POE vs Non-POE NVR

B

bigeye

n3wb
Feb 15, 2019
22
1
UK
Hi,
I have a 48-port POE gigabit switch at home. That should make any NVR purchasing decision a non-brainer. I can connect cameras to the POE ports on the switch and connect the NVR via its management port...

However, I've realised that Dahua NVRs only have a fast ethernet LAN interface. Doesn't this mean that my cameras could well saturate this link and so make buying a non-poe NVR counterproductive?


Regards,
Dave
 
Most, if not all camera's have a fast ethernet only connection. So gigabit will not be used.

Gigabit on a switch could be used for uplinks and so on.

What i don't get in your post is, why you compare PoE vs non PoE, as this is only a term for powering a device over ethernet (Power over Ethernet). It has nothing to do with the speed.
 
SkyLake said:
Most, if not all camera's have a fast ethernet only connection. So gigabit will not be used.

Gigabit on a switch could be used for uplinks and so on.

What i don't get in your post is, why you compare PoE vs non PoE, as this is only a term for powering a device over ethernet (Power over Ethernet). It has nothing to do with the speed.
Click to expand...

Okay, I'll try to be clearer. As you say, POE is for powering the cameras. A POE capable NVR costs more money, so if I already have a POE capable switch to power the cameras it makes sense to get a non-POE NVR. This would connect to a standard port on the same switch to aggregate the inputs from the cameras...
However, if for the sake of argument you have 16 cameras sending at high data rates, then the 100MB/sec uplink to the NVR will become a bottleneck. Whereas, were those 16 cameras directly connected to POE ports on an NVR there would be no bottleneck other than the I/O capacity of the NVR itself.
 
Last edited:
Looks like a typo in that vendor's description. The link a bit up should bring up of the official Dahua spec sheet.
 
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I have the 5216 and can confirm the nvr has gigabit up link. Mine has poe but to answer your question, if you connect your cameras to the poe switch and nvr to it (via the uplink port) it should work fine. That's how non poe would work.

As for 16 cameras, that'll depend how active they are and bandwidth they each use etc. So 16 cameras at max butyrate might struggle through the gigabit nic.. Someone with more knowledge on this might be able to confirm that.
 
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Jagradang said:
I have the 5216 and can confirm the nvr has gigabit up link. Mine has poe but to answer your question, if you connect your cameras to the poe switch and nvr to it (via the uplink port) it should work fine. That's how non poe would work.

As for 16 cameras, that'll depend how active they are and bandwidth they each use etc. So 16 cameras at max butyrate might struggle through the gigabit nic.. Someone with more knowledge on this might be able to confirm that.
Click to expand...
I suspect the ability of the NVR itself to process and write the data would be the primary bottleneck. But thanks for the clarification. Very helpful...
 
I've had 22 cams connected to my 5232-non poe- . Even at high bit rates the nvr can handle them fine as long as you use a gigabit switch.
 
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