Power over Ethernet

What is PoE?

PoE stands for "Power over Ethernet." It is a technology that allows electrical power to be transmitted over Ethernet cables, typically Cat 5e or Cat 6 cables, alongside data signals. This means that devices can receive both power and network connectivity through a single Ethernet cable, eliminating the need for separate power cables.

PoE is commonly used to power various networked devices, including IP cameras, wireless access points, VoIP phones, network switches, and other Internet of Things (IoT) devices. It simplifies the installation and setup of these devices, especially in locations where access to power outlets may be limited or inconvenient.

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What's the differerence between IEEE 802.3af and IEEE 802.3at?

The original PoE standard, known as IEEE 802.3af, provides up to 15.4 watts of power per port. There is also an enhanced version called PoE+ (IEEE 802.3at), which can deliver up to 30 watts of power per port, making it suitable for devices with higher power requirements.

How can I use PoE to power a tablet or iPad?

To power your tablet or iPad you need the following equipment:

  1. PoE Injector or Switch
    You will need a PoE injector or PoE switch. These devices provide power to your tablet through the Ethernet cable. PoE injectors can be used individually, while PoE switches have multiple PoE ports and can power multiple devices simultaneously.

  2. PoE Splitter or Adapter
    Since tablets and iPads don't have PoE-compatible Ethenet ports, you'll need a PoE splitter or adapter. This device separates the data and power from the Ethernet cable, allowing you to connect it to your tablet's charging port. The PoE Splitter must off-course be equiped with a USB port to connect a Lightning or USB-C cable.
    Some PoE Splitters only provider power while others provide power and data, enabling a cabled network connection for your tablet. This is particularaly interesting if you don't want to rely on a Wi-Fi signal.

  3. Ethernet Cable
    Use a standard Ethernet cable (Cat 5e or Cat 6) to connect your PoE  Injector or PoE Switch to the PoE Spliter. In most setups you can use a cable up-to 100 meters in length.

What if my switch doesn't support PoE?

If your network switch does not support Power over Ethernet, you can use a PoE Injector. 

A "single-port midspan PoE injector" refers to a device used in Power over Ethernet (PoE) technology that is placed in betweem of the (non-PoE) switch and the device. It injects power into the network cable.

Do I always need a switch for PoE?

If you only want to provide power for your tablet or iPad, you don't need a switch. You can use a PoE Injector with a PoE splliter. You will have to use Wi-Fi for your network and internet connection.

What does PoE+ mean?

PoE+ stands for "Power over Ethernet Plus." It is an enhanced version of Power over Ethernet (PoE) technology. The key difference between PoE and PoE+ is the amount of electrical power they can deliver to connected devices.

PoE typically provides up to 15.4 watts of power per port, while PoE+ is capable of delivering up to 30 watts of power per port. This increased power capacity makes PoE+ suitable for powering a wider range of devices, including those with higher power requirements, such as certain IP cameras, wireless access points, VoIP phones, and other networked equipment.

PoE+ is standardized under the IEEE 802.3at standard, whereas the original PoE is standardized under IEEE 802.3af.