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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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(Optional) Setting the SSM Quality Level of a Clock Source

(Optional) Setting the SSM Quality Level of a Clock Source

Context

If the SSM quality level is used in clock source selection but the SSM quality level of a clock source cannot be obtained, you can specify the SSM quality level of the clock source using the clock ssm-config command.

If the S1 byte of a clock source obtained from the system is 0, the system considers the SSM quality level of the clock source as the unknown level. By default, the unknown level maps the DNU level and a clock source of this level is not selected. You can use the clock ql-unknown command to set the unknown level to a higher level so that the clock source can participate in clock source selection.

When the BITS interface selects the clock source based on the SSM quality level:
  • If the BITS clock works in BPS mode, the BITS interface obtains the SSM quality level from the received SSM message. If the SSM quality level can be obtained from the system, you do not need to run the clock ql-unknown and clock ssm-config commands. If the SSM quality level cannot be obtained, you can run the clock ql-unknown and clock ssm-config commands to specify the SSM quality level.
  • When the BITS clock works in 2 MHz mode, the clock does not have an SSM quality level. If the SSM quality level needs to be used in clock source selection, run the clock ssm-config command to set an SSM quality level for the clock.

Complete the following tasks according to the preceding description and actual situation.

Procedure

  • Setting the SSM quality level of a clock source
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      clock ssm-config { prc | ssu-t | ssu-l | sec | dnu } source source

      The SSM quality level of a clock source is set.

      By default, the SSM quality level of a clock source is SEC.

  • Specifying the SSM quality level mapping the unknown quality level
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      clock ql-unknown { prc | ssu-t | ssu-l | sec }

      the unknown quality level is specified.

      By default, the unknown quality level is Do Not Use (DNU).

      NOTE:

      This command is applicable to the clock source whose SSM value is 0. The device considers the SSM quality level of such a clock source as the value configured in this command.

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Updated: 2019-08-21

Document ID: EDOC1000142080

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