9.4 Data
Data can be transmitted in serial or parallel. A serial cable generally has fewer wires than an parallel cable. Serial transmission can be synchronous(all data needs to be sent at the same rate) or asynchronous(data has special start/stop bits and is faster)
The transmission mode can be simplex, half duplex or duplex.
Copy diagrams on page 180
Protocol is the rules for sending data between computers.
Error checking can be done with parity bits. An extra bit is sent with a 7-bit binary number. If it is even parity then there must be an even number of ones transmitted. If it is odd parity then an odd number of ones must be transmitted. Errors are not picked up if there is more than one error in a transmission.
Write out the sentence and fill in the missing word
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Serial
transmission requires data to be sent at the same rate is ?????. |
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Transmission mode
in both directions but not at the same time is ?????. |
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Transmits data one
bit at a time through a single channel or wire is ?????. |
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Set of rules governing
the transfer of data between computers is ?????. |
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Transmits a number
of data bits simultaneously through separate channels is ?????. |
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Transmission mode
in one direction only is ?????. |
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Serial
transmission that sends data by identifying each byte with special start and
stop bits is ?????. |
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Transmission mode
in both directions at the same time is ?????. |
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A measure of the
maximum number of data symbols or electrical signals that can be sent per
second over the communication link is ?????. |
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An additional bit
whose purpose is to check the accuracy of the received character is ?????. |