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Commonly used for international communications, telex (telegraph exchange system) consists of a teletypewriter terminal to translate and interpret messages into code; special telegraph circuits designed to carry the code; and a teleprinter to print the communication.
Each subscriber is individually issued his or her own telex line and number that a caller dials to send messages that are keyed into the teletypewriter terminal. The message is then transmitted to the receiver’s automatic teleprinter. For international telex communications, satellite channels or transoceanic submarine cables are used.