A, C are the WDM OTM stations, and B is the relay station.
When the transmission direction of the A to B stations is interrupted, the Wavelength side of the B-stack OTU relay board reports the R_LOS emergency alarm and runs the processing to the upstream A.
The station side OTU2_BDI secondary alarm. At the same time, the alarm continues to be transmitted to the downstream station of the B station. After the alarm is processed at the C site, the ODU2_PM_AIS minor alarm is reported on the WDM side of the C-site OTU, and the ODU2_PM_BDI secondary alarm is transmitted back to the upstream station A.

• A.FALSE
• B.TRUE

Comment: *

Name: *

Email: *

Verification: *

Which of the following description of the performance parameters of line fiber quality monitoring is wrong?

• A.The total loss of the fiber will affect the actual detection distance. The dynamic range of the same detection mode is fixed. The larger the total loss of the fiber, the smaller the distance that can be detected.
• B.Line fiber quality monitoring function increases the monitoring accuracy by adding the averaged results to the average. The actual time required from the start detection to the software returning the test result will be greater than the "detection time" is set.
• C.Different modes of light pulse width are different in detection, pulse width affects distance accuracy and monitoring distance. The larger the pulse width, the larger the dynamic range, the longer the test distance and the higher the range measurement accuracy.
• D.Increasing the pulse width increases the duration of the laser emission, which increases the energy injected, allowing for a larger dynamic range, but an increase in pulse width results in a larger dead zone.

Comment: *

Name: *

Email: *

Verification: *

For the wavelength division system, configure the 1st-20th wave, use the NS4 single board, and test the M40 output port with the spectrum analyzer during the commissioning. It is found that the optical power of the 20th wave is significantly lower than the other 19 waves. The possible reasons are as follows: (Multiple Choice)

• A.The 20th channel corresponding to the M40V has a large insertion loss.
• B.The 20th wave OTU center is long drifted
• C.The 20th wave OTU wave side light is too small
• D.The 20th wave OTU's RX port is incorrectly added with 5dB fixed light decay.

Comment: *

Name: *

Email: *

Verification: *

When the cross-board is configured with 1+1 hot backup, in the case of normal switching, the replacement of the cross-clock board does not affect the packet service.

• A.TRUE
• B.FALSE

Comment: *

Name: *

Email: *

Verification: *

The service types supported by the PND2 board used by the OSN 8800 are: (Multiple choice)

• A.EPL
• B.VPWS
• C.EPLAN
• D.VPLS

Comment: *

Name: *

Email: *

Verification: *