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单项选择题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

  • E

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