[DW-VG4 / DW-VP] V-CLASS camera osd time issue after VMAX reboot

Description

V-CLASS CAMERA SERIES: DWC-VSBD04Bi, DWC-VSBD04Mi, DWC-VSDG04Bi, DWC-VSDG04Mi, DWC-VSTB04Bi, DWC-VSTB04iB, DWC-VSTBO4Mi

VMAX INTERNAL POE SWITCH

DW-VP09: 1.5.5.7

DW-VG4: 1.5.5.7

This issue was orginially reported to TVT, their R&D team requested to check with Focus.

After rebooting the VMAX NVR, the camera time becomes incorrect, regardless of the time synchronization method used (sync to computer time, manual sync, or NTP sync). The time does not update correctly in any of the selected time modes.

Here are the steps I followed to reproduce the issue:

I set up 3 different v-class models with different time synchronization modes (e.g., sync to computer time, manual sync, NTP sync).
Reboot the VMAX NVR.
After reboot, check the camera time OSD.

TVT response:

After R&D test to add the camera to VMAX NVR through internal PoE switch, and analyze the camera log, they find in the log there is only one record of camera itself synchronize the time after reboot, and there is no log record of other device synchronize the time to the camera.

So R&D confirm that the NVR didn't synchronize the time to camera automatically.

We suggest to check from NVR side, why the NVR didn't send the time synchronization command