Chapter 1 Lecture Presentation
... Communications Approaches to long-distance communications Courier: physical transport of the message ...
... Communications Approaches to long-distance communications Courier: physical transport of the message ...
Lecture_2012_1
... Internet transfer of individual block of information Internet reliable transfer of a stream of bytes Real-time transfer of a voice signal E-mail & web build on reliable stream service Fax and modems build on basic telephone service ...
... Internet transfer of individual block of information Internet reliable transfer of a stream of bytes Real-time transfer of a voice signal E-mail & web build on reliable stream service Fax and modems build on basic telephone service ...
Telecommunication
... with series of satellites Orbit 35,880km above the earth Powered by solar energy Use micro wave for transmission can relay up to 33,000 calls simultaneously as well as several television channels. ...
... with series of satellites Orbit 35,880km above the earth Powered by solar energy Use micro wave for transmission can relay up to 33,000 calls simultaneously as well as several television channels. ...
COMMUNICATION - Free File Uploader
... in New York begins a program of regular radio broadcasts, consisting entirely of gramophone music At a rate of fifteen cents per word, the public can send messages across the Atlantic. This is made possible by the first transatlantic radio-telegraph stations, based in Glace Bay, Canada and Clifden, ...
... in New York begins a program of regular radio broadcasts, consisting entirely of gramophone music At a rate of fifteen cents per word, the public can send messages across the Atlantic. This is made possible by the first transatlantic radio-telegraph stations, based in Glace Bay, Canada and Clifden, ...
Computer networks and the Internet
... In earlier times, telecommunications involved the use of visual signals, such as smoke, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded drumbeats, lung-blown horns, or sent by loud whistles, for example. In the modern age of electricity and electronics, telec ...
... In earlier times, telecommunications involved the use of visual signals, such as smoke, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded drumbeats, lung-blown horns, or sent by loud whistles, for example. In the modern age of electricity and electronics, telec ...
Telegraphy
Telegraphy (from Greek: τῆλε tele, ""at a distance"" and γράφειν graphein, ""to write"") is the long-distance transmission of textual/symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Such methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples. In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 1900s brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging.