Power over Ethernet (PoE) for boats – Simple, safe, and cost-effective installation

Learn how PoE technology simplifies marine network installations by combining power and data in one cable. Discover the benefits of the OneNet standard and why Cat5e is the minimum requirement.

Power over Ethernet (PoE) has become increasingly popular among boat owners due to its reliability and flexibility. The technology allows both power and data to be transmitted via the same network cable, eliminating the need for separate power cables. This simplifies installation and reduces costs.

How does PoE work?

PoE uses the existing 8 wires (4 pairs) in a standard Cat5e cable to transmit both data and power. Depending on the method, power and data can be sent over the same pair or separated. The new OneNet standard supports PoE, which means that more marine installations will use this technology in the future.

Standards and methods

PoE is standardized according to IEEE 802.3 and uses three methods:

• Option A: Power and data over the same pair (10/100 Mbit).
• Option B: Power over spare pairs not used for data.
• 4PPoE: All four pairs are used for both data and power, enabling higher speeds and power.

Advantages of PoE on boats

• Network expansion: Easy expansion with PoE switches and injectors.
• Flexible installations: Place devices anywhere without the limitation of power outlets.
• Time and cost savings: Fewer cables reduce installation time and cost.
• Safe and reliable: PoE technology is intelligent and adapts power supply to the device's needs.

OneNet and PoE

The OneNet standard is based on IEEE 802.3 and supports PoE+ with up to 25.5 W of power. For best performance, at least Cat5e cable is required, but Cat6 and higher are recommended for higher speeds and stability.

PoE is the future of marine networks – it provides simpler installations, reduced costs, and increased safety on board.