The following description of the cross-board of the OSN 8800 T64 subrack. Which is correct? (Multiple choice)

• A.Enhanced subrack can only be configured with UXCT+USXM or UXCT+USXH
• B.XCT+SXM can support ODU0, 1, 2, and 3 levels of crossover.
• C.XCT+SXM can be regarded as a whole when working. If any faulty, the two boards will be switched together.
• D.XCT+SXM can be used together to provide an ODUK crossover with a total capacity of 2.56 Tbit/s.

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The OTN circuit board (such as ND2) of OSN 1800V can respond to the status of the indicator light on the panel to reflect the optical power of the local end too high or too low.

• A.FALSE
• B.TRUE

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For an MSTP device, the service layer path is a path existing on the network management side, and the client layer path is a path existing on the network element side.

• A.TRUE
• B.FALSE

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Which of the following is not a precaution after board replacement?

• A.Check the indicator blinking status of the board and ensure that the board works properly.
• B.Ensure that no abnormal alarm.
• C./For functional units that have backups, check whether the switchover is normal.
• D.Record the settings of jumpers and DIP switches on the board.

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The E&M signal defines the type of connection between a relay device and a signaling unit. Which of the following belongs to the relay device?

• A.Telecommunications Exchange
• B.Softswitch platform
• C.PBX
• D.E&M voice exchange

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