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  • Representation of real numbers and integers

    Representing a number in a computer Representing (or encoding) a number means to express it in binary form. Representing numbers in a computer is necessary in order for it to be able to store and manipulate them. However, the problem is ... Read more

    Encoding
    October 16, 2008 at 09:43 AM
  • The concept of networks

    What is a network? The generic term "network" refers to a group of entities (objects, people, etc.) which are connected to one another. A network, therefore, allows material or immaterial elements to be circulated among all of these ... Read more

    Introduction to Networks
    October 16, 2008 at 09:43 AM
  • Leased lines (T1, T2, T3)

    Leased lines "Leased" lines enable transmission of data at medium and high speeds (64 Kbps to 140 Mbps) by point to point or multipoint connection (Transfix service). In Europe, there are five types of lines distinguished according to ... Read more

    Internet Technologies
    October 16, 2008 at 09:43 AM
  • Private-key (or secret-key) cryptography

    Symmetric encryption Symmetric encryption (also called private-key encryption or secret-key encryption) involves using the same key for encryption and decryption. ... Read more

    Cryptography
    October 16, 2008 at 09:43 AM
  • DB25 connector

    DB25 plugs The DB25 (originally DE-25) connector is an analog 25-pin plug of the D-Subminiature connector family (D-Sub or Sub-D). As with the DB9 connector, the DB25 is mainly used for serial connections, allowing for the asynchronous ... Read more

    Cables and connectors
    October 16, 2008 at 09:43 AM
  • Bluetooth - How it works

    How Bluetooth works Communication principle Establishing connections Bluetooth profiles How Bluetooth works The Bluetooth standard, like WiFi, uses the FHSS technique (Frequency-Hopping Spread Spectrum), which involves splitting the ... Read more

    Bluetooth
    October 29, 2013 at 04:30 PM
  • Introduction to Microsoft Windows

    History of Windows Windows is the operating system sold by the Seattle-based company Microsoft. Microsoft, originally christened "Traf-O-Data" in 1972, was renamed "Micro-soft" in November 1975, then "Microsoft" on November 26, 1976. ... Read more

    Windows
    October 16, 2008 at 09:43 AM
  • Linux - The Vi editor

    Introduction to Vi Despite its very limited ergonomics, Vi i is one of the most popular text editors texte under Unix type systems (with Emacs and pico). Under Linux, there is a free version of Vi called Vim (Vi Improved). Vi (pronounced ... Read more

    Linux
    October 16, 2008 at 09:43 AM
  • OOP - Inheritance

    The concept of inheritance Inheritance is specific to object-oriented programming, where a new class is created from an existing class. Inheritance (often referred to as subclasses) comes from the fact that the subclass (the newly created ... Read more

    Object-Oriented Programming
    October 16, 2008 at 09:43 AM
  • Data transmission - Digital data transmission

    Introduction to digital transmission Digital transmission is the sending of information over a physical communications media in the form of digital signals. Analogue signals must therefore be digitised first before being transmitted. ... Read more

    Data transmission
    October 16, 2008 at 09:43 AM
  • Creating a local area network

    Why set up a local area network? When you have several computers, it can be convenient to connect them to each other to create a local area network (LAN). Setting up such a network costs very little, contrary to what people may think. Here ... Read more

    Network configuration
    October 16, 2008 at 09:43 AM
  • Data transmission - Cabling

    Cabling types Coaxial cable Transceiver: the connection between Thinnet and Thicknet Coaxial cable connectors Twisted pair cabling Unshielded Twisted Pair (UTP) Shielded Twisted Pair (STP) Twisted pair connectors Fibre optics Cabling types ... Read more

    Data transmission
    November 7, 2012 at 08:25 AM
  • Introduction to email

    What is email? Electronic mail (also known as email or e-mail) is one of the most commonly used services on the Internet, allowing people to send messages to one or more recipients. Email was invented by Ray Tomlinson in 1972. Why use ... Read more

    Email
    October 16, 2008 at 09:43 AM
  • Operating Systems - MS-DOS - Commands

    Command Description dir lists the contents of a folder cd changes folder cd .. parent folder md or mkdir creates a new folder deltree deletes a folder and all sub-folders copy, xcopy copies a file move moves a file del deletes a file type ... Read more

    MS Dos
    October 16, 2008 at 09:43 AM
  • Web- Introduction to the World Wide Web

    The "Web," short for "World Wide Web" (which gives us the acronym www), is the name for one of the ways that the internet lets people browse documents connected by hypertext links. The concept of the Web was perfected at CERN (Conseil ... Read more

    World Wide Web
    March 2, 2016 at 05:01 AM
  • Client / Contractor

    Contractor and Client Client The client refers to the entity that has the need that defines the project objective, schedule, and dedicated budget. The expected result of the project is the creation of a product, called works. The client is ... Read more

    Project management
    October 16, 2008 at 09:43 AM
  • Types of connectors

    5-pin DIN plugs A DIN (or DIN5) connector is a plug with 5 pins, formerly used to connect keyboards to computers: The DIN5 connector has been made obsolete by PS ... Read more

    Cables and connectors
    October 16, 2008 at 09:43 AM
  • Cables and connectors

    Connectors In information science, connectors, normally called "input-output connectors" (or I/O for short), are interfaces for linking devices by using cables. They generally have a male end with pins protruding from it. This plug is ... Read more

    Cables and connectors
    October 16, 2008 at 09:43 AM
  • Introduction to Spreadsheet Concepts

    What is a Spreadsheet? A spreadsheet (or spreadsheet program) is software that permits numerical data to be used and to perform automatic calculations on numbers contained in a table. It is also possible to automate complex calculations by ... Read more

    Spreadsheet
    October 16, 2008 at 09:43 AM
  • RTP/RTCP protocols

    Document written by Nico VanHaute, Julien Barascud and Jean-Roland Conca Introduction: What are RTP and RTCP? The spread of computers, added to the availability of cheap audio/video computer hardware, and the availability of higher ... Read more

    Internet (protocols)
    October 16, 2008 at 09:43 AM