UPSR protection switching is initiated by （）, while BLSR is initiated by （）.
- A、the K1 SONET byte； the K2 SONET byte
- B、the K2 SONET byte；the K1 SONET byte
- C、transmitter switching；receiver detection
- D、Line Overhead bytes；Path Overhead bytes
- E、Path Overhead bytes；Line Overhead bytes
正确答案:E
答案解析:有
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