It is the telecommunication service in written form that the subscribers make with the subscribers in the country or abroad by means of telephone network, telex exchanges and telegram channels and telex devices. It is an international phrase which is originated from combination of the first syllables of English words “Teleprinter Exchange”.
It is the operation of sending prepared message to telex and teletex subscribers in the country and abroad over teletex network. These texts are prepared earlier with teletex machines with displays, they can be stored, corrections and arrangements can be done and they are programmed and transmitted at the desired time.