thanks a lot for your response.
A last question: I have this DVR, but I dont have a Monitor, I use just à PC (on a switch) to get this web interface and configure it. In fact, I made a stupidity: I changed the IP configuration of the DVR from the factory Fixed IP(192.168.1.10) to DHCP. So now, I can't get access to DVR anymore.
Do you know how the get the DVR back to the factory configuration (make a factory reset) ? I tried to remove battery that is inside the DVR and put it again after a minute, but it doesn't get back the default IP configuration (it just changes the time configuration I suppose)
thanks