一个T1基本帧的传送时间为（在此空作答），每个子信道的基本速率为（）。
- A.100ms
- B.200μs
- C.125μs
- D.150μs
正确答案及解析
正确答案
解析
T1。T1系统共有24个语音话路，每个时隙传送8bit（7bit编码加上1bit信令），因此共用193bit（192bit加上1bit帧同步位）。每秒传送8000个帧，因此PCM一次群T1的数据率=8000×193b/s＝1.544Mb/s，其中每个话音信道的数据速率是64kb/s。
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