Q: What is the difference between a DVR and an NVR (Network
A: A DVR is a PC with a built in hard drive and video board—all
in one box. DVR’s are proprietary technology and considered
closed systems. NVR systems utilize RTOS (real time OP system) Linux
video servers and IP net cams. This means the video board or compression
is out of the box. It does only one thing: compress analog video
signals and stream video over the network. Any PC/Server or network
attached storage (NAS) device then becomes the NVR. Basically, NVR’s
have no video board or no compression; DVR’s have a video
board or do compress video.
Q: How can NVR architecture benefit a customer?
A: The customer now has choices. For example, he can store the video
on any network drive on the LAN. This can save space and money.
He can use any existing PC on the network to make his recorder.
Q: Are NVR systems more reliable then DVR’s?
A: Absolutely! Remember the video server has only one purpose: to
compress video and stream video. This is accomplished on a RTOS
Linux based technology, a very reliable technology that is virtually
maintenance free. Because DVR’s are nothing more than a PC
with a video board (most boards usually are imported from Taiwan)
and built in hard drives, they tend to crash. The only way to repair
them is to replace the entire DVR. This can be very costly if you
are running 16 cameras and also becomes a major security risk.
Q: What about network Security? Hackers and virus attacks:
which system is more secure?
A: By far, the NVR video platform. It is a Linux embedded system
and as such is much more network secure from hackers and virus attacks
than the Windows OS that DVR’s utilize.
Q: This sounds good but I still have to have a PC with your
A: Again, as stated earlier, what is a DVR? It is a PC with a keyboard,
mouse, and monitor. If you purchase a DVR, you have now added a
new PC with monitor to your network. When you purchase an NVR system,
you have the choice to use your existing PC or adding a new one.
Q: Does this mean that as PC technology improves I can just
swap out PC’s to maximize on the change of technology and
get the most benefit from my NVR system?
A: Yes! That is why we call our NVR systems open and scalable.
Q: What happens to my DVR performance as PC’s become
faster, more efficient, more reliable, and cheaper?
A: Nothing! The closed, proprietary DVR system you purchased today
is the same old technology for you tomorrow.
Q: Are network cameras available and are they efficient
A: Yes, they are available and they are very efficient and reliable.
Analog cameras will soon be bygone history. Just like the analog
picture cameras and video camcorders are being phased out with digital
cams and digital camcorders, so are analog cams.
Q: Can I use IP network cams with my DVR?
A: No! DVR’s have a video board that is used to convert analog
cams to digital. You cannot connect a network cam to the DVR. You
could connect a network cam to stream and view live video but you
could not record and playback. Special software is required for
Q: Does your NVR system software work with both IP cams and video
servers so I can have a combo of analog and network cams?
A: Yes. Our system software can manage hundred of cameras, either
analog or IP network cams.
Q: Does your NVR video interface with the Point of Sale
Q: How do you interface? Serial or Network interface connection?
A: We only interface via the network TCP layer. We are a pure network
Q: How do most the DVR’s interface to the POS then?
A: Through the serial port on back of the cash terminal or the pole
Q: What are the advantages of a network interface (NI) over
a serial interface (SI)?
A: Many. Namely, with a NI , you can capture all the POS text messages
by keystroke in real-time. SI only captures POS data that goes to
the receipt. This means if there is no receipt printed, you have
no data to search for with the video. With a NI system, you can
capture and playback any of the POS transactions or events whether
it was printed to the receipt or not. This method gives the end
user much more suspect data to search on.