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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).
Testing the Clock Protection Switching

Testing the Clock Protection Switching

Clock synchronization is critical to services on a network. To prevent service interruption due to a clock failure, clock availability needs to be tested and ensured.

Testing SDH Clock Protection Switching

The SDH clock protection switching is performed to protect SDH clocks and to make sure that the SDH clocks of all NEs are synchronous. To prevent the SDH clock failure, you need to perform the SDH clock protection switching.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • The clock parameters and clock protection subnet must be configured. For details, see "Configuring Clocks" in the Configuration Guide (SDH Transport Domain).
Tools, Equipment, and Materials

U2000

Procedure

  1. In the NE Explorer, select an NE and choose Configuration > Clock > Physical Layer Clock > Clock Source Switching from the Function Tree.
  2. Click the Clock Source Switching tab, and click Query to query the current switching status of the current clock source.
  3. Shut down the laser. Query the current clock source switching status of the NE.
  4. Choose Fault > Browse Current Alarm... from the Main Menu. Click the Alarm Source tab in the Filter dialog box. Select the NE selected in Step 3 from the NE list, and click OK to query alarms. Normally, the SYNC_C_LOS alarm is reported.

    NOTE:
    • If you shut down the laser in Step 3, the MS_RDI alarms also occurs on the NE.
    • If other alarms occur, clear them by referring to the Alarms and Performance Events Reference.

  5. Turn on the laser.

    NOTE:

    After the laser is turned on again, the icon of the MS_RDI alarms turns green, which indicates that the alarms are cleared.

  6. Repeat Steps 1-5 to complete the test of west clock switching of the NE.
  7. Test the clock switching of the other NEs by using the same method.

Testing CES ACR Clocks

The circuit emulation service (CES) adaptive clock recovery (ACR) clock adopts the ACR technology to recover the clock synchronization information transmitted in CES services. It ensures the ACR clock synchronization of all NEs in the PSN, which is very important to CES services. CES ACR clocks are classified into two types: standard CES ACR clock and enhanced CES ACR clock. To ensure that all the clocks on the PSN are synchronous, you must test the CES ACR clocks.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • All CES ACR clock parameters must be configured properly on each NE. For details, see Configuring the CES ACR Clock in Feature Description.
Tools, Equipment, and Materials

BER tester or SDH analyzer. U2000

Test Connection Diagram

Figure 1-31 shows the connection diagram for testing CES ACR clocks.

Figure 1-31  Connection diagram for testing CES ARC clocks

Procedure

  1. Right-click NE1 and choose NE Explorer from the shortcut menu.
  2. check whether Clock Mode is Slave Mode:

    • OSN 550/500: Choose Configuration > Packet Configuration > Interface Management > PDH Interface> > > from the Function Tree and check whether Clock Mode is Slave Mode.
    • OSN 580: Choose Configuration > Interface Management > Path Configuration from the Function Tree and check whether Re-timing Mode is Slave.

  3. Choose Configuration > Clock > ACR Clock from the Function Tree and check the settings of CES Service, Track Mode and Lock Status. The Track Mode of NE1 should be Slave Mode and Lock Status should be Locked.
  4. Choose Configuration > Clock > Clock Domain from the Function Tree to check the setting of Clock Domain, Clock Domain Board and Clock Port.
  5. Choose Fault > Browse Current Alarm from the Main Menu.
  6. In the Filter window, click the Alarm Source tab and click Custom. Click Add and choose NE to add NE1 to Selected Alarm Source. Then, click OK to start the filter.



  7. Check the alarms reported by NE1. If the CES ACR clock is locked abnormally, a CES_ACR_LOCK_ABN alarm is reported.

    NOTE:

    The lock time of the CES ACR clock is related to the network PDV. If the CES_ACR_LOCK_ABN alarm persists for 2 hours after the configuration, check the network and the CES ACR configuration. Refer to Alarm and Event Handling for possible causes and troubleshooting procedures.

  8. Right-click NE2 and choose NE Explorer from the shortcut menu.
  9. check whether Clock Mode is Master Mode:

    • OSN 550/500: Choose Configuration > Packet Configuration > Interface Management > PDH Interface> > > from the Function Tree and check whether Clock Mode is Master Mode.
    • OSN 580: Choose Configuration > Interface Management > Path Configuration from the Function Tree and check whether Re-timing Mode is Master.

  10. Test the CES ACR clock of NE2 by following instructions in 3to 7.
  11. Test bit errors in the CES services using the BER tester or SDH analyzer. In normal situation, no bit error is tested. If bit errors are tested, it indicates that the CES ACR clock configuration fails.

Follow-up Procedure

None

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Updated: 2019-01-21

Document ID: EDOC1100020976

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