Transmission mode of contemporary telegraph

Telegraph is a telecommunication method that uses wired electricity, radio, optics or other electromagnetic systems to transmit written information. The receiving office delivers the written materials to the recipient. Documents sent and copied in a telegraph communication system.

Telegraph communication can be point-to-point, but most of them are carried out in the telegraph communication network. In the public telegraph network, central offices at all levels perform telegraph exchange tasks.

Telegraph exchange adopts store-and-forward mode, that is, the message is received and stored (recorded on some medium) first, and then the stored message is sent to the next destination. This method is also called message exchange.

In addition to the public telegraph network, there are telex networks that serve specific users or users who join the network. It uses circuit switching, that is, the calling party and the called party are connected through the local office, so that they can be notified directly, so as to achieve the purpose of "dialogue". The emerging intelligent telex has opened up new data communication services, and its terminal is equipped with a microprocessor, which has the ability of word processing and data storage.