Powering
The device accepts power in the following ways:
- direct-input power jacks J1/J2 (5.5mm outside and 2mm inside diameter, female, pin positive plug) both accept 10-57V DC.
- Ether1 Ethernet port accepts 12-57V DC input (at the board; higher voltage needed to compensate for power loss on long cables) from 802.3af/at or passive Power over Ethernet sources.
Max total power consumption with all interfaces loaded is
5 W. You can use any or all inputs at the same time, they will work in failover mode.
Extension slots and ports
- The first Ethernet port accepts 8-30V DC powering from a passive PoE injector or 802.3af/at PoE switch. Use 12V or more to compensate for any losses in cables.
The other four Ethernet ports do not support PoE input.
- The Ether5 port is capable of powering another RouterBOARD device with passive PoE (up to 57 V). The maximum output current is 500 mA.
Passive PoE-Out up to 57 V - Works same as low voltage (up to 30 V) PoE-Out, but is also capable to deliver high voltage over PoE ports. The output voltage depends from the power source connected to PSE. Can power up af/at compatible devices, which accepts power over 4,5 (+) and 7,8 (-), and does not require PoE negotiation. PD resistance on spare pairs should have range from 3kΩ to 26.5kΩ. (e.g. cAP ac, hAP ac, wsAP ac lite.)
[*] From Quick guide and Wiki
https://i.mt.lv/cdn/rb_files/1536013562RB450Gx4-qg.pdf
https://wiki.mikrotik.com/wiki/Manual:PoE-Out