this network, one computer owns the resource, and other computers in the network use those resources. The computer that shares the resource is the server, and the computers that share the resource are the clients. All the resources of the network are stored on the server so the resources can be managed from the center. Security is ensured as all u...

Data Transmission System Asynchronous Transmission: A data transmission system in which characters are transmitted from sender to receiver is called asynchronous transmission. In this method the sender does not require any primary storage medium for data transmission. Main features of asynchronous data transmission: (i) The sender does not require any primary storage device for data transmission. (ii) In this method of data transmission the sender can transmit the data at any time and the receiver can also transmit it. (iii) In this method of data transmission, the time between the transmission of one character and the transmission of another character may vary rather than be equal. (iv) Each character has a start bit at the beginning and end transmission is also called start/stop transmission. Advantages, Disadvantages and Uses of Asynchronous Data Transmission Advantages of asynchronous data transmission: (i) At any time the sender can send data and the receiver can receive it. (ii) ...

Modulation and Demodulation Modulation Audio or video waves received through transducers, known as signal webs, are difficult to transmit over long distances. High frequency carrier waves are used to transmit these signal waves over long distances as radio waves. The amplitude, frequency or phase of this carrier wave is changed according to the instantaneous value of the signal wave. Such changes are called modulation. In other words, mixing the signal with the carrier wave is called modulation. Modulation is mainly of two types, namely Amplitude Modulation (AM) and Frequency Modulation (FM). Use of Modulation: How far a real signal can be transmitted by a transmitter depends on two factors, namely -- (i) Transmitting Frequency (ii) Transmitter Power Modulation is used to send the signal farther. Different types of modulation methods: (1) Amplitude Modulation (AM) (ii) Frequency Modulation (FM) (iii) Pulse Modulation (PM) (iv) Frequency Shift Keying (FSK)  (v) Quadrature Amplitude ...

  Analog and Digital Transmission Analog Signal: The system in which variable signal i.e. the signal can have any meaning at any time, is called analog signal. This signal is used for data processing in analog devices like radio, TV etc. The wave/shape of an analog signal is-- Digital Signal: The level of the signal is variable, i.e. the level of the signal changes over time in a certain step, it is called a digital signal. This signal is used for data processing in digital devices like computers, digital clocks etc. The wave/shape of a digital signal is-- Carrier Signal: Carrier signal is a type of high frequency signal, which is used as a carrier wave to transmit electrical signals to distant places. - The wave/shape of carrier signal is the difference between analog, digital and carrier signal: The difference between analog, digital and carrier signal is given below-- Analog signal (i) A system in which the signal is variable i.e. the signal can have any value at any time, is ca...

Basic Concept on Computer Network Network A network is a system where everyone can share information or work together. For example, suppose the postal department delivers letters across the country. For this the postal department has a nationwide network. They have different offices in different places in this network, there are some rules and regulations. Here every part of the network is working. If the postal department does not have such work then they cannot work. Such networks can be used in the case of computers. Network consists of different devices, which are connected by different communication links. Devices can be computers, printers etc. A computer is part of a network when it is connected to one or more other computers to share information. A minimum of two computers is required to network. Apart from that, the rules of how one computer will communicate with another computer, what their language will be, etc. are specified in advance. Computer network A computer network i...