Crummy POE switch?

Jon Kovach · Dec 10, 2018

Hi all,

I have a Dahua SD49225T on a PoE injector - an iCREATin.

For some reason, periodically, my camera loses connection to Blue Iris. I have to unplug the PoE (I can't reach the camera easily) and plug it back in. The camera comes back after that.

Is this a bad camera? A bad PoE?

Help! Thanks,
Jon

Q™ · Dec 10, 2018

Have a read of this @Jon Kovach...

SD49225T-HN frequent restarts

SouthernYankee · Dec 10, 2018

Start by getting a quality POE switch. I have not had much success with an injector. If it is the sub $10 icreatin passive POE injector, you get what you pay for. STOP buying crap.

Jon Kovach · Dec 10, 2018

SouthernYankee said:
Start by getting a quality POE switch. I have not had much success with an injector. If it is the sub $10 icreatin passive POE injector, you get what you pay for. STOP buying crap.

HAPPILY WILL DO! Can you recommend a GOOD, reliable PoE to use?

Cameraguy · Dec 10, 2018

Jon Kovach said:
HAPPILY WILL DO! Can you recommend a GOOD, reliable PoE to use?

BV-Tech 9 Port PoE+ Switch (8 PoE+ Ports | 1 Uplink Port) – 120W – 802.3af/at https://www.amazon.com/dp/B005GAATOG/ref=cm_sw_r_cp_apa_i_1NRdCb993GG6A
Just got this and its sweet

Q™ · Dec 10, 2018

Cameraguy said:
BV-Tech 9 Port PoE+ Switch (8 PoE+ Ports | 1 Uplink Port) – 120W – 802.3af/

I have two (2) of those and they appear to work well at this point in time. But I also have three (3) of these smaller BV-Tech switches which have fewer ports and cost less but provide the same PoE+ 802.3at power...

https://www.amazon.com/gp/product/B01ES1OVY2

Jon Kovach · Dec 10, 2018

Q™ said:
Have a read of this @Jon Kovach...

SD49225T-HN frequent restarts

So I didn't totally understand this thread. Is this saying that the Dahua cameras all have this glitch??
Or do I just need a new PoE switch?
Jon

Q™ · Dec 10, 2018

Jon Kovach said:
Is this saying that the Dahua cameras all have this glitch

Apparently, some SD49225T-HN have this issue, and some don't. But to eliminate causes, start by getting a decent POE+ switch.

Edited to make my post clearer...thank you @fenderman

fenderman · Dec 10, 2018

Q™ said:
Apparently, some do and some don't. But to eliminate causes, start by getting a decent POE+ switch.

to clarify, some SD49225T-HN have this issue. not some dahuas in general as they are rock solid.

Jon Kovach · Dec 10, 2018

PERFECT. Thanks guys. Thanks very much. I bought the switch, and have my fingers cross that this will fix it.
Jon

fenderman · Dec 10, 2018

Jon Kovach said:
PERFECT. Thanks guys. Thanks very much. I bought the switch, and have my fingers cross that this will fix it.
Jon

another consideration is the cable and crimp. A cheap CCA/copper clad aluminium cable or a bad crimp can cause this as well. Also ensure you are using the 568 standard to crimp. If you can test with a store bought cable on the bench that would be ideal.

Frankenscript · Dec 10, 2018

fenderman said:
another consideration is the cable and crimp. A cheap CCA/copper clad aluminium cable or a bad crimp can cause this as well. Also ensure you are using the 568 standard to crimp. If you can test with a store bought cable on the bench that would be ideal.

To reinforce @fenderman 's comment, I had an issue with one of my cameras near the garage giving periodic loss of connection issues. Eventually I found out it was loosing connection about 1 time out of 5 that the garage door went up or down. I clipped off the connector, re-terminated it, and all was well. Final diagnosis was my somewhat amateurish crimping skills gave me a spotty connection that was disturbed by vibration.

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Crummy POE switch?

Jon Kovach

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SouthernYankee

Jon Kovach

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Cameraguy

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Jon Kovach

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Jon Kovach

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Frankenscript

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