单选题What is the function of the AJB bits on DS1 using Extended Super Frame （ESF）？（）AIt is used for signaling on-hook and off-hook statusBIt carries CRC information for error detectionCIt is used for a control and performance informationDIt is used for a frame’s synchronization and alignment
单选题
What is the function of the AJB bits on DS1 using Extended Super Frame （ESF）？（）
A
It is used for signaling on-hook and off-hook status
B
It carries CRC information for error detection
C
It is used for a control and performance information
D
It is used for a frame’s synchronization and alignment
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