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NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE40E-M2 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 14-1, clock synchronization needs to be achieved between NodeBs. The Atom GPS timing solution can be deployed as follows to allow clock synchronization: Insert an Atom GPS module into an ASG so that the Atom GPS module can synchronize clock signals with the GPS and the ASG can synchronize clock signals with the Atom GPS 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 14-1 Networking of Atom GPS timing

Pre-configuration Tasks

Before configuring the SyncE function, complete the following task:

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

Configuration Procedure

Figure 14-2 Flowchart for configuring the SyncE function

Configuring the SyncE Function on an Atom GPS Module


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

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

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


Perform the following steps on the Router equipped with an AE 905S module:


  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


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


  • 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 GPS module on a specified interface.


Run the display clock config command to check clock configurations on the NE40E.

<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
    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 GPS 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
  Satellite number  : 7                 Leap second          : 17
  Satellite cno     : 28-16-46-41-27-26-25-0-0-0-0-0 (dbHz)

  Gps time          : 2016/07/08  07:26:52

  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
Updated: 2019-01-02

Document ID: EDOC1100058392

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