During the network acceptance test, it is found that the OSN 3500 can work normally when the external clock source is connected, and enters the hold state when the external clock source is disconnected, but the hold state cannot last for 24 hours. Which of the following are possible reasons?

During the network acceptance test, it is found that the OSN 3500 can work normally when the external clock source is connected, and enters the hold state when the external clock source is disconnected, but the hold state cannot last for 24 hours. Which of the following are possible reasons?
A . The time to connect to an external high-precision clock source is too short
B. Clock SSM function is not enabled
C. Wrong clock level setting
D. The clock crystal oscillator fails, and the board needs to be replaced

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Answer: A