Power consumption or Bandwidth? Need help...

[shaoalan79]

Recently had bad experience setting up Hikvision NVRs:

models: DS-7732NI-SP & DS-7716NI-SP.

In the case of DS-7732NI-SP, this model comes with 32CH(16CH in POE), I set up 16 3MP cams only, 13 of them directly into POE port, 3 of them through a POE switch then connected to the local router. It was running fine, but after one day, some of the cameras showing sign of 'no resources' on the display, some of them are showing fine in the 'grid look', but once I enlarge it into 'full screen' mode, it will show 'no resources'

I suspected this might be the bandwidth problem, but it is a 32CH machine with only 16cams hooked up only. Then I unplugged 4 cams from the POE, now, everything works fine.

Well, it might be power consumption? But only 13 cams are hooked up directly into the POE.

Anybody had any experience?

Thx,

 

[corkangel76]

have you tried dropping down to 10 cameras and see if it stablilizes? Its possible you are getting too much power draw.

 

[shaoalan79]

corkangel76,

Thanks. I did, it worked. But the problem is I had to throw into a poe switch, which increased my cost. 16poe machine should at least handle 16 cameras, if it can only handle 10 directly plugged into the poe ports, that might be a design fraud, am I right?

 

[alastairstevenson]

that might be a design fraud, am I right?

The PoE switches are rated in the specifications for the total power capability, not the number of unspecified cameras you could plug in.
If I remember correctly (I'm running it headless just now) my 7816N-E2/8P has a PoE rating of 105W.
Different cameras models vary in their power requirements, 16 of one could be quite different from 16 of another.

Does the VGA/HDMI output on your NVRs provide menu options to show the power budget status of the PoE ports including the power being consumed by each versus the power budget remaining?

 

[shaoalan79]

I believe the stated max power out from the machine poe is 200w. Each of my cams max power consumption is 5w. Means theoretically, there is no way 16cams will exceeded the max powerout from the machine.

 

[bp2008]

Total bit rate is something I'd be more concerned with. Some NVRs are a bit underspecced for the total bit rate they can pull in so you may need to reduce the bit rate on some of the cams.

 

[bp2008]

Evidently that NVR is designed to handle a MAX of 80 Mbps for the 16 port model and 160 Mbps for the 32 port model. I would make sure the cams are all 4 Mbps or less on their main streams. But also keep in mind I don't use hardware NVRs so I might have misconceptions about how they work.

 

[TechBill]

I believe the stated max power out from the machine poe is 200w. Each of my cams max power consumption is 5w. Means theoretically, there is no way 16cams will exceeded the max powerout from the machine.

Are you sure it not the max power supply size in the NVR? The mainboard and HDD takes a good amount of wattage from the power supply too so probably not leaving much left for the cameras.

Bill

 

[alastairstevenson]

The mainboard is under 10w, discs are under 5w (WD Purple 4TB).
The network traffic budget is calculated on the aggregate of what the max bitrate is set at on the cameras.
Both actuals of PoE power and network traffic load are shown against ratings on the VGA/HDMI menu pages.