cgcmgr 0 Posted April 3, 2012 Hi Guys, I was wondering if you could answer a question for me. I have an IP PTZ camera that is NOT PoE capable. I will end up using an Axis Midspan or some sort of PoE injector to a PoE splitter to connect the camera. My question is this. I have seen some High Powered PoE Midspans such as the Axis T8121 High Power PoE Midspan 1-Port 5014-004. It has this spec. 55 V DC (max. 30 W). My camera runs on the basic 12V power adapter. Can I use this Axis Midspan so long as I use a 12V splitter? What is the advantage of the High Powered PoE Midspan? Does it allow for further power travel? Will the 55 V Dc harm my camera? Thanks, Chris Share this post Link to post Share on other sites
camera-newbie 0 Posted April 3, 2012 If you're thinking of powering your 12VDC camera from 55VDC, I would not do it -- I'm sure you'll fry the voltage regulator in the camera at the very least. I'm not sure why you're thinking of using a PoE injector if you have no camera that can use it -- ? Are you just looking for a power-supply that can get your 12vdc to the camera? Share this post Link to post Share on other sites
cgcmgr 0 Posted April 4, 2012 If you're thinking of powering your 12VDC camera from 55VDC, I would not do it -- I'm sure you'll fry the voltage regulator in the camera at the very least. I'm not sure why you're thinking of using a PoE injector if you have no camera that can use it -- ? Are you just looking for a power-supply that can get your 12vdc to the camera? Basically yes. If I don't use a PoE Injector, how would I get power and data over a Cat-6 cable? Share this post Link to post Share on other sites
Horizon 0 Posted April 4, 2012 Cgcmgr, I think you should be fine. Check that the splitter has an internal dc-dc converter, which will change the 55V POE down to 12V for your camera. It should be stated somewhere in the sales blurb. Share this post Link to post Share on other sites
cgcmgr 0 Posted April 4, 2012 Cgcmgr, I think you should be fine. Check that the splitter has an internal dc-dc converter, which will change the 55V POE down to 12V for your camera. It should be stated somewhere in the sales blurb. Thanks! Share this post Link to post Share on other sites
cgcmgr 0 Posted April 4, 2012 Cgcmgr, I think you should be fine. Check that the splitter has an internal dc-dc converter, which will change the 55V POE down to 12V for your camera. It should be stated somewhere in the sales blurb. I'm looking at the Axis T8126 PoE Splitter. Although I don't see it say DC-DCconvertor, it does say, "* Products powered directly by IEEE 802.3af midspans (15W) may also be powered by IEEE 802.3at midspans (30W or 60W). Even though a High PoE midspan can supply higher power, it will not supply more power than required by the powered device." Do you think that means I could use it with a midspan giving 55V? Chris Share this post Link to post Share on other sites
fa chris 0 Posted April 4, 2012 Cgcmgr, I think you should be fine. Check that the splitter has an internal dc-dc converter, which will change the 55V POE down to 12V for your camera. It should be stated somewhere in the sales blurb. I'm looking at the Axis T8126 PoE Splitter. Although I don't see it say DC-DCconvertor, it does say, "* Products powered directly by IEEE 802.3af midspans (15W) may also be powered by IEEE 802.3at midspans (30W or 60W). Even though a High PoE midspan can supply higher power, it will not supply more power than required by the powered device." Do you think that means I could use it with a midspan giving 55V? Chris Yes. PoE is 48vdc (up to 55vdc I guess), if your camera is 12vdc then do NOT connect it directly to the 55vdc the Axis T8123 PoE injector is sending out over the cat5e, it will damage your camera, you need the Axis T8126 splitter to step it down from 48vdc to 12vdc. Watts are a completely different thing, the higher the number the more your power supply is able to provide but your camera will only consume what it needs, go with 30 watts if you can (check your camera spec sheet to see how many watts it requires, especially if it has a heater blower unit). So your power connection will look like this: 120-240vac --> Axis T8123 PoE injector --> cat5e/cat6/whatever cable --> Axis T8126 PoE Splitter --> 12vdc Camera. The above combination will provide ~24watts of power (or 2 amps at 12vdc) to your camera. This should be plenty for most cameras. These two Axis parts are made to play together. Share this post Link to post Share on other sites
cgcmgr 0 Posted April 4, 2012 Cgcmgr, I think you should be fine. Check that the splitter has an internal dc-dc converter, which will change the 55V POE down to 12V for your camera. It should be stated somewhere in the sales blurb. I'm looking at the Axis T8126 PoE Splitter. Although I don't see it say DC-DCconvertor, it does say, "* Products powered directly by IEEE 802.3af midspans (15W) may also be powered by IEEE 802.3at midspans (30W or 60W). Even though a High PoE midspan can supply higher power, it will not supply more power than required by the powered device." Do you think that means I could use it with a midspan giving 55V? Chris Yes. PoE is 48vdc (up to 55vdc I guess), if your camera is 12vdc then do NOT connect it directly to the 55vdc the Axis T8123 PoE injector is sending out over the cat5e, it will damage your camera, you need the Axis T8126 splitter to step it down from 48vdc to 12vdc. Watts are a completely different thing, the higher the number the more your power supply is able to provide but your camera will only consume what it needs, go with 30 watts if you can (check your camera spec sheet to see how many watts it requires, especially if it has a heater blower unit). So your power connection will look like this: 120-240vac --> Axis T8123 PoE injector --> cat5e/cat6/whatever cable --> Axis T8126 PoE Splitter --> 12vdc Camera. The above combination will provide ~24watts of power (or 2 amps at 12vdc) to your camera. This should be plenty for most cameras. These two Axis parts are made to play together. That's what I thought. I will be using the splitter, just wanted to know if it kicks down the voltage. Thanks for the help, Chris Share this post Link to post Share on other sites
MaxIcon 0 Posted April 4, 2012 If you have a POE source, I recently installed a TP-Link L-PoE10R for an older non-POE Vivotek IR dome that's been easy and inexpensive: http://www.newegg.com/Product/Product.aspx?Item=N82E16833997213&Tpk=poe10r This one takes a POE input and gives you a choice of 5V, 9V, or 12V DC output, and it's working fine after about 2 weeks. Installing it involved setting the switch to the right voltage and connecting the cables - it comes with short RJ45 and 2.1x5.1mm barrel power extenders. The POE switch I have feeding it shows that it uses 1W idle with nothing connected to it. Share this post Link to post Share on other sites
cgcmgr 0 Posted April 5, 2012 If you have a POE source, I recently installed a TP-Link L-PoE10R for an older non-POE Vivotek IR dome that's been easy and inexpensive:http://www.newegg.com/Product/Product.aspx?Item=N82E16833997213&Tpk=poe10r This one takes a POE input and gives you a choice of 5V, 9V, or 12V DC output, and it's working fine after about 2 weeks. Installing it involved setting the switch to the right voltage and connecting the cables - it comes with short RJ45 and 2.1x5.1mm barrel power extenders. The POE switch I have feeding it shows that it uses 1W idle with nothing connected to it. Thanks for the info....I'll look into it. Share this post Link to post Share on other sites
