Common causes for abnormal OSNR scanning results of the MCA board after the OD function is enabled

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1. The fiber type and length of the FIU board are not set.
2. The optical performance monitoring function is not enabled for the MCA board.
3. The OMS trail is incomplete. When the OD function is enabled, ensure that the OMS trail is complete. If a logical fiber connection is deleted from the OMS trail after the OD function is enabled, the OD function will become abnormal. As a result, no OSNR is displayed for the MCA board. In this scenario, the logical fiber connection must be added again, the OMS trail must be searched out, and the OD function must be enabled.
4. The logical fiber connection of the MON port on the MCA board is falsely deleted.
5. The NE where the MCA board resides and the OTM site are not in the same ECC subnet.
6. The MCA board is in an early version. TN11MCA401 and TN11MCA801 do not support the OD function, and TN11MCA402 and TN11MCA802 also have requirements on the module firmware. If the firmware versions for the TN11MCA402 and TN11MCA802 boards are earlier than the earliest version supported, the firmware on these boards cannot be upgraded. You need to replace the TN11MCA402 and TN11MCA802 boards before using the OD function. You can run the :cfg-get-modverinfo:Bid command to query the module version.

Other related questions:
Wavelength scanning results of MCA boards on BWS 1600G
Generally, the SNR AFEC is around 15. If center wavelength deviation is detected, an alarm is generated.

Principle for the MCA board to implement optical spectrum scanning
The MON port of a monitored board outputs weak optical power through an optical splitter. After being connected to the MON port of the board, the MCA board performs appropriate compensation so that the MON port output power of the monitored board is close to the actual optical power output by the OUT port of the monitored board.

Common issues about the OD system
Question: For the first version of OD on NG WDM V100R007C00 (matching U2000 V100R006C02): 1. What are the differences in OPM/MCA performance reporting? 2. Why must the fiber connections be correct before the OD works? 3. How long does it take before the OSNR can be queried after the OD feature is configured for the first time or the NE is reset? 4. The OD function is forcibly enabled for a network that does not support the OD function, causing the MCA/OPM8 function to be abnormal and the original function unavailable. How to solve this problem? 5. Where can the length and type of optical fibers be configured? From the interface for creating logical fiber connections on the U2000 or other navigation paths? Analysis: Answer: 1. When the OSNR detection fails, the OSNR in the OPM is an invalid value. The MCA OSNR performance value is compatible with the existing MCA board and is reported as ?600. 2. When the OD feature is started for the first time, or the network changes (such as dimension adjustment or dimension expansion), the OD connection relationship needs to be synchronized to the equipment through the NMS interface (OTU-MUX/DMUX does not need to be changed.) 3. 10 minutes. 4. You can run a Navigator command to resolve the problem. :emca-check-section-id:0, 0&0 5. The navigation path is on the Board Port-Advanced Attributes tab page. Notes: 1. The line-side fiber type and length configured on the FIU, DAS1, or RAU board at the receive end must be consistent with those of actual fibers. 2. If there is no RAU board at the receive end, configure the fiber type and length information on the FIU or DAS1 board. If there is RAU board at the receive end, configure the information on this RAU board.

Possible causes of an OSNR decrease
The possible causes are as follows: Possible cause 1: Any fiber pigtail in a multiplexing part or the optical cable degrades or is physically damaged. As a result, the attenuation of the fiber increases, and the receive optical power decline causes an OSNR decrease. Possible cause 2: The OA board gain at the local or peer site is decreased.

MCA functions
The MCA board is an optical spectrum analyzer board that is used to analyze the optical spectrum of optical signals. The MCA board analyzes the optical spectrum of the input optical signals, and transmits the analyzed and converted data to the control and communication module through the data interface. The control and communication module then reports the data to the SCC board and the NMS. The NMS then displays the final spectrum analysis results.

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