How to test 1+1 Protection of the Cross-Connect Board and Clock Board for OptiX OSN 8800?

1+1 protection is configured by using the cross-connect board and clock board. This section describes how to test the 1+1 protection switching of the cross-connect board and clock board, thus ensuring that the protection switching is normal.

Prerequisites

For the OptiX OSN 8800 T16, slots 9 and 10 must house the high cross-connection, system control and clock processing board.

For the OptiX OSN 8800 T32, slots 9 and 10 must house the cross-connect board.

For the OptiX OSN 8800 T64, slots 9 and 43 (or slots 10 and 44) must house the cross-connect board.

For the OptiX OSN 8800 T32, slots 42 and 44 must house the clock board.

For the OptiX OSN 8800 T64, slots 75 and 86 must house the clock board.

The NE commissioning data must be configured.

Tools, Equipment, and Materials

NMS

Procedure

1. Double click the ONE icon on the Physical Map, and the NE Panel tab is displayed.
2. Right-click the NE icon and choose NE Explorer.
3. Choose Configuration > Board 1+1 Configuration. Click Query. The queried Active Board should be the same as the Working Board.
   
   

   For the OptiX OSN 8800 T16, Working Board is the cross-connection, system control and clock processing board in slot 9, and Protection Board is the cross-connection, system control and clock processing board in slot 10. Active Board is the cross-connection, system control and clock processing board that is actually working.

   For the OptiX OSN 8800 T32, Working Board is the cross-connect board in slot 9, and Protection Board is the cross-connect board in slot 10.Active Board is the cross-connect board that is actually working.

   For the OptiX OSN 8800 T64, Working Board is the cross-connect board in slot 9 or 10, and Protection Board is the cross-connect board in slot 43 or 44. Active Board is the cross-connect board that is actually working.

   For the OptiX OSN 8800 T32, Working Board is the clock board in slot 42, and Protection Board is the clock board in slot 44. Active Board is the clock board that is actually working.

   For OptiX OSN 8800 T64, Working Board is the clock board in slot 75, and Protection Board is the clock board in slot 86. Active Board is the clock board that is actually working.

4. Select Cross-Connect Board 1+1 Protection or Clock 1+1 Protection, and then click Working/Protection Switching. In the Microsoft Internet Explorer dialog box that is displayed, click OK. In the Operation Result dialog box that is displayed, click Close.

   When you select the cross-connect board or the clock board for switching, the cross-connect board and the clock board perform switching at the same time.

5. Repeat step 3 to perform the query. The queried Active Board should be the same as the Protection Board.
6. Select Cross-Connect Board 1+1 Protection or Clock 1+1 Protection, and then click Restore Working/Protection. In the Confirm dialog box that is displayed, click OK. In the Operation Result dialog box that is displayed, click Close.

   When you select the cross-connect board or the clock board for switching, the cross-connect board and the clock board perform switching at the same time.

   The 1+1 protection switching on the cross-connect boards and clock boards is non-revertive. When Protection Board becomes Active Board, restore the cross-connect boards and clock boards to the original working/protection state by removing the protection board, or by clicking Restore Working/Protection on the NMS.

7. Repeat step 3 to perform the query. The queried Active Board should be the same as Working Board.

How to deal with Abnormal Switching of SNCP service on ONT line board NS4 of Huawei OSN8800?

This is a case about handling abnormal switching of SNCP service on ONT line board NS4 of Huawei OSN8800.

Problem Description

100G line board TN54NS4 of a customer is configured with SNCP services. It is reported that multiple abnormal switching occurs on the live network, no fiber cut occurs on the optical cable, and the optical power is normal. Therefore, the root cause analysis needs to be performed.

The networking is as follows:

Alarm information:

ODU_SNCP_PS

Handling Procedure

1. Query the NMS alarms. It is found that the ODU_SNCP_PS alarm occurs multiple times and the SNCP switching occurs.

2. Check the current and historical alarms of the device. It is found that no fiber cut alarm is generated.

3. Continue to check the receive optical power of TN54NS4. It is found that the receive optical power is stable. Therefore, the switching is not caused by the bit errors caused by the power jitter.

4. According to the networking analysis (as shown in the following figure), it is found that SNCP switching occurs at a certain time, and services are switched from SNCP-to SNCP-protection. The switching cause may be caused by bit errors on the line. Because there is only one span between A-B, it can be confirmed that the problem is caused by this span.

5. The customer performed an OTDR test on the optical cable between the site A and the site B. It was found that the problem was caused by the reflection point of the optical cable.

6. The reflection point has a hop contact. After the connector is cleaned, the OTDR test shows that the reflection is normal and the SNCP switching is normal.

Root Cause

The fiber jumper connector is faulty. As a result, bit errors occur due to reflection and SNCP switching is triggered.

Suggestions and Summary

1. Alarm, performance, and optical power are the basic methods for locating WDM problems.

2. Common factors related to bit errors on the line side: a, non-linear effect; b, there is an abnormal reflection point on the line side

If you encounter same issue about NS4, you can refer to this article, it would be helpful.

The principles of DLAG feature of Huawei DWDM Equipment

When the main board like Huawei TN52SCC on Huawei OSN8800 or OSN6800  detects a failed port, the cross-connect board switches the services carried by the failed port from the main board to the slave board to protect the services.

Figure 1 shows the processing flow of a DLAG.

Figure 1 Processing flow of a DLAG 

In the transmit direction, the processing flow of the DLAG is described as follows:

• The cross-connect board of NE1 transmits the services to the main board and slave board of the DLAG. Then, the main board and slave board of the DLAG transmit the services to the equipment at the opposite end.
• When a link down failure, a board offline event, or a hardware failure occurs on the main board, the equipment at the opposite end receives the signals sent by the slave board.

In the receive direction, the processing flow of the DLAG is described as follows:

• The main board and slave board of NE1 transmit the main services and slave services sent from the opposite end respectively to the cross-connect board of NE1. The cross-connect board of NE1 selects services between the main services and slave services.
• When the main board works normally, the cross-connect board selects the services sent by the main board.
• When the main board detects a link down failure, a board offline event, or a hardware failure, the cross-connect board selects the services sent by the slave board to protect the services.