I ended up buying 3 more from Ebay. Now I need to buy more good cameras... Linovision PoE Extender Passive 2 Port 802.3af/at, FREE SHIPPING | eBay
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Two POE Cams Over One Ethernet Cable
- Thread starter rfj
- Start date
I ended up buying 3 more from Ebay. Now I need to buy more good cameras... Linovision PoE Extender Passive 2 Port 802.3af/at, FREE SHIPPING | eBay
I think I'd call that an active extender, or better yet call it what it really is, a 2-port poe-powered switch.
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In most instances, the NVR will only accept one camera per POE port. But give it a try as some have had success doing it with this splitter. But some haven't. Seems to be hit or miss. It works for my neighbor.
Not sure how I missed this thread but thanks to all that have contributed. This will save me much blood, sweat, and tears running more cables in my attic.
Do you all think the splitter from Nellysecurity would be better suited to handle higher temperatures of a detached garage or attic?
Do you all think the splitter from Nellysecurity would be better suited to handle higher temperatures of a detached garage or attic?
Depends!!! I am no expert in this at all but I suspect that on the outside those Nellysecurity switches are probably just switching the path of connectors, i.e. no chips are involved. If that is true, then they should be less affected by hot or cold temperatures (humidity is a different story). For something like the LinoVision the temperature is -30 - 65 degrees Celsius at the usual 10-90% humidity . See here on page 2
I am preferring the LinoVision despite the fact that I struggle a bit to put them into a junction box but I don't like the fact that the other solution is either taking up two PoE ports (or maybe you can get away with a PoE injector which is more equipment 'hanging' around).
Thinking about it, why does the solution with the cable splitter require two PoE ports? The signal from the two cameras is transferred over just 8 conductors. So why do they have to be taken apart? The solution that requires only one PoE port can do it. I guess some kind of processing must be happening. And how does the switch know anyways that there are two cams on one port?
The one that I linked that only needs one POE port has some processing inside and pulls a little power from the POE to run it.
The cable that requires two ports does not have that processing. For kicks I tried it without plugging it into the 2nd POE and the camera didn't work.
Thanks, and you were able to fit this into a junction box without bending the Ethernet cables too much (as they need to go through that hole in the middle)? I think I found one that might work physically for my Dahua and HikVision cams.
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The splitter solution is the electrical equivalent of running 2 separate ethernet cables for non-gigabit connections. 2 separate cables would of course use 2 POE ports. There are 2 separate data streams from the cameras to the POE switch. The one port solution is actually an ethernet switch that combines the data from 2 cameras into a single data stream, which can then be connected to a single POE port. So yes, processing is happening.
How did you do that? I did go to home depot today and bought some 4" ABS pipe. It's about 4mm 1/6" too wide (you can see the rim in box2.png). I would also have to create some adaptor plate for the top so I can secure the camera and another adaptor plate at the bottom so I can mount the thing to the wall.
Attachments
It was a box - something like this from Home Depot and then I screwed the camera into this top.
You may already know this, but the step drill bits (ie, "UniBit") work great with PVC, ABS, polycarbonate, etc. I recommend first drilling a small pilot hole with a conventional drill bit.
I ordered one of these (~5$):
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I checked it today (for a minute) on the NVR end (to avoid remounting the IPCs), seems to work fine with two Dahua IPCs (2431TM-AS-S2 && 5442-ZE).
Works like this:
Eventually, when splitting one cable into two, the NVR end will have two male cables (which is good for us, with regards to IP and POE).
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Works like this:
Eventually, when splitting one cable into two, the NVR end will have two male cables (which is good for us, with regards to IP and POE).
If I test a Lorex NVR for which pairs are carrying power, I should be able to make my own adaptors, correct ?
I've used this with great success:
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Not having a built-in POE switch in my NVR I should be careful about assumptions, so I'll say I'd expect that the NVR would use POE mode A, with the blue an brown pairs unused. I've made my own adapters, and also used purchased adapters. The purchased ones look better as the ones I make have a keystone jack hanging on 4 loose wires.