Which of the following WAN technologies modulates 24 channels into a 1 5Mbps signal?（）
- A、ISDN
- B、PSTN
- C、OC-2
- D、T1
正确答案:D
答案解析:有
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CompTIA认证考试
CompTIA认证考试
Which of the following WAN technologies modulates 24 channels into a 1 5Mbps signal?（）
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