A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations.

What is teleprinter exchange?

Teleprinter switching system is used in Telex (teleprinter exchange) which is a convenient method of sending printed messages. An auto- telex service has the advantage of communication as in telephone astern and transfer of written record as in telegraph system.

How do Teletypewriters work?

A teletypewriter (TTY; also called a teletype or teleprinter) is a device that sends a typed message to another place. A teletypewriter has a typewriter keyboard, a local printer (so the user can see what has been typed) and a transmitter. Messages can be sent over wires or radio waves.