In the frequency planning of a certain place, in addition to the main BCCH frequency point, a 6M frequency band is allocated for TCH, and 1×3 frequency hopping is adopted. In order to ensure that the same adjacent frequency collision does not occur in the same base station, what is the maximum station configuration?

In the frequency planning of a certain place, in addition to the main BCCH frequency point, a 6M frequency band is allocated for TCH, and 1×3 frequency hopping is adopted. In order to ensure that the same adjacent frequency collision does not occur in the same base station, what is the maximum station configuration?
A . S444
B. S555
C. S666
D. S777

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Answer: C