Pressing a letter on one teletype keyboard would cause a signal to be sent, over telegraph wires, to a teletype machine on the other end, which would then electromechanically type that letter.

在一个电传打字机键盘上按下一个字母会导致信号通过电报线发送到另一端的电传打字机，然后电传打字机将以机电方式打出该字母。