Helping Hand Questions for H31-311_V2.5

When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)

The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition; It can also output a processed clock and provide a clock source for other devices that need timing.

When performing fiber cut-off test on an ordinary MSP ring, which of the following alarms will be reported? (Multiple choice).

When the number of block errors detected by the B2 byte received at the recerve end is returned to the transmit end through the Ml byte, which of the following alarms or performance events are reported at the transmit end?