NTP Synchronization

Customer Provides the NTP Server

Figure 4-1 shows the scenario where the customer provides the NTP server.

Figure 4-1 NTP deployment

Customer Does Not Provide the NTP Server

Figure 4-2 shows the scenario where the customer does not provide the NTP server.

In this scenario where the HWT-IVS1800 functions as the NTP server, you need to manually configure the time and then time synchronization of the HWT-IVS1800. The HWT-IVS1800 that functions as the NTP server needs to synchronize time to the cameras.

• Time synchronization is configured on the HWT-IVS1800. For details, see Configuring Time Synchronization with the NTP Server for the .
• The cameras synchronize time with the HWT-IVS1800.
  • For details about how to configure time synchronization for HWSDK- or ONVIF-compliant cameras, see Procedure (HWSDK/ONVIF).
  • For details about how to configure time synchronization for GB/T 28181- or RTSP-compliant cameras, see Procedure (GB/T 28181 or RTSP).

Figure 4-2 NTP deployment

Context

• If the NTP server is configured for the first time, the forcibly synchronizes time from the NTP server. If the time on the NTP server is saved for multiple times, forcible time synchronization is triggered only upon the first-time saving.

  For example, if the time on the NTP server is 2020-11-11 11:11:11, the time of the will be forcibly synchronized to 2020-11-11 11:11:11 after time synchronization with the NTP server is configured.

• After the NTP server is configured, the time synchronization rules are as follows:
  • If the time difference between the and the NTP server is within 600 seconds, the synchronizes time with the NTP server by 0.5 milliseconds per second.

    In this scenario, the synchronization of 600 seconds takes about 14 days in total.

  • If the time difference between the and the NTP server exceeds 600 seconds, the will not synchronize time with the NTP server.

Procedure (on the OMU Portal)

1. Log in to the OMU portal as the admin user. ( Logging In to the OMU portal)
2. Choose System > Time Configuration.
3. Configure time information of the server.

   • If an NTP server is configured, synchronize the time from the NTP server, as shown in Figure 4-3.

     Figure 4-3 Configuring NTP time synchronization
     

     Table 4-4 describes the parameters.

     Table 4-4 Parameters/Buttons for automatic time synchronization with the NTP server

     Parameter/Button	Description
     NTP Server IP Address	IP address of the NTP clock source server. The value can be an IPv4 or IPv6 address. After the IP address is set, the device synchronizes time with the clock source.
     	If you click Verify, the system will check whether the communication with the clock source is normal. NOTE: If Synchronize System Time With PUBLIC CLOUD is toggled on, NTP time synchronization previously configured for the HWT-IVS1800 (if any) will turn invalid.
     Time Zone	Current time zone of the device.
     Time Settings	Device time. You can manually change the time.
     	If you click Synchronize, the time is manually synchronized with the NTP server.
     Device Time	Current server time.
     Sync Time to Camera	Indicates whether to synchronize the server time to the camera connected to the device. NOTE: Cameras connected through HWSDK or ONVIF automatically time-synchronize with the server. For cameras connected through GB/T 28181 or RTSP, you need to separately configure time synchronization in the camera web system.
     Setting the DST	Indicates whether to enable DST. If DST is used locally, toggle on this parameter. After the DST is configured, the time zone cannot be changed. Therefore, set the time zone before setting the DST. If you need to change the time zone after setting the DST, disable the DST first.
     Week	DST mode.
     Date
     Start Time	Start time of the DST.
     End Time	End time of the DST.
     Offset Time	Offset time of the DST.
     Save	Button for saving all settings. After you click this button, the system automatically checks the current NTP server status of the device (specified by Local Status). NTP Online NTP Abnormal
     Cancel	Button for restoring data to the state last saved.

   • If no NTP server is deployed onsite, you need to manually configure time and then time synchronization of the HWT-IVS1800.
     1. Choose System > Network Configuration and check the IP address of the device.
     2. Choose System > Time Configuration > Manual Setting and configure the time correctly, as shown in Figure 4-4. Table 4-5 describes the parameters.
        Figure 4-4 Manually configuring server time
        
        Table 4-5 Parameters/Buttons for manual time configuration

        Parameter/Button	Description
        Time Zone	Current time zone of the device.
        Time Settings	Device time. You can manually change the time.
        Device Time	Current server time.
        Sync Time to Camera	Indicates whether to synchronize the server time to the camera connected to the device. NOTE: Cameras connected through HWSDK or ONVIF automatically time-synchronize with the server. For cameras connected through GB/T 28181 or RTSP, you need to separately configure time synchronization in the camera web system.
        Setting the DST	Indicates whether to enable DST. If DST is used locally, toggle on this parameter. After the DST is configured, the time zone cannot be changed. Therefore, set the time zone before setting the DST. If you need to change the time zone after setting the DST, disable the DST first.
        Week	DST mode.
        Date
        Start Time	Start time of the DST.
        End Time	End time of the DST.
        Offset Time	Offset time of the DST.
        Save	Button for saving settings.
        Cancel	Button for restoring data to the state last saved.

