Which of the following are components that reuse N wavelengths in WDM system? (Multiple choices)

• A.Optical repeater unit
• B.WDM unit
• C.Supervision unit
• D.Optical amplifier unit

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The following description of the alarm, which is correct? (Multiple choice)

• A.OTUK-TIM: The OTUK trace identifier is the TTI (Trail Trace Identifier) mismatch. This alarm is generated if the trace identifiers of the peer end and the local end do not match and the TIM detection is enabled during the control process. Compare the API (Access Point Identifiers) in the input signal with the desired API.
• B.OTUk-LOM: Multi-frame alignment signal abnormal alarm, multi-frame positioning processing continues the multi-frame out-of-synchronization (o0M) state for 3ms, generating OTUelom alarm.
• C.OTUKBDI: OTUk backwards indication alarm. When the signal detected by the SM segment fails, the value of the BDI byte is 1, and the alarm is reported.
• D.OTUKAIS: OTUK alarm indication signal, the AIS signal is transmitted downstream, indicating that the upstream detected signal is invalid.

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Which of the following boards can be inserted on the OSN 9800 U64 subrack?

• A.TNV1N401
• B.TN18LSC
• C.TN54GS4
• D.TNF 5UNQ2

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The OSN 1800V supports the following packet protection features:

• A.PW APS
• B.Tunnel APS
• C.LAG
• D.TPS

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The optical monitoring channel wavelength used by the ST2 board is: (Multiple choice)

• A.1510nm
• B.1511nm
• C.1471nm
• D.1491nm

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