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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).
Configuring Clocks

Configuring Clocks

A clock is the basis for the normal operation of an NE. You need to configure the clocks for all the NEs before configuring services. In addition, you need to configure the clock protection in the case of a complicated network.

Configuring the NE Clock Source

Before configuring services, you must configure the NE clock source and specify the priority level to ensure that correct clock trace relations are created for all the NEs on the network.

Prerequisites

You are an NM user with Operator Group rights or higher.
Background Information
  • To implement clock protection, you must configure at least two traceable clock sources for the equipment. Generally, the tributary clock is not used as the clock source for the equipment.
  • After you set the clock sources for all the NEs, query the networkwide clock trace status again. For details, see Querying the Clock Trace Status.

Procedure

  1. In the NE Explorer, select an NE and choose Configuration > Clock > Physical Layer Clock > Clock Source Priority from the Function Tree.

  2. Click Query to query the existing clock source.
  3. Click Create. In the Add Clock Source dialog box, select a new clock source and click OK.
  4. Optional: If an external clock source is selected, select External Clock Source Mode according to the type of external clock signals. In the case of the 2 Mbit/s clock, specify the Synchronous Status Byte to deliver the SSM message.
  5. Select a clock source and click or to adjust its priority level. The clock sources are arranged in the descending order. The clock source at top is the preferred clock source for the NE.

    NOTE:

    Internal clock sources have the lowest priority because of their low precision.

  6. Click Apply. Then, click Close in the Operation Result dialog box indicating that the operation succeeded.

    NOTE:

    If the clock trace relation changes according to the change of the clock source, the Prompt dialog box is displayed, asking you whether to refresh the clock trace relation. Click OK. If Disable Prompting Next Time is selected, the Prompt dialog box is not displayed even if the clock trace relation changes.

  7. Optional: If you select the line clock as the phase-locked source, you need to specify the priority table for the phase-locked sources. Click the Priority for PLL Clock Sources of 1st External Output tab, and then click Create. In the dialog box that is displayed, select the phase-locked source, and click OK.
  8. Click Apply. In the dialog box that is displayed, click Close.

Configuring the Clock Source Protection

On a complicated clock network, you need to configure the clock protection for all the NEs. After you set the clock source and specify the clock priority level for the NEs, you can enable the standard SSM or extended SSM protocol to prevent the NEs from tracing an incorrect clock source.

Prerequisites

You are an NM user with Operator Group rights or higher.

Procedure

  1. In the NE Explorer, select an NE and choose Configuration > Clock > Physical Layer Clock > Clock Subnet Configuration from the Function Tree.
  2. Click the Clock Subnet tab. Click Query to query the existing parameter settings.
  3. Select Start Standard SSM Protocol or Start Extended SSM Protocol.

    NOTE:

    The same SSM protection protocol must be used for the NEs within the same clock protection subnet.

  4. Set the subnet number of the clock subnet to which the NE is associated.

    NOTE:

    Allocate the same subnet number to the NEs that trace the same clock source.

  5. Optional: If the extended SSM protocol is enabled, set the clock ID of the clock source.

  6. Click Apply. Click Close in the Operation Result dialog box indicating that the operation succeeded.
  7. Optional: If the clock ID is specified for the line clock of an NE, click the Clock ID Status tab, and set Enabled Status to Enabled. Click Apply. Click Close in the Operation Result dialog box indicating that the operation succeeded.
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Updated: 2019-01-21

Document ID: EDOC1100020976

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