题目内容
(请给出正确答案)
[主观题]
Which of the following are correct principles for selecting sync clock source for PTN
devices?()
A.If a clock source has an alarm sign, it will not join the selection.
B.Select clock source with highest quality level
C.if clocks have the same quality level, then select the one that traverses the minimum number of clock sources
D.If the clocks share the same quality level, traverse the same number of NEs and have no line alarm signs, then anyone of the clocks is OK.
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