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IP POE CAMERAS MAX DISTANCE TO NVR


 
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ashhab
New Member


Joined: 05 Feb 2014
Posts: 1

PostPosted: Tue Feb 11, 2014 1:12 am    Post subject: IP POE CAMERAS MAX DISTANCE TO NVR Reply with quote

Hello i have an install for two residential buildings and they want to start with 10 cameras in both buildings and i want to use cat5e to enhaul video through out. Basically there is 5 in each building so I was thinking to get 16ch NVR with 8 poe ports and 8 ports poe switch from trendnet.
Each cameras wont have cat5e ran for over 250FT.

Is it possible to setup the POE switch in one building and connect the five ip cameras to it and connect cat5e from the poe switch to the router in the other building(where the nvr will be installed).

Also, can i connect the other five cameras directly to NVR? would that cause any power issues in the future? if i connect the NVR to the same router as poe connected to. How can i search for IP cameras and is it possible to setup port forwarding for remote viewing if the ISP (Bell Canada) doesnt allow static IP for free.

Please let me know your thoughts

Thanks
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buellwinkle
Wizard


Joined: 28 Mar 2008
Posts: 2504

PostPosted: Sun Feb 16, 2014 1:34 am    Post subject: Reply with quote

the 250' is not a problem and having multiple PoE switches is also not a problem. The only problem may be an NVR with a PoE switch built in. What happens is it acts sort of like a router and gives those cameras their own subnet and IP addresses that you can't access from outside the NVR where the other cameras will be on your network and Ip addresses in your subnet. It's easier if you just get PoE switches or injectors outside the NVR.

For example, I have a PoE switch at the front of my home and one at the rear and a line between them.
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pacowilson
Regular Member


Joined: 03 Mar 2012
Posts: 36

PostPosted: Sun Nov 30, 2014 6:15 am    Post subject: Reply with quote

Regarding to PoE power issue, here are something I want to say:

1. Recommend to use the PoE switch
2. PoE IP camera can connect to PoE NVR directly, but this will suffer voltage drop during medium distance transmission.
3. Use the low power consumption of PoE IP camera (ideally non-IR IP camera)

Recently, one of clients met a problem, the PoE IP camera connected to NVR, it worked in day, but couldn't see anything at night.

The reason is IP camera consumed less power when IP camera works in day. At night, the power couldn't provide sufficient power to turn on infrared LEDs, No IR, the images were dark.

To solve this problem, you have to shorten the Ethernet cable distance.

Please note a regular PoE switch or NVR meet the IEEE802.2af standard, which only offers 15.4W power supply.

Reference information:
http://www.hkvstar.com/technology-news/general-problems-and-solution-for-ip-cameras.html
http://www.hkvstar.com/technology-news/guidance-for-power-consumption-for-poe-device.html
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