单项选择题
What is the point of using a combiner? （）
A. Up to four sites can share one PCM link.
B. Several TRXs can share one antenna system.
C. The mobile can listen to two base stations at the same time.
D. Only one base station is needed per site.
E. Sending and transmitting can be performed from the same antenna.
相关考题
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单项选择题
Which of the following is not necessary to consider when surveying a potential site? （）
A. Space for antennas
B. Frequency allocation
C. Electrical power availability
D. Permission/Contract with owner
E. Availability of PCM link to the BSC -
单项选择题
A subscriber makes a two-minute call and a four-minute call during the busy hour. How much traffic does he generate for that hour? （）
A.33 millierlangs
B.66 millierlangs
C.100 millierlangs
D.10 millierlangs
E.25millierlangs -
单项选择题
Reusing frequencies in a cellular pattern (compared to “one big cell”)（）
A. Increases channel utilization, cost ,and interference.
B. Increases capacity and cost, but decreases interference.
C. Increases capacity, but decreases cost and interference.
D. Increases capacity, cost, and interference.
