Power over Ethernet (POE)
What you need to know
Power over Ethernet is a standard that allows you to power certain network or IP devices over that same data cable that connects it to your network. There are 3 primary implementations of POE that will be described individually. Before we go into that, there is some information that you need to know about your product to determine which implementation and hardware you will need to get your desired results.
- Is the IP device/camera you are using true POE or not?
- Does your network switch supply POE power?
The first question is the most important, because it determines all of your remaining hardware requirements. Below are examples for each implementation type and why.
In the first example you have a switch that supplies POE and are looking to get an IP camera that supports true POE, in this situation you only require a network cable running directly between the switch and the camera. This is because the camera is capable of being powered over the Ethernet itself and the switch supplies POE. (See image below)
(POE switch directly connected to a true POE camera)
In the second example you are interested in an IP camera model that supports true POE, but you do not have a switch or router that provides POE. In this event you will need a POE injector in addition to the switch/router and your POE IP camera. You will connect them like the image below.
(Standard switch connected to a true POE camera via a POE Injector)
In the final example you have a switch/router, that does not provide POE and you are interested in an IP camera that does not support true POE. In this case you can use a POE injector/Splitter kit. To connect this configuration you would connect your switch/router to the POE injector, Connect the POE injector to the POE splitter, and the POE splitter will connect to the camera as you see below.
(Standard switch connected to a standard IP camera via a POE Injector Splitter)
Below you will see a close up of the POE splitter and its connection to the camera. The splitter has both power and Ethernet outputs to connect the network and power separately.