Which ISDN device converts the four-wire BRI signals from an S/T interface into two-wire signals of a U interface?（）
- A、TE1
- B、NT-2
- C、TA
- D、TE2
- E、NT-1
正确答案:E
答案解析:有
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Which ISDN device converts the four-wire BRI signals from an S/T interface into two-wire signals of a U interface?（）
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