When do we use a modem?

Computers that are connected to a telephone line incorporate a device called a modem. It turns signals into a form that can be transmitted along the telephone line. The name ‘modem’ comes from the term Modulator-Demodulator. The device modulates, or changes, the digital signal from a computer into an analogue signal, which is the type of signal that travels along telephone lines. The modem decodes, or demodulates, the signals it receives back so they can be read by the computer. Some modems are ‘voiceband’; that means they enable digital terminal equipment to communicate over telephone channels, which are designed around the narrow bandwidth requirements of the human voice.

Fact File

Robots are machines that ‘think’ with a computer brain which tells them what to do. A factory robot is often just a moving arm.


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