单选题UPSR protection switching is initiated by （）, while BLSR is initiated by （）.Athe K1 SONET byte； the K2 SONET byteBthe K2 SONET byte；the K1 SONET byteCtransmitter switching；receiver detectionDLine Overhead bytes；Path Overhead bytesEPath Overhead bytes；Line Overhead bytes
单选题
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
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