28. US cellular system: A. Provides half duplex services B. Provides fully duple
ID: 2249211 • Letter: 2
Question
28. US cellular system: A. Provides half duplex services B. Provides fully duplex services C. Provides both half and fully duplex services D. Provides neither half duplex nor fully duplex services E. None of the above is true. 29. Which of the following is true about the hand-off sequence (with reference to cellular telephony): A. It is a series of operations that a central office (CO) performs to initiate a cell B. It is a series of operations that a mobile telephone switching office (MTSO) performs to initiate a cellular ular users call. user's call. C. It is a series of operations that a MTSO performs to terminate a cellular user's call. D. It is a series of operations that a CO performs to terminate a cellular users call. E. None of the above is true. 30. In US cellular system the channel bandwidth is (wideband FM): A. 30 Hz B. 300 Hz C 3000Haz D. 30000 Hz E. None of the above is true. 31. If the transmission band is 869-880 MHz and the channel bandwidth of the narrow-band FM is 11 MHz. How can we use? A. I B. 10 C. 100 D. 1000 E. None of the above is true. 32. If the transmission band is 820-895 MHz and the channel bandwidth of the wide-band FM is 30 kHz. How many channels can we use? A. B. 2 C. 2000 D. 2500 E. None of the above is true.
Explanation / Answer
Answer:-28) Option B is correct. Cellular systems are always full duplex, full duplex means both sender and receiver can send and receive data/voice at the same time. In half duplex any one can send at a time and other can receive only.
29) Option E is correct. Hand-off is a process of transfering an active call or data from one cell in cellular network to other. It's not about starting and terminating the call, it's for on going or active call/data.
30) NEED TO SEARCH.
31) Option A is correct. Band available is 880-869 = 11 MHz, channel length = 11 MHz, so number of channels = 11/11 = 1.
32) Option D is correct. Band available is 895-820 = 75 MHz = 75000 kHz, channel length = 30 kHz, so number of channels = 75000/30 = 2500.
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