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MAC address conflict.
PC or DVR network card is not good.
16. Burn error /USB back error.
There are following possibilities:
Burner and DVR are in the same data cable.
System uses too much CPU resources. Please stop record first and then
begin backup.
Data amount exceeds backup device capacity. It may result in burner error.
Backup device is not
compatible.
Backup device is damaged.
17. Keyboard can not control DVR.
There are following possibilities:
DVR serial port setup is not correct.
Address is not correct.
When there are several switchers, power supply is not enough.
Transmission distance is too far.
18. Alarm signal can not been disarmed.
There are following possibilities:
Alarm setup is not correct.
Alarm output has been open manually.
Input device error or connection is not correct.
Some program ver
sions may have this problem. Please upgrade your
system.
19. Alarm function is null.
There are following possibilities.
Alarm setup is not correct.
Alarm cable connection is not correct.
Alarm input signal is not correct.
There are two loops connect to one alarm device.
21. Record storage period is not enough.
There are following possibilities:
Camera quality is too low. Lens is dirty. Camera is installed against the light.
Camera aperture setup is not correct
HDD capacity is not enough.