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week 1: Introduction to Data Communication, standard organizations, data…
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data flow
simplex
unidirectional / one way
either one will transmit, another one will receive
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half-duplex
both devices can transmit and receive, but not at the same time
tranmission mode
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serial
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asynchronous
required stop bit (1) at the end , start bit (0) at the beginning of each byte
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data - concepts and instruction presented in whatever form agreed upon by the parties creating and using the data.
hardware - computer, Switch, Hub, Router etc.
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software - Ms Outlook, Web Browser, Yahoo Messenger etc
the data to be communicated; text, numbers, pictures, sound video, etc or combination.
the device that sends the message; computer, workstation, telephone handset, video camera, etc
teh physical path for the transmission; copper wire, fiber-optic cable, laser, radio waves etc
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dicrete, represented y bit patterns (1/0)
discrete, represented by bit patterns, composed of a matrix of pixels
continues, recording / broadcasting
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