The MAC loopback and PHY loopback are used for fault location. When the MAC loopback is set to in loop, the PHY loopback can be set according to the actual situation.

• A.True
• B.False

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MSP is a network-level protection scheme. MSF does not directly protect services, and MSP switching and recovery are not affected even if there is no service on the MSP ring.

• A.True
• B.Error

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Which of the following is not the northbound interface provided by the U2000?

• A.SNMP
• B.XML
• C.CORBA
• D.ox

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When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.

• A.False
• B.True

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When the low-level resources of the device are insufficient, which of the following measures can be taken? (Multiple choice).

• A.Combine available low-level resources. (.)
• B.Use a crossover connection board with a large low-level cross-connection
• C.Configure the VC4 service. .
• D.Configure VC4 Server Path

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