A printer translates signals from the computer into words and images on paper in black and white or color. Printer types include dot matrix, ink jet, laser, impact, fax, and pen and ink devices. Cables used to be collections of wires twined together to connect peripherals to the system unit. The modem connects a computer to a telephone line for communication with another remote computer or information network. Modems may be internal or external to the computer case.
Modems send and receive information at different speeds.
There are also cable television modems and DSL modems available in some areas that allow even greater transfer speeds. But, when examining the needs assessment or technology plan, it will probably become clear that for a school, it is more efficient to set up a network rather than rely solely upon modems. This is an input device that takes in an optical image and digitises it into an electronic image represented as binary data. Scanners are used to create computerised versions of a photo or illustration. For example, when a message comes from the Internet into a school, the router sends the information to the computer that is supposed to receive it.