Manual:PoE-Out
Summary
this page describes ow poe-out feature can be used on RB750UP and OmniTik UPA. These boards have 100MBps interface and power is provided over the spare pairs.
Configuration
PoE Out feature can be configured for ethernet interfaces as that is an attribute of the ethernet interface that has the feature.
Power on 100MBps interface is provided over spare pairs (blue and brown) where blue pair carries positive and brown - negative.
Each port can be controlled independently.
Configuration options are:
- auto-on - board will attempt to detect if power can be applied on the port. For power-on to happen there should be resistance on spare pairs in range from 3kΩ to 26.5kΩ. It is the default setting;
- forced-on - detection range is removed. As a result power over Ethernet will be turned on the port;
- off - all detection and power is turned off for this port.
How it works
auto-on mode
If auto-on is selected then port operates in this strict order:
- with low voltage it checks for resistance on the connected port. If it is detected that resistance is in range (3kΩ to 26.5kΩ) power is turned on the interface;
- when power is given it is continuously checked if overload limit is not reached or short circuit is detected
- when cable is unplugged port returns in detection state and will remain off until suitable port that could accept PoE is detected
forced-on mode
If forced-on is selected then port operates in this strict order:
- it is checked if resistance is in range is 0Ω to ∞Ω, so that even if cable is unplugged power will be given on the port
- when power is given it is continuously checked if overload limit is not reached or short circuit is detected
- when cable is unplugged port remains with power enabled on the port
Safety
This feature on PoE out capable devices have these safety features
Overload protection
when port is on (PoE out is enabled) port is checked for overload, If that is detected to avoid hardware damage of powered device or powering device PoE out is turned of on this port
Short circuit detection
when port is on (PoE out is enabled) port is checked for short circuit. If it is detected to ensure that there is no additional damage on powered device and no damage on powering device PoE out is turned off on all ports
PoE Out polarity
By default PoE out polarity on MikroTik manufactured devices on 100MBps ports is standard
Standard
PoE out on RouterBOARD devices is standard - over blue pair - positive and over brown pair - negative voltage
Reversed
Some devices use different polarity to power their devices that is reverse of the standard: over blue pair - negative and over brown pair - positive voltage
Any
Device that supports either of 2 possible polarities - either standard or reversed
Wiring
If you want to power device that supports only reverse polarity using 'RB750UP and OmniTik UPA you have to make special cable that will swap required wires, thus enabling you to power these devices.
On one end you have to have standard RJ45 T568B wiring (orange striped, orange, green striped, blue, blue striped, green, brown striped, brown) and on other and has to have blue and brown pair swapped resulting in (orange striped, orange, green striped, brown, brown striped, green, blue striped, blue)
RB750UP and OmniTik UPA-5HnD Powered devices
Table contain information on what devices can be powered using RB750UP and OmniTik UPA-5HnD as power source for PoE
Polarity: standard - blue pair positive, brown pair negative; reversed - blue pair negative , brown pair positive, any - either standard or reversed.
| Device | forced-on | auto-on | polarity |
|---|---|---|---|
| RouterBOARD RB433GL [1] | yes | yes | any |
| RouterBOARD RB450G [2] | yes | yes | any |
| OmniTik UPA-5HnD [3] | yes | yes | standard |
| OmniTik U-5HnD [4] | yes | yes | standard |
| RouterBOARD RB711G-5HnD [5] | yes | yes | any |
| RouterBOARD RB800 [6] | no | no | any |
| RouterBOARD RB450 [7] | yes | yes | standard |
| RouterBOARD RB433AH [8] | yes | yes | standard |
| RouterBOARD RB750 [9] | yes | yes | standard |
| RouterBOARD RB750UP [10] | yes | yes | standard |
| RouterBOARD RB435G [11] | yes | yes | any |
| RouterBOARD RB493AH [12] | yes | yes | standard |
| RouterBOARD RB493 [13] | yes | yes | standard |
| RouterBOARD RB532 | yes | yes | standard |
| RouterBOARD RB153 | yes | yes | standard |
| RouterBOARD RB112 | yes | yes | standard |
| Motorolla Canopy | yes | yes | reversed |
| Ubiquity LOCO900 | yes | yes | standard |
| Ubiquity Bullet M2 | yes | yes | standard |
| Ubiquity Bullet M5 | yes | yes | standard |
| Ubiquity NanoStation 2N | yes | yes | standard |
| Ubiquity NanoStation M365 | yes | yes | standard |
| Ubiquity UniFi AP | yes | yes | standard |
| Ubiquity UniFi AP long range | yes | yes | standard |