During the network acceptance test, it was found that the OSN 3500 can work normally when connected to an external clock source. When the external clock source is disconnected, it enters the hold state, but the hold state cannot last for 24 hours. Please explain the possible reasons.

For WDM network, the following description is correct (multiple choice)

After the single main control is replaced with the main control, the new main control is inconsistent with the previous failed main control software, which alarm may be reported by the network element

What are the main application scenarios of 1588 ACR? (multiple choice)

Because the Ethernet port OAM acts on the last kilometer and is used for the Ethernet link between two devices, the protocol stipulates that the message cannot be forwarded by the bridge.