Adafruit Passive PoE Injector Cable Set

Simplify your Internet of Things with a passive PoE injector cable. These are quite handy for projects with Ethernet connectivity that also require a power cable. Long Ethernet cables can complicate setups, but a passive PoE injector merges power and data effortlessly.

The official Power-over-Ethernet standard utilizes a 48VDC power line, necessitating specialized equipment. For budget-friendly DIY projects, consider these cables as an alternative. One cable (the injector half) features an Ethernet plug and port alongside a 2.1mm jack. Connect a power supply, such as a 9VDC wall adapter, and the injector merges the power, directing it through pins 4, 5, and grounds 7, 8, known as "Mode B" compatibility.

The extractor half performs the reverse, diverting pins 4, 5, 7, and 8 to a 2.1mm DC barrel plug, enabling you to power projects as if connected directly to the adapter. Note these aren't official PoE cables and must be used as a pair; they can't power devices from an official PoE host.

Bear in mind, Ethernet cables over 10 meters act as resistors. Typically, these cables are 24AWG with 0.085 ohms per meter, leading to a 1 Volt drop for roughly every 25 meters. Additionally, since these cables use pins for power, they aren't compatible with gigabit Ethernet but will adjust to 10/100 megabit automatically.