Design For Accessibility: Getting it right from the start
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Data communication
1.
2. Data Communications
Data communication is the exchange of data between two devices via
some form of transmission medium (wire cable).
face to face over distance
7. Medium: The physical path by which a message
travels from sender to receiver
â twisted pair, coaxial cable, fiber-optic, radio
waves
Components
Medium
8. Protocol: a set of rules that govern data communications
â An agreement between the communicating devices
â Devices may be connected but not communicating (no
protocol)
â Arabic speaker with Japanese speaker
Components
Protocol
10. Data Flow
Simplex
The communication is unidirectionalThe communication is unidirectional.
Only one device on a link can transmit; the other can only receive