Data Sheet

Midspan Injector Features
Specifications
Input Voltage 7-24V, either AC or DC
Output Voltage 7-24V DC
Maximum Current 1.5A total across all ports
DC+ Output Ethernet pins 4 and 5
DC- Output Ethernet pins 7 and 8
Ports Supported 4
Power-over-Ethernet Basics
All PoE schemes require two essential elements: "Power Sourcing Equipment" (or "PSE") located inside or near your Ethernet
switch to "inject" power onto the network cable, and the "Powered Device" (or "PD") to extract and use the power. Your
4-Channel Midspan Injector fills the role of the Power Sourcing Equipment, making power available on selected network
segments to devices configured to use it.
A more detailed explanation of PoE can be found on the Freetronics website at www.freetronics.com/poe.
For supplying power to an Arduino connected to a Freetronics Ethernet Shield
(www.freetronics.com/ethernet-shield) the recommended input voltage is 7 to 12V.
Running at that voltage will allow your Ethernet shield to pass the supplied power directly
through to your Arduino for regulation to 5V simply by placing jumpers across the PoE header on
the shield. More information is provided in the Getting Started guide provided with the Ethernet
Shield.
By fitting your Ethernet shield with a PoE Regulator 24V daughter-board
(www.freetronics.com/poe-regulator-24v) you can supply up to 24V to the network
segment via the midspan injector. The PoE Regulator 24V pre-regulates the supplied voltage
down to 12V for further regulation to 5V by the Arduino's on-board voltage regulator.
About Freetronics
Freetronics is an Australian company created by Jonathan Oxer and Marc Alexander to provide cheap and easy access to
hardware, parts, and products related to Arduino projects and the Practical Arduino book. Learn more at
www.freetronics.com. Follow us on Twitter at twitter.com/freetronics.