Introduction
Telecommunication concepts has develop from one condition where the sign methods, to use the drum and semaphore for long distance communication to condition is where used it electric signal, radio, and electric-optics for the mentioned. Optical signal is produced from laser source and transmitted via fiber optic media. Telecommunication network is useful to carry a signal between terminal according to geographic to be somewhere far from each other.
In this case, a terminal can be in the form telephone set, PC, facsimile, terminal data, etc. Millions of terminal around the word at this time is installed within international network and operate on information transfer process, which formed such as telephone conversation or file transfer between two computers or message source between two terminal, etc. In telephone conversation, terminal that does calling initiation is called as customer that call (caller) and terminal destination is called as customer that called. In this transfer information, terminal communicated each other severally is called as source and destination.
Maximum potency from telecommunication system will be fulfilled only if one terminal from one side of earth can communicate with other terminals that reside in another side of earth. Modern communications network tries to develop a universal connection idea be a fact. In this case, connectivity in telecommunications network is achieved by using switching system, with terrestrial transmission system or satellite.
