On an ONS 15454 node you can tunnel an （）.
- A、SDH circuit over a SONET network delivering it as an SDH signal
- B、SDH circuit over a SONET network delivering it as a SONET signal
- C、SONET circuit over an SDH network delivering it as an SDH signal
- D、SONET circuit over an SDH network delivering it as a SONET signal
正确答案:A
答案解析:有
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