A network element cannot join the smart domain after the smart feature is enabled. The possible reasons are: (multiple choice)

• A.The smart domain is not refreshed;
• B.N board DCC management RES_ODU channel status is not enabled;
• C.The electrical layer DCC is not surging;
• D.The network element data is not uploaded;
• E.ODU1_PM_AIS exists on the N board;

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Among the following methods, which is the effective way to avoid discrete business? (multiple choice)

• A.For cross-network management services, landing through virtual network elements
• B.For services that use the command line or the network management for single-site SDH service configuration, the path search must be performed on the network management to ensure that the service configuration is complete and standardized
• C.Paths with protected routes should be tested for switching to verify that the configuration is complete and standardized
• D.Circuit scheduling is created and configured using network management end-to-end path management

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A certain network is configured with SOM. When performing path performance analysis, the OSNR value of the downstream optical amplifier of the OCh path is higher than that of the upstream optical amplifier. What is the error of the following analysis ()?

• A.Click "Analyze" on the "Path Performance Analysis" interface to restart the performance analysis to solve the problem
• B.The network management must issue the SOM routing configuration to the OMS segment on the path in order from the front to the back. It takes about a few seconds to issue the SOM routing configuration for each OMS segment, and it takes a few seconds to configure the SOM routing existence time between each OMS segment. difference
• C.The calculation of the OSNR value of the first part of the OMS section where the OCH path is located is completed, and the calculation of the latter part has not been started. At this time, the performance analysis is started, and the new calculated value of the front part is reduced due to external reasons. This phenomenon will occur
• D.After the initial configuration of the SOM route is issued, the performance analysis is started immediately. If the SOM route is configured first in the OMS section at this time, the OSNR calculation is started first, and there is no basis for the previous OSNR calculation value, this phenomenon will occur

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In the point-to-point WDM networking scenario, the signal-to-noise ratio of a certain single wave is low, and the other channels are normal. The reason is that it is impossible?

• A.The gain slope of the amplifier changes
• B.The attenuation of the pigtail from the OTU board corresponding to this wave to the multiplexer increases
• C.Increased attenuation on the light path
• D.The transmit optical power of the OTU board corresponding to this wave has decreased

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In microwave products, which of the following protection methods can enable reverse switching? (multiple choice)

• A.1+1 SD
• B.1+1 FD
• C.N+1 protection
• D.1+1 HSB

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