Oh, and devolo also make one (1200MB) with a pass-through power plug but like all devolo products it's more expensive. Also it's only 802.3af so there could be a power issue again.

I don't know about "good" because I've never owned one but Solwise seem to be the only people making such a thing for sale in the UK. There are two models, one a 500MB homeplug model which complies with 802.3af (ie 15W power transfer) and a 1200MB model which complies with 802.3at (ie 25W). The latter is more expensive but the former would struggle with the 22W power requirement of the RLC-423. It depends on the camera you are installing and its power needs.

For what it's worth I recently installed an RLC-423 using homeplug. It was very remote from the router and the nominal speed of the connection is as a result a quite slow 55Mbit/s (the homeplug unit is nominally 500Mbit/s). However the camera works fine with a good picture and controlability.

For me, I am using POE Passive Injectors as attached. And they work fine over 20 meters length.

As I suspected, passive PoE works if you have a splitter at the camera end to extract DC power to feed into the camera's 12V input (as you have done). A PoE setup that conforms to the 502.3** standard does not need a splitter because the camera takes power directly from the ethernet plug.

There's a confusion here for us non-experts. The RLC-423 spec on Reolink's website says its consumption is 22W. It also says it takes 12V (which it certainly does if you connect the power separately via its power lead). It also says its PoE complies with 802.3at which is an industry standard that specifies 48V supplying up to 25.5W. I assume that since the RLC-423 complies with 802.3at it is capable of taking 48V through the ethernet cable and deploying it as 12V internally.

What is at doubt is whether my injector is 802.3at compliant. The standard requires the units to have the ability to negotiate with each other and establish suitable power levels, auto cut out for overloads (so the ethernet cable doesn't fry) etc. It turns out there are a lot of cheap PoE injectors on the market that don't do this (often sold as "passive" PoE injectors) and typically will need a splitter at the far end to extract a DC voltage. I suspect my injector is dumb and because it's not "talking" to the camera,  the camera is not responding.

As it happens, my camera is located where it is easy to supply power via the 12V DC connection. However, I am considering a second unit on the other side of the house where mains AC will be remote and a PoE solution pretty much required so I'll have to think very carefully about what injector to get. Clearly it is important to get one which is explicitly 802.3at compliant since anything else (including a 802.3af unit which only supplies up to 15.4W) is not up to the job.

I got the feeling that the supplied output current is insufficient to your ipc.

0.5A @ 48V is 24W which is the present PoE standard (used to be 15W according to Wikipedia) so what is the RLC-423's power requirement?

The data label says output is 48V - 0.5A and a little picture shows it is using pins 4,5,7 and 8. Any idea which pins the camera uses? I understand there are two standards; one uses these pins and the other uses 1,2,3 and 6.

I've now checked all the ethernet connections and I am getting 49VDC on the ethernet plug which connects with the wire coming out of the camera so it would seem there is nothing wrong with with the PoE supply.

It shows up in the DHCP list when I'm using the 12V supply but shows as "disconnected" when set up for PoE. When 12V power is switched on the camera goes through an initialization (rotates, spins etc) but nothing happens with PoE. The injector is brand new so it should be working hence my query about voltage. Should I be injecting 12V using a dumb injector plus the supplied power supply? Is there a way to test the injector's output?

If you ping the IP address of the camera when you plug it into this PoE injector, what’s the result?

100% packet loss, unreachable. Is it correct to be injecting 48V when the power in plug is 12V?

I just got a rlc-423 and set it up. I can get it to work very well using the supplied 12v DC input but when I try using Poe nothing happens. I'm using a " PIXNOR DC 48V 0.5A POE Injector Power Supply Over Ethernet Adapter with UK Plug for 12V 24V 48V POE Device" from Amazon which plugs in directly to a mains supply socket and it appears to be working (led lit) but the camera doesn't respond. Any ideas?