The Raspberry Pi 4 is one of the best choices for those looking for a cheap single-board computer (SBC). This model comes with a quad-core CPU running at 2GHz, 4GB RAM, and 64GB eMMC flash storage. However, it does come without Ethernet support. If you want to connect to the Internet, you'll need to add a USB WiFi dongle.
PoE is a system where electrical energy is delivered to devices via cables rather than AC mains electricity. You can use PoE to power small appliances such as wireless access points (WAPS) and IP telephones.
A lot of modern technology uses PoE, including many surveillance cameras. Many home routers are designed to provide PoE too.
There are a number of different ways to supply PoE to a device. One method is to use a powered hub, which converts incoming AC mains into DC power.
Another option is to use a PoE injector box. These devices convert AC mains voltage into PoE and distribute it to individual ports.
In addition to powering your network infrastructure, there are several everyday applications for PoE. Some examples include CCTV, wireless access points (WAPs), and VoIP telephone systems.