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With remote powering, network-capable devices may be provided with power and data services via a single Ethernet cable. When choosing components, the question of the right standard inevitably arises. There are Power over Ethernet (PoE), Power over HDBaseT (POH) and, in the future, Power over Dataline (PoDL) to choose from. The decision also depends on the area of application.
We will introduce you to the 3 standards and explain the advantages and differences. Using application examples for smart home, multimedia and industrial automation, we show you what is important and select the right product for you.
With Power over Ethernet (PoE), devices with network capability can be supplied with data services and power simultaneously via a single cable. A separate power supply unit is not necessary. Power is supplied exclusively via the RJ45 interface. The maximum defined transmission distance is 100m. Since the adoption of the first standard in 2003 (802.3af), PoE has undergone rapid development.
With the latest standard 4 Pair Power over Ethernet (4PPoE, 802.3bt), up to 90W power is possible. This makes PoE interesting for energy-intensive end devices such as notebooks, televisions or computers. When integrating 4PPoE (4 Pair PoE), there are a few things to consider. We provide valuable practical tips in our free whitepaper.
Power over HDBaseT (POH) is part of the HDBaseT™ technology, which provides five different functions over one network cable. The so-called 5Play™ includes the transmission of video, audio, Ethernet, control signals and power. The audio and video data can be transmitted uncompressed in Full HD (2K) or Ultra HD (4K) resolution.
POH is a standard based on PoE. Therefore, both standards also share a large part of the components used. Like 4PPoE, all 4 wire pairs of the copper cable are used for power transmission. The maximum defined distance is also 100m.
Power over Dataline (PoDL) refers to the standard for power supply via Single Pair Ethernet (SPE). As the name suggests, SPE technology uses only one pair of wires, which saves space and weight and allows a significantly higher packing density. Despite this reduction, a power supply of up to 60W is possible. At the same time, longer transmission distances of up to 1,000m can be realised at transmission rates of 10 Mbps.
As a member of the SPE System Alliance, EFB-Elektronik is committed to the further promotion of SPE technology (learn more).
In a smart home, a wide range of devices communicate with each other. Lighting, blinds, music systems or access systems are networked and can be controlled centrally. In addition, sensors detect environmental signals and forward the information to other devices. For example, a sensor registers that the windows are open. The heating is then turned down.
This not only increases the number of devices (e.g. sensors), but also the amount of network-capable devices that previously had no data communication. To supply all of them with power and data, Power over Ethernet (PoE) is a practical and cost-effective solution. This is because the energy consumers (powered devices) only have to be connected with a single connection cable. This allows the total cabling in the entire house to be significantly reduced, as fewer electrical connections are also necessary. This saves costs.
The latest 4 Pair Power over Ethernet (4PPoE) standard with a power of up to 90W allows energy-intensive powered devices such as smart TVs and computers to be connected.
PoE splitters enable a power supply for network devices that are not PoE-capable. For example, access points or network cameras can be supplied with power and data services via a single Ethernet cable. For this purpose, the PoE splitter has two output cables on the back that transmit power and data separately. The use of PoE splitters is particularly suitable in situations where non-PoE devices shall be used and no power outlet is within reach.
Everyone has probably encountered large screens with media content in hotels, supermarkets, shopping malls or at airports. The challenge for cabling here is the transmission of high-resolution multimedia signals over long distances. HDMI cables quickly reach their limits here.
The solution: Two HDBaseT extenders extend the 4K video signal by up to 100m using an Ethernet cable that connects both devices. Only one device requires a power supply. The partner device is supplied with power via POH. Then the output screen can be connected with an HDMI cable.
In industrial network technology, reliability and a high level of electrical noise immunity are particularly important. The devices must safely withstand environmental influences such as dust, temperature fluctuations and vibrations. This also applies to the power supply.
The use of remote powering offers the advantage of being able to build on the existing network infrastructure. Powered devices are supplied with power via the existing structured cabling. In addition to the classic devices (telephone systems, wireless AP, etc.), numerous new network-compatible components (e.g. sensors, IP cameras, access systems) are being added in the context of industrial automation. In this case, industrial remote powering can be easily scaled up. Additional electrical connections and cabling are not necessary. This not only saves costs but also space, which can be crucial in confined environments.
With Power over Ethernet, smart lighting management can be set up. Not only is the power supply ensured via the Ethernet cable, but also control commands such as switching on and off and dimming. This enables central control of the lighting through the network. Especially in larger building complexes, this is a decisive advantage. In addition to more convenient operation, valuable energy can also be saved.