Powering cameras from mikrotik switch

RouterOS General
1

Hi,
I am a bit confused with all that PoE standards, so I would appreciate some help.

I have ethernet cable which is plugged into Linksys LGS116P switch at home and it is powering IP camera mounted outside, everything works well and this is clear.
Now I want to mount second camera in same place where first is. but without using another ethernet cable. My idea was to unplug ethernet at home from Linksys, plug it to some PoE injector, on outside mount HEX POE and plug both cameras to HEX POE and power it from this injector. Will it work?

Cameras are Hikvision PoE 12V 802.3af. I see that HEX POE has 802.3af/at standard on output, but I am unable to find if powering method of HEX POE matters in this case? Do I need to power it via DC input to get 802.3af/at on output or can I power it via PoE injector. If yes then what injector do I need? 48V to match 802.3af/at standards or 12V will be enough?

Or maybe there is cheaper solution to get two cameras powered via one ethernet cable? Any suggestions?
I could buy RB260GSP, power it by 12V PoE injector, but I am not sure if that 12V passed further as passive PoE will power cameras properly?

2

All the standards require nominal voltage of 48 V; non-standard PoE variants use lower voltage and are simpler (= cheaper) to implement.


Yes, but only if you power the hEX PoE with a 48 V power supply which has to be obtained separately - the one bundled with hEX PoE is a 24 V one. There is no DC-DC converter inside hEX PoE.

The 12 V on the camera refer to the power plug input; the 802.3 af/at has to be a 48 V one. So you could also use passive PoE splitters to extract the DC power from the 4,5 and 7,8 pairs of the Ethernet cable at the camera end, but in that case you’d have to feed the hEX PoE by a 12 V power supply.

3

Ok, so in order to maintain 802.3 af/at on Eth2-5 of hEX I need to fed it with 48V, thats clear.
Can I do it with PoE injector+48V supply via ethernet cable? Or it needs to come through DC input?

Is this solution a good practice or I should go with different approach?

4

Yes, you can.


Provided that all the power limits are met, it is the intended use of hEX PoE.