Local network

Connecting two computers that contain a modern card is straightforward as shown in the diagram. The setup makes dialling a telephone number superfluous: normally, simple Hayes commands such as ATA and ATO are sufficient to effect the connection. Since the modem cards are active, that is, they impose a strong analogue signal on to the line, it is not necessary for a direct voltage to be put on to the line. All signals needed for the communicatron are generared by the modem cards.