     3. Set Mode to NTP, set the IP address of the NTP server to the IP address of the device, and click Save.

4. Enter the password of the current login user and click OK to verify the password.

Procedure (on the LDU)

1. Log in to the LDU as the admin user. ( Logging In to the LDU)
2. Click in the upper left corner to access the main menu.
3. Choose System Management > System Settings > Time.
4. Configure NTP time synchronization.
   • If an NTP server is deployed onsite, synchronize time with the NTP server, as shown in Figure 6-68.
     Figure 4-5 Configuring NTP time synchronization
     
   • If no NTP server is deployed onsite, you need to manually configure time and then time synchronization of the HWT-IVS1800.
     1. Choose System Management > System Settings > Network and check the IP address of the device.
     2. Choose System Management > System Settings > Time > Configure manually, configure the time correctly, and click Save.
     3. Click Sync with NTP server, set the IP address of the NTP server to the IP address of the device, and click Save.

Context

• HWSDK- or ONVIF-compliant cameras can automatically synchronize time with the HWT-IVS1800.

• For GB/T 28181- or RTSP-compliant cameras, you need to configure time synchronization with the HWT-IVS1800 one by one.

Important Notes

• If the cameras are connected to the device through HWSDK or ONVIF, configure time synchronization by referring to Procedure (HWSDK/ONVIF).
• If the cameras are connected to the device through GB/T 28181 or RTSP, configure time synchronization by referring to Procedure (GB/T 28181 or RTSP).

Procedure (HWSDK/ONVIF)

1. Log in to the OMU portal as the admin user. ( Logging In to the OMU portal)
2. Configure cameras to synchronize time with the HWT-IVS1800 in either of the following ways:
   • On the Time Configuration page (The time synchronization function is enabled by default on this page):
     1. Choose System > Time Configuration.
     2. Toggle on Sync Time to Camera and click Save.
        

        If Sync Time to Camera is toggled on under System > Time Configuration on the OMU portal, the system automatically restarts the SCU module and resets NTPIPC to 0.

   • On the Advanced Configuration page:
     1. Choose System > Advanced Configuration.
     2. Set NTPIPC to 0 (default), as shown in Figure 4-6.
        Figure 4-6 Setting SCU parameters
        

        After NTP time synchronization is enabled for a camera, the camera automatically synchronizes time with the HWT-IVS1800.

     3. (Optional) Configure the post-NAT IP address of the HWT-IVS1800, as shown in Figure 4-7. This step is required only when the HWT-IVS1800 is located on an intranet.
        Figure 4-7 Setting PUBLIC parameters
        

Procedure (GB/T 28181 or RTSP)

1. (Optional) Configure the post-NAT IP address of the HWT-IVS1800. This step is required only when the HWT-IVS1800 is located on an intranet.
   1. Log in to the OMU portal as the admin user. ( Logging In to the OMU portal)
   2. Choose System > Advanced Configuration.
   3. Set PUBLIC parameters, as shown in Figure 4-8.
      Figure 4-8 Setting PUBLIC parameters
      

2. Log in to the camera web system as the admin user. ( Logging in to the Camera Web System)
3. Choose Settings > System > Time.
4. Configure NTP time synchronization, as shown in Figure 4-9.
   Figure 4-9 Configuring NTP time synchronization
   

   Table 4-6 describes the parameters.

   Table 4-6 Parameter description

   Parameter	Setting
   Time zone	Select the time zone where the HWT-IVS1800 is located.
   Calibration mode	Select NTP.
   NTP server	Enter the actual IP address of the HWT-IVS1800.
   Check	Check whether the network connection between the camera and the NTP server is normal.
   Synchronization interval (min)	Set the interval for the camera to synchronize time with the HWT-IVS1800 as required. The camera automatically synchronizes time with the HWT-IVS1800 at the synchronization interval.

Verification

1. Log in to the camera web system as the admin user. ( Logging in to the Camera Web System)
2. Choose Settings > System > Time.
3. View the current time of the camera, as shown in Figure 4-10.
   Figure 4-10 Viewing the time
   

4. Check whether the device time is the same as the time of the HWT-IVS1800.

   If not, reconfigure NTP time synchronization for the camera.