| 31. | A _________ sine wave is not useful in data communications; we need to send a _______ signal. |
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Answer: (b).single-frequency; composite
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| 32. | The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal. |
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Answer: (c).bandwidth
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| 33. | A(n)_________ signal is a composite analog signal with an infinite bandwidth. |
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Answer: (a).digital
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| 34. | Baseband transmission of a digital signal is possible only if we have a ____ channel. |
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Answer: (a).low-pass
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| 35. | If the available channel is a ____ channel, we cannot send a digital signal directly to the channel. |
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Answer: (b).bandpass
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| 36. | For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate. |
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Answer: (b).noiseless
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| 37. | For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate. |
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Answer: (a).noisy
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| 38. | _________ can impair a signal. |
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Answer: (d).All of the above
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| 39. | The _________ product defines the number of bits that can fill the link. |
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Answer: (c).bandwidth-delay
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| 40. | The portion of physical layer that interfaces with the media access control sublayer is called |
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Answer: (a).physical signalling sublayer
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