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NE20E-S2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - System Management
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Configuring the SyncE Function

Configuring the SyncE Function

This section describes how to configure the SyncE function.

Usage Scenario

On the IP RAN shown in Figure 15-1, clock synchronization needs to be achieved between NodeBs. The Atom GNSS timing solution can be deployed as follows to allow clock synchronization: Insert an Atom GNSS module into an ASG so that the Atom GNSS module can synchronize clock signals with the GNSS and the ASG can synchronize clock signals with the Atom GNSS module. Then, configure the SyncE function to allow transmission of clock signals to downstream devices and then to NodeBs. In this manner, network-wide clock synchronization is achieved.

Figure 15-1 Networking of Atom GNSS timing

Pre-configuration Tasks

Before configuring the SyncE function, complete the following task:

  • Configure the Atom GNSS module to properly process GNSS clock signals.

Configuration Procedure

Figure 15-2 Flowchart for configuring the SyncE function

Configuring the SyncE Function on an Atom GNSS Module

Context

NOTE:
The SyncE function is enabled on an Atom GNSS module by default, with no need for manual configuration.

Configuring the SyncE Function on the Device Where an Atom GNSS Module Houses

To achieve network-wide clock synchronization, the SyncE function needs to be configured on an router where the Atom GNSS module houses so that clock signals can be transmitted to downstream devices.

Context

Perform the following steps on the router equipped with an Atom GNSS module:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run clock synchronization enable

    Clock synchronization is enabled for the interface.

  4. Run clock priority priority-value

    A priority is configured for the clock reference source of the interface.

  5. Run quit

    Return to the system view.

  6. (Optional) Run clock ssm-control { on | off }

    The device is configured whether to select a clock source based on SSM levels.

  7. (Optional) Run clock run-mode

    An Ethernet Equipment Clock (EEC) running mode is configured.

  8. (Optional) Run clock switch

    A clock recovery mode is configured.

  9. (Optional) Run clock wtr wtr-time

    A clock WTR time is configured.

  10. (Optional) Run clock source-lost holdoff-time

    A clock holdoff time upon a timing signal failure is configured.

  11. (Optional) Run clock max-out-ssm

    The maximum output SSM level is configured for the interface clock source.

  12. (Optional) Run clock freq-deviation-detect enable

    Clock frequency offset detection is enabled.

  13. (Optional) Run clock input-threshold

    A lower quality threshold of external clock signals is specified.

Checking the Configurations

Context

After configuring the SyncE function of the Atom GNSS timing system, check the configurations.

Procedure

  • Run the display clock { config | source } command to check clock synchronization configurations and clock source configurations.
  • Run the display smart-clock interface interface-type interface-number command to check information about the Atom GNSS module on a specified interface.

Example

Run the display clock config command to check clock configurations on the NE20E.

<HUAWEI> display clock config 
 clock freq deviation detect:disable
 clock unk map              :dnu
 system pll run mode        :normal
 bits output threshold      :dnu
source input threshold     :sec
 tod protocol               :ubx

 switch config
    sys pll                 :auto mode
    2msync-1 pll            :auto mode
    SSM control             :on
    Extend SSM control      :off
    internal clockid        :0
    switch mode             :revertive
    wtr                     :5min
    holdoff time            :1000ms

 source config
 bits0
    Sync enable
    Sa-bit                  :sa4
    Signal-type             :2mbps                           

Run the display clock source command to check the status information about all clock sources or the clock source being tracked.

<HUAWEI> display clock source
System trace source State:    lock mode
                              into pull-in range
 Current system trace source: bits0
 Current 2M-1 trace source:   system PLL
 Frequency lock success:      yes

 Master board
 Source        Pri(sys/2m-1)   In-SSM     Out-SSM    State      Ref
 --------------------------------------------------------------------------
 bits0/          1/---         sec        dnu       normal     yes
 GE0/1/0         2/---         sec        sec       normal     yes
 GE0/2/0         3/---         sec        sec       normal     yes
 

Run the display smart-clock command to check information about the Atom GNSS module on a specified interface.

  GigabitEthernet0/1/0 smart-clock info
  Work state
  ------------------------------------------------------------------------
  Time lock success :yes                Self-recovery enable :yes
  Freq lock success :yes                Self-recovering      :no

  Gnss info
  ------------------------------------------------------------------------
  Latitude          : 40 º3 '13"N      Altitude             : 65.37 (m)
  Longitude         : 116º10'44"E      Work mode            : auto
  Cable delay      : 20(ns)          Fix  status          : fix   
  Gnss time          : 2016/12/27  10:16:45    
  Leap manual mode  : enable           Leap second        : 17       
  Next leap direction: leap59          Next leap date    : 2017/12/31 
  Config gnss model  : gps gps-glonass beidou gps-beidou glonass 
  Current gnss model : gps-glonass   
  Gps satellite num      : 8        cn0: 41-40-20-47-45-26-38-23-0-0-0-0 (dbHz) 
  Glonass satellite num  : 8     cn0: 44-51-48-37-40-44-44-42-0-0-0-0 (dbHz)
  beidou satellite num   : 8     cn0: 00-00-00-00-00-00-00-00-0-0-0-0 (dbHz)

  Sync parameter
  ------------------------------------------------------------------------
  Domain value      : 0                 Clock step           : one-step
  Priority1         : 0                 Delay mechanism      : delay
  Priority2         : 0                 Sync interval        : 3
  Clock class       : 6                 Announce interval    : 7
  SSM               : prc               Delay-req interval   : 7
  Clock ID          : bc620efffe4ed11f

  Board info
  ------------------------------------------------------------------------
  Version           : 1.0
  Mac address       : bc-62-0e-4e-d1-1f
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Updated: 2019-01-02

Document ID: EDOC1100055400

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