TEM28 is the Ethernet convergence tributary board. Which of the following descriptions about the TEM28 board are correct? (Multiple Choice)

• A.The electrical signal can be output ODU0, ODU1flex, 00U1 or ODU2 signals to the backplane for cross scheduling through operations such as encapsulation mapping and OTN framing.
• B.RX1/TX1~RX4/TX4 ports are 10GE optical ports, which can handle 10GE LAN/10GE WAN services. Other interfaces are GE optical ports, GE electrical interfaces or FE electrical ports which can handle GE or FE services.
• C.The TEM28 board supports the L2 switch module and needs to configure the port to VCTRUNK service.
• D.TEM28 can simultaneously access FE, GE, 10GE LAN and 10GE WAN services through different ports.

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The maximum optical power of light-emitting OBU output is 20dBm, which is used in the C-band 80 system. How much dBm should the single-wave standard output optical power be?

• A.+1dBm
• B.+4dBm
• C.+7dBm
• D.-2dBm

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The maximum output optical power of an OBU board is 20 dBm, when it is used in a C-band 80-channel system, what is the standard per-channel output optical power?

• A.+ldBm
• B.+7dBm
• C.+4dBm
• D.-2dBm

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When the NNI port attribute is configured on the same subnet, the IP addresses of the ports on different links can be duplicated.

• A.FALSE
• B.TRUE

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When creating single station optical crossover, an error message "The direction of the cable is wrong selected" appears. The possible reason is?

• A.The network element management time is not synchronized.
• B."Create reverse crossover" is not selected during configuration
• C.Device physical fiber connection error
• D.Lack of logic fiber between boards

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