Which of the following descriptions about the TMB1AST2 board is correct? (Multiple choice)

• A.When used with the DSFIU01/DSFIU02 board, the TM1/RM1 optical port needs to be configured with a 1511 mm wavelength optical module, and the TM2/RM2 optical port needs to be configured with a 1491 rm wavelength optical module.
• B.TMB1AST2 board supports IEEE 1588v2 clock processing function and OTDR function.
• C.When used with the DFIU03/DFIU04 single board, the OSC optical port needs to be equipped with an optical module with a wavelength of 1511 rm.
• D.TM1 optical port must be connected with TMI1 optical port.

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Which of the following statements about the alarm reversal function is wrong?

• A.After the alarm of the port device is reversed, no alarm will be reported when there is an actual alarm, and an alarm will be reported when there is no actual alarm.
• B.By default, it is the non-reversal mode. In this mode, the alarm of the device port cannot be reversed.
• C.For ports that have not opened services, alarm reversal is used to avoid related alarms
• D.In the automatic recovery mode, regardless of whether there is an alarm on the port, the alarm of the port device can be reversed

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On an OTN network, a large number of bit errors occurred on multiple waves. The 0TU board reports alarms such as OTUk EXC, OTUK_DEG, BEFFEC_DEC, B1_EXC, and B1_SD. What is the reason for the impossibility?

• A.The AST2 board is faulty
• B.The ambient temperature is too high
• C.The pigtail loss of the multiplexing part is too large
• D.DCM module configuration is unreasonable

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The transmitting light source in the integrated DWDM system must strictly abide by the G.693 optical port specification.

• A.True
• B.False

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TEM28 is an Ethernet aggregation tributary board. Which of the following descriptions about the TEM28 single board are correct? (Multiple choice)

• A.The electrical signal can output ODUO, ODU1flex, 00U1 or ODU2 signals after encapsulation and mapping processing, OTN framing and other operations and send them to the backplane for cross-connect scheduling.
• B.RX1/TX1~RX4/TX4 ports are 10GE optical ports, which can handle 10GE LAN/10GE WAN services, and other ports are GE optical ports, GE electrical ports or FE electrical ports, which can handle GE or FE services.
• C.TEM28 can simultaneously access FE, GE, 10GE LAN and 10GE WAN services through different ports
• D.The TEM28 board supports the L2 switching module, and the Port to VCTRUNK service needs to be configured

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