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).
Forcibly Specifying a Reference Clock Source for the Main Control Board

Forcibly Specifying a Reference Clock Source for the Main Control Board

Context

Generally, the system selects the clock source automatically. You can forcibly select the clock source of a clock in special situations, regardless of the clock source priority and SSM quality level.

You can specify a clock source in Signal-fail state in forcible mode, different from the manual mode.
  • When you forcibly specify a clock source to replace the original clock source of the system clock:
    • If the specified clock source is in Signal-fail state, the system automatically uses the inner clock as the reference clock source.
    • When the specified clock source recovers, the system automatically uses this clock source as the reference clock source.
  • When you forcibly specify a clock source to replace the original clock source of a BITS clock:
    • If the specified clock source is in Signal-fail state, the BITS clock automatically uses the system clock as the reference clock source.
    • When the specified clock source recovers, the BITS clock automatically uses this clock as the reference clock source.

Pre-configuration Tasks

Before forcibly specifying a reference 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.
    • The priority of the clock is other than 255 (DIS) so that the clock can function as the clock source.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

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

    A new reference clock source is forcibly specified for the system clock, BITS0 clock, 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 6-8 shows the mappings between the clock source numbers and clock sources.

    Table 6-8  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 forcible clock source selection.

  • Run the display clock mode [ slave ] command to view the mode of clock source selection.
  • Run the display clock selection [ slave ] command to view the current clock sources of the external clocks.
Translation
Download
Updated: 2019-08-21

Document ID: EDOC1000142080

Views: 106725

Downloads: 141

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next