| 71. | While there is (are) only _____ way(s) to send parallel data, there is (are) three subclass(es) of serial transmission. |
| a. | one; two |
| b. | two; three |
| c. | one; three |
| d. | none of the above |
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Answer: (c).one; three
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| 72. | In ______ transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte. |
| a. | synchronous |
| b. | asynchronous |
| c. | isochronous |
| d. | none of the above |
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Answer: (b).asynchronous
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| 73. | In _________ transmission, we send bits one after another without start or stop bits or gaps. It is the responsibility of the receiver to group the bits. |
| a. | synchronous |
| b. | asynchronous |
| c. | isochronous |
| d. | none of the above |
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Answer: (a).synchronous
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| 74. | The ________ mode provides synchronization for the entire stream of bits must. In other words, it guarantees that the data arrive at a fixed rate. |
| a. | synchronous |
| b. | asynchronous |
| c. | isochronous |
| d. | none of the above |
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Answer: (c).isochronous
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| 75. | A _________ digital signal includes timing information in the data being transmitted. |
| a. | self-synchronizing |
| b. | self-modulated |
| c. | self-transmitted |
| d. | none of the above |
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Answer: (a).self-synchronizing
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| 76. | In decoding a digital signal, the receiver calculates a running average of the received signal power, called the _______. |
| a. | baseline |
| b. | base |
| c. | line |
| d. | none of the above |
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Answer: (a).baseline
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| 77. | The ________ rate defines the number of data elements sent in 1s; the ______ rate is the number of signal elements sent in 1s. |
| a. | data; signal |
| b. | signal; data |
| c. | baud; bit |
| d. | none of the above |
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Answer: (a).data; signal
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| 78. | The signal rate is sometimes called the ____ rate. |
| a. | baud |
| b. | bit |
| c. | signal |
| d. | none of the above |
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Answer: (a).baud
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| 79. | The data rate is sometimes called the ___ rate. |
| a. | baud |
| b. | bit |
| c. | signal |
| d. | none of the above |
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Answer: (b).bit
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| 80. | In a _____ scheme, all the signal levels are on one side of the time axis, either above or below. |
| a. | polar |
| b. | bipolar |
| c. | unipolar |
| d. | all of the above |
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Answer: (c).unipolar
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