What is passive PoE?
The MRU Compact uses a standard RJ45 ethernet cable where power is supplied through Passive PoE (Power over Ethernet). In most cases you cannot connect the MRU directly to a an ethernet switch with PoE, since most of these are Active PoE.
We normally supply your first MRU Compact with a start kit containing a POE RJ45 spliter socket. You will only need standard RJ45 cat5 ethernet cables to connect the MRU to the spliter socket and the spliter socket to your PC or ethernet switch.
For industrial installations, we recommend to either terminate one end of the ethernet cable on a terminal block or use an interface module like this from Wago
If you want to connect the MRU Compact directly to a Active PoE switch, you can use a PoE converter. This device converts the power from the active PoE switch to constant 24 V passive PoE. An example of these is this PoE converter from Ubiquity
The MRU Compact uses passive PoE with a voltage between 9 and 36 V.
Please refer to the MRU Compact user manual for more information.
Related products
Usage area
IP 65
Connectors
RJ45 or RJ50
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Further reading
Advanced motion compensation for sonars introduced at Ocean Business 2025
Research Project to Test Value of MRU Data for Vessel Performance and Carbon Reduction
Reference frames and notations for Norwegian Subsea MRUs
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