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 Post subject: Troubleshooting Short term DC on PoE cameras.
PostPosted: Thu Aug 24, 2017 5:40 am 
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Joined: Aug 2017
Posts: 2


Hell of a first post incoming.

I have total 7 PoE cameras installed in a manufacturing facility.
Since i had no experience, i did the best i could while designing the system.
I have one camera per PoE switch -> data switch -> PC/Server (Scheme added)
I got the system up and working only this way when there were no cameras connected to "Data switch" hence the reason calling it data.
So i have an issue where 4 of the cameras are unstable (right side data switch( cabling marked with "?")) Long loading times, connection drops, latency etc.
No cable (Cat5e) should be longer than 100m/330ft.
Power is supplied from single wall socket to whole system.
Switches are 40W maximum output supporting IEEE802.3at, af. 10/100Mbps (up to 150meters)
Most powerful/biggest camera max 20W usage.
Usually when one camera drops connection, all 4 go down from that side. 5 seconds to couple of minutes. Usually couple of seconds.
If it was power requirement, all 7 cameras would drop, same with bandwith limit i guess.
The connection drops usually occur when i try to access camera via ip or simply trying to PTZ.

I've been thinking about:
New/secondary cable from data to data swith as it's been patched couple of times. (Rats bigger than cats, video on request)
An PCI-e networking card specifically for cameras?
Gigabit data switch
Eliminating link between two data switches and bringing two cables to server from each data switch.

Any suggestions, troubleshooting/testing ideas welcome.

Best Regards,

PS! There is a router between pc and data switch. Also i have few empty leads for future cameras.

Edit// 2 of the cameras on connection drop side are 1080p (one PTZ) and 2 704x576px (both PTZ)

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 Post subject: Re: Troubleshooting Short term DC on PoE cameras.
PostPosted: Tue Sep 05, 2017 6:11 am 
Registered User

Joined: Aug 2017
Posts: 2

Another anomaly I discovered:
When I am locally connected directly to the camera via ip, and I have a remote client connected over mobile internet -
Remote client always sees movement/picture update first. Local image can freeze for minutes while remote client has no issues. (Unless connection drops)
The internet connection is mobile/no cable.

I use Axis cameras and Milestone VMS

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