6个速率为64Kb/s的用户按照统计时分多路复用技术(STDM)复用到一条干线上、若每个用户平均效率为80%，干线开销4%，则干线速率为（）Kb/s。
- A.160
- B.307.2
- C.320
- D.400
正确答案及解析
正确答案
解析
假设干线速率为a，则有6×64Kb/s×80%=（1-4%）×a，解方程得a=320Kb/s。
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