There are many different models of POE Injectors, lets get into it!
A POE injector powers devices that accept Power Over Ethernet. These devices do not have a separate power supply and then another Ethernet Port to connect to the Internet. Power Over Ethernet supplies Internet AND Power. There are several different makes and models. This article will help you understand what POE is, how to use it and make sure you purchase the correct one when you are ready!
To understand, lets go over the different types of POE Injectors.
All POE Injectors have a Data Input connector, a Data Connector and a power source which normally is a standard power source going to 120V. Normally POE Injectors come with a Gigabit Data Connector which is an input from the source which is a router or a switch.
This is the “Standard POE” with a maximum output power of 15.4 Watts. A Standard POE has the normal gigabit data input and the powered output. The difference is the power. A Standard POE is IEEE 802.3af is also known as standard PoE with supply voltage of 44-57V, and supply current of 10-350mA. In this standard, the maximum power output of a port is limited to 15.4W. However, some power will be lost on the Ethernet cable during the transmission. This is called Attenuation.
POE + has more output power which doesn’t exceed 25 watts. The supply voltage of PoE+ ranges from 50V to 57V, and the supply current can be 10-600mA. It provides up to 30W of power on each port of a PSE. Due to power loss, the minimum output power assured on each port is 25W.
POE++ IEEE 802.3BT Or Type 3 POE++ has even more power which doesn’t exceed 60 watts.
POE++ IEEE 802.3BT Or Type 4 POE++ Has the most power rated at no more than 100 Watts.
There are a few more types that have a plug directly on them. These are some examples of different shapes and models of the same types of hardware which do the same thing.
The purpose of these injectors are to power devices without having to run additional cabling. Its just one cable and done. The issue comes down to how much power the item your installing is pulling. In some of the newer Access Points they pull a lot of power. In our test bench setups we are using 60+ watts of power to power WiFi 6e. That’s a lot of power. The point is you do not have to purchase an expensive switch to power just one or two devices. When you get into having to install 5 or more then it would be smart to purchase a good POE++ switch which has more than 5 ports which makes it cost effective.
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|Pins at switch||T568A color||T568B color||10/100 mode B,|
DC on spares
|10/100 mode A,|
mixed DC & data
|1000 (1 gigabit) mode B,|
DC & bi-data
|1000 (1 gigabit) mode A,|
DC & bi-data
|Rx +||Rx +||DC +||TxRx A +||TxRx A +||DC +|
|Rx −||Rx −||DC +||TxRx A −||TxRx A −||DC +|
|Tx +||Tx +||DC −||TxRx B +||TxRx B +||DC −|
|DC +||Unused||TxRx C +||DC +||TxRx C +|
|DC +||Unused||TxRx C −||DC +||TxRx C −|
|Tx −||Tx −||DC −||TxRx B −||TxRx B −||DC −|
|DC −||Unused||TxRx D +||DC −||TxRx D +|
|DC −||Unused||TxRx D −||DC −||TxRx D −|