Business data networks and telecommunications pdf

If you are not required to use this edition for a course, you may want to check it out. In the early days of computing, computers were seen as devices for making calculations, storing data, and automating business processes. However, as the devices evolved, it became apparent that many of the functions of telecommunications could be integrated into the computer. During the s, many organizations began combining their once-separate telecommunications and information-systems departments into an information technology, or IT, department. This ability for computers to communicate with one another and, maybe more importantly, to facilitate communication between individuals and groups, has been an important factor in the growth of computing over the past several decades.

Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire , radio , optical or other electromagnetic systems. It is transmitted through a transmission media , such as over physical media, for example, over electrical cable , or via electromagnetic radiation through space such as radio or light. Since the Latin term communicatio is considered the social process of information exchange, the term telecommunications is often used in its plural form because it involves many different technologies. Early means of communicating over a distance included visual signals, such as beacons , smoke signals , semaphore telegraphs , signal flags and optical heliographs. A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi , who won the Nobel Prize in Physics in , and other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. It comes from Old French comunicacion 14c.