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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Testing CES Services

Testing CES Services

After configuring CES services, you need to test connectivity of end-to-end CES services to ensure that they work properly.


Tools, Equipment, and Materials

BER tester or SDH analyzer, the U2000

Test Connection Diagram

Figure 1-12 shows the connection diagram for testing connectivity of CES service. You can replace the SDH analyzer with a BER tester.

Figure 1-12  Connection diagram for testing connectivity of CES services

  • Only commissioning engineers are present during the test.
  • Do not touch the cable, unless necessary.


  1. As shown in Figure 1-12, connect the CES service interface on NE1 to the BER tester.
  2. Perform an inloop for the UNI that receives CES services on NE2 on the U2000.
    1. In the Main Topology of the U2000, right-click the required NE and then choose NE Explorer from the shortcut menu. The NE Explorer window is displayed.
    2. Select the board that provides CES services.

      For CES services on an OptiX OSN 580, you need to select the SDH or PDH board for service access.

    3. Choose Configuration > Packet Configuration > Interface Management > PDH Interface from the Function Tree.
    4. Click the Advanced Attributes tab and then select the interface to perform a loopback.
    5. Right-click Loopback Mode, and then choose Inloop from the shortcut menu.
    6. Click Apply.
  3. Perform a 24-hour bit error test.


    Set the coding to HDB3 and pseudo-random binary sequence (PRBS) to 2 15-1 for the signals transmitted by the BER tester.

    Set the BER tester according to the encapsulation method that the CES services adopt and the frame format that the E1 interface adopts.
    • If the CES services adopt the SATop method, you need to enable the BER tester to transmit unframed signals, double-frame signals, or CRC-4 multiframe signals.
    • If the CES services adopt the CESoPSN method and the interface adopts the double-frame format, you need to enable the BER tester to transmit double-frame signals.
    • If the CES services adopt the CESoPSN method and the interface adopts the CRC-4 multiframe format, you need to enable the BER tester to transmit CRC-4 multiframe signals.

  4. Test the performance of the CES services. That is, check whether bit errors occur in the CES services in the 24-hour period.
  5. Check for the alarms associated with the CES services. If there is any, see the Alarms and Performance Events Reference and Troubleshooting to clear the alarms.
  6. Repeat 3 to 4 to perform the 24-hour bit error test again.
  7. Release the inloop that is set on the interface on NE2. For details, see 2.
  8. Reconnect the cable to the CES service interface on NE1.
  9. Repeat 1 to 8 to test the CES services on all the other 2 Mbit/s interfaces on NE1 and NE2.
  10. Repeat 1 to 9 to test connectivity of the CES services on the other NEs.
Updated: 2019-01-21

Document ID: EDOC1100020976

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