POE Injector Splitter Adater PoE Cable ( Set of 2)AD-PC-399

A passive PoE (Power over Ethernet) injector and splitter pair is a simple, non-standardized method used to deliver power to a network device over its Ethernet cable when the network switch doesn’t provide power

Passive PoE Injector

The injector is used at the source (usually near the switch or router and power outlet).

• Function: It takes power from an external DC power supply (which you provide) and combines it with the data signal from a standard Ethernet cable.
• Connections:
  • Data In: Connects to the non-PoE network switch/router.
  • Data + Power Out: Connects to the long run of Ethernet cable going to the remote device.
  • Power Jack: Connects to the external DC power supply (e.g., $12\text{V}$, $24\text{V}$, or $48\text{V}$ adapter).
• Mechanism: Passive injectors utilize the unused spare pairs of wires in the Ethernet cable (typically pins $4,5$ for positive and $7,8$ for negative in $10/100$ Mbps setups) to carry the DC power. Crucially, the voltage passed through is exactly the voltage supplied by the external power adapter—there’s no negotiation or regulation like in standard (IEEE $802.3$ af/at/bt) PoE.

Passive PoE Splitter

The splitter is used at the destination (near the remote device, such as an IP camera, access point, or other low-power gadget).

• Function: It separates the combined power and data signal back into two distinct cables.
• Connections:
  • Data + Power In: Connects to the long run of Ethernet cable coming from the injector.
  • Data Out: Connects to the network port on the remote device.
  • Power Out: Connects to the power jack (DC barrel jack) on the remote device.
• Mechanism: It isolates the power carried on the spare pairs and directs it to the DC power-out jack, while passing the data signal through to the data-out port.

Key Characteristics and Considerations