For inter-board wavelength protection and client-side 1+1 wavelength protection, it is forbidden to manually set the "laser status" of the backup OTU client-side optical interface to "on", otherwise the service will be interrupted.

• A.FALSE
• B.TRUE

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The LPT (Link Pass Through) function is used in scenarios where WDM equipment accesses FE/GE/10GE LAN services. The correct statement about LPT is: (multiple choice)

• A.It enables the user equipment to perceive the link status information by turning off and turning on the laser of the wavelength division device, thereby triggering the user equipment to activate the business protection function, and select the main or backup link for communication
• B.From the network level, ALS is similar to the Link Pass Through (Link Pass Through) function. The difference is mainly reflected in the applicable services, fault transmission methods and laser restart mechanism.
• C.By adding overhead bytes supporting the LPT protocol to the WDM side signal frame format, the operating status of the network access point or service network can be monitored.
• D.The implementation of the LPT function can be divided into port-based LPT and service-based LPT.

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When the OTN equipment is connected to the Cisco equipment, the amount of CRC error packets on the Cisco equipment interface is relatively large. The impossible reasons are:

• A.Abnormal docking optical power
• B.The amount of error on the line side of the OTN equipment is large
• C.The docking optical module is faulty
• D.The type of the docking optical module is wrong

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During the equipment installation process, the following statement is wrong:

• A.Inside the cabinet, the binding interval of optical fiber cable ties/optical fiber ties should not exceed 250mm, and the binding interval of user cable ties should not exceed 200mm
• B.Wear anti-static gloves or anti-static wrist straps before touching the equipment, holding boards, veneers, IC chips, etc.
• C.When plugging and unplugging a board with a connecting cable or pigtail on the panel, you should first unplug the connecting cable or pigtail before plugging and unplugging
• D.In order to dissipate heat, the empty slots on the network element can be used without filler panels

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During the network acceptance test, it was found that the OSN 3500 can work normally when connected to an external clock source. When the external clock source is disconnected, it enters the hold state, but the hold state cannot last for 24 hours. Please explain the possible reasons.

• A.Wrong clock level setting
• B.The clock SSM function is not enabled
• C.Access to external high-precision clock source time is too short
• D.The clock crystal oscillator fails, and the board needs to be replaced

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