Can PoE splitters be used in combination with PoE extenders?
Feb 15, 2025
Yes, PoE splitters can be used in combination with PoE extenders, and this can be particularly useful in scenarios where you need to extend the reach of your PoE-enabled devices beyond the standard Ethernet cable length limit of 100 meters (328 feet). Here’s a detailed explanation of how PoE splitters and PoE extenders can work together and why this setup can be beneficial.
What is a PoE Extender?
A PoE extender (also called a PoE repeater or PoE injector) is a device designed to extend the range of a PoE-enabled network connection. It amplifies the power and data signal sent over the Ethernet cable, enabling the PoE signal to travel further than the typical 100-meter distance limit of standard Ethernet cables.
How PoE Extenders Work:
--- PoE extenders typically work by repeating the Ethernet signal and regenerating the power (as well as the data signal) for longer distances.
They typically come in two forms:
--- Mid-span extenders: These are placed in-line with the Ethernet cable, between the PoE switch/injector and the powered device (such as an IP camera, wireless access point, etc.).
--- End-span extenders: These are positioned at the far end of the Ethernet cable, where the signal is weak, and they regenerate both power and data to the device.
--- PoE extenders are useful when the distance between your PoE power source (such as a PoE switch or injector) and the device exceeds the standard 100 meters. They can extend the PoE signal to distances of up to 200 meters or more, depending on the specific model.
What is a PoE Splitter?
A PoE splitter is used to split the combined power and data signal from a PoE-enabled Ethernet cable into separate outputs:
--- Data (Ethernet): The original Ethernet connection that provides the network communication.
--- Power: A DC output (e.g., 5V, 9V, 12V, or 24V) to power a non-PoE device that requires a different voltage than the standard 48V typically used for PoE.
--- PoE splitters are used to power devices that do not natively support PoE but can benefit from receiving power over Ethernet for easier installation, particularly when running an additional power cable is impractical.
How PoE Splitters and PoE Extenders Work Together:
When used in combination, PoE splitters and PoE extenders can provide both extended reach and the necessary power to non-PoE devices. Here’s how they can work together in a typical setup:
1. PoE Source:
--- A PoE-enabled switch or injector sends both power and data over an Ethernet cable.
2. PoE Extender:
--- The Ethernet cable length exceeds 100 meters, so you use a PoE extender to boost the signal. The extender amplifies both the data signal and the PoE power, allowing it to travel over a longer distance (e.g., up to 200 meters).
3. PoE Splitter at the End Device:
--- After the extended distance, the Ethernet cable reaches the device requiring PoE power. If the device does not natively support PoE (e.g., an IP camera or a wireless access point), a PoE splitter is used.
--- The PoE splitter takes the combined power and data signal, splits the power into a lower voltage (such as 5V, 12V, or 24V), and sends the data to the device, effectively powering and networking the non-PoE device.
Advantages of Combining PoE Splitters and PoE Extenders:
1. Extended Reach for PoE Devices:
--- PoE extenders allow you to overcome the 100-meter limit on standard Ethernet cables. This is crucial in large buildings, outdoor installations, or areas where running multiple cables is impractical or too costly.
--- By combining an extender with a splitter, you can reach remote locations and still power devices that require different voltage levels (e.g., 5V, 12V).
2. Simplified Installation:
--- PoE extenders can deliver power and data over longer distances, which reduces the need to run additional power cables or face the limitations of distance. This simplifies installations, especially in environments where it's difficult to bring in separate power supplies.
--- The PoE splitter allows you to use a single Ethernet cable for both data and power, even for non-PoE devices that require specific voltages.
3. Cost-Effective Solution:
--- Combining PoE extenders with splitters can save you the cost and effort of installing additional power outlets or running long power cables, which is especially useful in buildings, outdoor installations, or places with hard-to-reach power sources.
4. Increased Flexibility:
--- You can use the same network infrastructure (Ethernet cables) for both data and power, which gives you flexibility in where and how you place devices, even if they are far from the original PoE source.
--- PoE splitters allow you to power a wide range of non-PoE devices (such as wireless access points, IP cameras, or sensors) while still benefiting from the extended range offered by PoE extenders.
Considerations When Using PoE Splitters and PoE Extenders Together:
1. Power Requirements:
Ensure that the PoE extender can provide sufficient power for the devices you are powering. Extenders generally support the same power delivery as the source (either PoE or PoE+), but if you're using PoE++ (up to 60W or 100W), ensure that the extender can handle this higher power level.
The PoE splitter will need to be matched to the power needs of your device (5V, 9V, 12V, etc.). For example, if you’re using a PoE+ extender, ensure that the splitter can handle the 25.5W of power that might be delivered.
2. Cable Quality:
--- To ensure the best performance, use high-quality Ethernet cables (preferably Cat5e or Cat6). Poor quality cables can lead to signal degradation over long distances, which could affect both power delivery and data transmission.
--- For higher-power PoE applications, Cat6 or Cat6a cables are recommended, as they have better shielding and higher bandwidth capabilities.
3. PoE Standard Compatibility:
--- Ensure the PoE extender and the PoE splitter are compatible with the same PoE standard (e.g., IEEE 802.3af, 802.3at, or 802.3bt). Using incompatible devices may result in power loss or device malfunction.
4. Power Loss in Extenders:
--- While PoE extenders do regenerate the power, some power loss may occur due to the distance and the regeneration process. Make sure the extended power is still sufficient to meet the needs of the device being powered.
In Conclusion:
PoE splitters can indeed be used in combination with PoE extenders to extend the range and power capability of your PoE setup. The extender helps you extend the Ethernet cable’s reach beyond 100 meters, while the splitter enables you to power non-PoE devices with the PoE power being transmitted over the extended cable. This combination is ideal for large installations, outdoor setups, or situations where devices with different voltage requirements need to be powered over long distances. Just ensure that the power needs of your devices and the capabilities of the extenders and splitters are compatible.
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