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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 TPS of the Electrical Interfaces

Testing the TPS of the Electrical Interfaces

The TPS function is configured to protect services at electrical interfaces. For this purpose, the TPS protection switching must be normal. This topic describes how to test the TPS.

Prerequisites

  • You are an NM user with Guests rights or higher.
  • The TPS on the tributary boards must be created and configured on the NMS.
  • E1/T1 services must be configured on the working board.

Tools, Equipment, and Materials

U2000, attenuator, fiber jumper, BER tester

Test Connection Diagram

Figure 1-6 shows the signal flow of the TPS. Figure 1-7 shows the actual TPS connection. In this test, the configurations of the equipment are as shown in the figure. The PD1 board in slot 122 is used to protect the PD1 boards in slots 121.

NOTE:

This section uses OptiX OSN 550 as example to describe how to configure. The methods for OptiX OSN 580 is similar.

Figure 1-6  Signal flow of the TPS

Figure 1-7  TPS test connection

Procedure

  1. On the ODF side, self-loop the transmit port and the receive port of the optical interface board.

    When performing a self-loop on the optical interface board, if the transmitted optical power is excessively high, add proper attenuators on the ODF side. Otherwise, excessive optical power causes damage to components.

    NOTE:
    Select proper attenuators for self-loop according to the mean launched optical power and the overload threshold specified in "Optical Interface Specifications" in the Product Description. Make sure that the mean launched optical power after being attenuated is 5 dB lower than the overload threshold but 3 dB higher than the minimum sensitivity.
    NOTE:

  2. According to Figure 1-7, connect the BER tester to the port of the tributary board with services configured. The BER tester displays no bit errors.

    NOTE:
    Use the BER test to test 2 Mbit/s services. Use the SDH analyzer to test the services at the other rates.

  3. Set the pseudo-random code for the meter according to the rate of the configured service. Table 1-11 lists the relations of the service rate, code and pseudo-random serial code.

    Table 1-11  Relations between the service rate, the coding, and the pseudo-random serial code

    Service Rate (kbit/s)

    Coding

    Pseudo-Random Serial Code

    2048 HDB3 215-1
    34368 HDB3 223-1
    44736 B3ZS 215-1
    139264 CMI 223-1
    155520 CMI 223-1

  4. Observe the ACT indicators of the working boards and the protection board. The indicators of the working board should be steady green. The indicator of the protection board should be off.
  5. Remove the working board. Observe the ACT indicator of the protection board. It should be steady green.
  6. Observe the BER tester:

    • Before switching the BER tester displays no bit error.
    • When switching the service becomes normal after a transient interruption, and the BER tester displays a small number of bit errors.
    • After switching the BER tester displays no bit error.
    NOTE:

    After the TPS protection is configured on the NMS, wait two minutes and then remove the working board to test switching because the system will take a certain period to set up TPS protection.

  7. Insert the working board. When the STAT indicator is steady green, go to the next step.
  8. Right-click the NE on the Main Topology of the NMS, and select NE Explorer from the shortcut menu.
  9. Choose Configuration > TPS Protection from the Function Tree. Click Query. A dialog box is displayed to prompt that the operation is successful. Click Close. Make sure that the Switching status of the protected board is WTR.
  10. After the end of the WTR time, query the switching state of the protection board again. The state should be Idle.
  11. Observe the board indicator. The ACT indicator of the working board should be steady green. The ACT indicator of the protection board should be off.
  12. Observe the BER tester:

    • When switching the service becomes normal after a transient interruption, and the BER tester displays a small number of bit errors.
    • After switching the BER tester displays no bit error.

  13. Release the loopback set in 1.

Follow-up Procedure

If testing TPS fails, rectify faults by referring to Failure to TPS Protection Switching.

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Updated: 2019-01-21

Document ID: EDOC1100020976

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