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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Verifying the Correctness of the SDH Service Configuration

Verifying the Correctness of the SDH Service Configuration

According to the alarm reported on the U2000 and MSP switching status, you can check whether the service configuration is correct. In addition, you can obtain the service switching time from the SDH test meter.


  • The creation of the physical topology of the network must be complete.
  • NEs, boards, and fibers must be successfully created on the U2000.
  • The SDH test meter must be correctly connected to the source end and the sink end, and the corresponding service type and rate must be configured.
  • You must be a U2000 user with "NE and network administrator" authority or higher.

Background Information

When the service type and rate are set on the test meter, the "SIGNAL" and "FRAME" indicators of the SDH analyzer turn green from red and are constantly on. If no alarm indicator is flashing on the test meter, it indicates that the SDH test meter is connected properly to the network.

Test Connection Diagram

As shown in Figure 2-84, the SDH test meters are connected to the source end and sink end of the network to be tested. At the same time, the U2000 must be connected properly to the network to be tested.

Figure 2-84  Test connection diagram


An optical attenuator should be added at the "TX" optical interface on the board that is directly connected to the SDH test meter. You also need to add an attenuator at the "RX" optical interface if required. In this case, the attenuator can prevent the damage due to excessive optical power on the test meter and board.


  1. Enable the SDH test meter at the source end and the SDH test meter at the sink end to monitor the service switching in the network.
  2. In the Main Topology of the U2000, right-click the source NE and choose NE Explorer. In the board directory tree on the left pane, Select the line board for service transmission. Then, choose Configuration > SDH Interface from the Function Tree.
  3. On the right pane, set Laser Switch to Off.
  4. Click Apply. Then, the Confirm dialog box is displayed. Click OK.

    By performing Steps 2-4, you can shut down the laser that transmits services at the source end. In this case, the service on the working path is interrupted and the service switching condition is met.

  5. Choose Fault > Browse Current Alarm from the Main Menu on the U2000.
  6. Click OK in the Filter dialog box that is displayed. In the Current Alarm window, you can browse various alarms such as the R_LOS alarm reported by the line board of the sink NE that is directly connected to the line board of the source NE and whose laser is shut down, and tributary alarms reported by the tributary boards on the source NE and sink NE. For the meanings of alarms and handling methods, see Alarms and Performance Events.
  7. The service interruption time displayed on the RESULT TS window on the test meter is equal to the service switching time.

    On the test meter, the LONGEST and SHORTEST parameters in the RESULT TS window record the longest switching time and the shortest switching time when the switching is performed multiple times. The LAST parameter records the time of the latest switching.

  8. Query the switching state and service state on the U2000.

    Querying the MSP switching status is different from querying the SNCP switching status. Refer to Steps 9-11 to query the MSP service status. Refer to Steps 12 and 13 to query the SNCP service status.

  9. Choose Service > SDH Protection Subnet > Maintain SDH Protection Subnet from the Main Menu on the U2000.
  10. Click the Protection Subnet Maintenance tab on the right side of the SDH Protection Subnet Common Attributes pane. Query East Status and West Status. If the status is "Signal Fail Switching - Ring", "SF Switching - Span", or "Lockout of protection-Span", the MSP switching is successful.

  11. Choose Fault > Browse Current Alarm from the Main Menu on the U2000. If no service alarm is reported from the working path, the service switching is successful.

    According to the verification result obtained by performing Steps 10 and 11, the configuration of MSP ring services is successful.

  12. Select the NE to be queried in the Main Topology on the U2000, right-click the NE, and choose NE Explorer. Then, choose Configuration > SNCP Service Control from the Function Tree.
  13. Query Current Status, Trail Status, and Active Channel from the Working Service list and Protection Service list on the right pane to check whether the service is switched successfully.

    The service switching and SNCP service configuration are successful if the following conditions are met: 1. The current status is SF switching. 2. The status of the working service path is SF. 3. The status of the protection service path is normal. 4. The current path is the protection path.

Updated: 2019-01-21

Document ID: EDOC1100020976

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