November 2012
Intermediate to advanced
1034 pages
53h 38m
English
The word ‘telecommunication’ is derived from two Greek words, which can be translated as ‘the passage of information at a distance’. Historically the only means of communication available were visual communications, e.g. beacons, smoke signals and semaphore signalling. Modern telecommunications networks enable different types of data to be passed: Voice (by telephony), Paper images (by facsimile), Computer systems (by using digital data networks), Plain text (by telex), Formatted Text (by electronic mail and related systems) and Video Systems (by Integrated Services Digital Network – ISDN). The different forms of telecommunication are distinguished ...
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