The clock unit can access an external clock source as the timing signal source of the system only through the external clock interface. In addition, it can output the processed clock and provide the clock source for other devices that require timing.
Answer(s): B
Which of the following is the multiplexing mode of SDH?
Answer(s): D
Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?
The frame structure of 0DU4 is four times that of ODU1.
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