No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

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.

Rate and give feedback:
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).
Manually Specifying a Reference Clock Source for the Main Control Board

Manually Specifying a Reference Clock Source for the Main Control Board

Context

When clock sources are configured with priorities but not configured with SSM quality levels, you can manually specify a clock source if you need to select a clock with a lower priority as the clock source.

NOTE:
  • You cannot manually specify a clock source in Signal-fail state.
  • When the SSM quality level is used in clock source selection, you cannot specify a clock source whose SSM quality level is lower than the SSM quality level of the current clock source.
  • If the signal of the manually specified clock source becomes invalid or if the SSM quality level of the clock source degrades, the system automatically enters the free running state. The specified clock source never takes effect again even if its signal or quality level recovers.

Pre-configuration Tasks

Before manually specifying a clock source, complete the following tasks:

  • Set parameters of the link layer protocol and IP addresses for the interfaces to ensure that the link layer protocol on the interfaces is in Up state.
  • Configure the routing protocol to make the IP routes between the nodes reachable.
  • Ensure that the clock to be configured meets the following conditions:
    • All clock sources provide valid clock signals.
    • The result of frequency offset check does not affect clock source selection and the frequency offset of the clock sources is within the specified range.
    • The clock sources are not locked.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    clock manual-switch source source { system | bits0 | bits1 }

    A new reference clock source is manually specified for the system clock, BITS0, or BITS1 clock.

    • The number of the clock source for the system clock ranges from 0 to 8.
    • The number of the clock source for the BITS clocks ranges from 5 to 9.

    Table 6-9 shows the mappings between the clock source numbers and clock sources.

    Table 6-9  Mappings between the clock source numbers and clock sources

    Clock No.

    Clock Source

    0

    Inner Clock

    1

    BITS0

    2

    BITS1

    3

    Slave Board BITS0

    4

    Slave Board BITS1

    5

    Left Frame Clock

    6

    Right Frame Clock

    7

    FSU (reserved)

    8

    Slave Board FSU (reserved)

    9

    System Clock

Checking the Configuration

You can run either of the following commands to check the configuration of manual clock source selection.

  • Run the display clock mode [ slave ] command to check the mode of clock source selection.
  • Run the display clock selection [ slave ] command to check the current clock sources of the external clocks.
Translation
Download
Updated: 2019-12-28

Document ID: EDOC1000142080

Views: 123026

Downloads: 155

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Share
Previous Next