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