What is the difference between a PoE injector and a PoE splitter?

What is the difference between a PoE injector and a PoE splitter?

What is the difference between a PoE injector and a PoE splitter?

The difference between an injector and a splitter is that a PoE injector sends power to PoE equipment that receives data through existing non-POE switches. A splitter also supplies power, but it does so by splitting the power from the data and feeding it to a separate input that a non-PoE compliant device can use.

What is Ethernet technology?

Power over Ethernet (POE) technology sends 10/100/1000 Mbps of data and 15W, 30W, 60W, and up to 90W of power budget to devices over Cat5e and Cat6 Ethernet cables for a maximum distance of 100m.

What is a PoE injector?


A POE injector, a device also commonly known as a “midspan,” introduces or injects power onto an Ethernet cable. The injector adds power to data that is coming from a non-PoE switch or “endspan.” It has an external power supply.

Injectors allow admins to populate and properly support LANs with both compliant and noncompliant devices.

What is a PoE Splitter?


A splitter, another frequently used power device, goes in the opposite direction of the Injector. It has two output cables: one supplies data and the other power. It is used to deploy remote non-PoE devices with no nearby AC outlets.

A splitter allows a non-compliant device to upgrade to POE. By plugging into the network connection, it can pull power, and convert it into low-voltage ranges as required.

What is a PoE power budget?

A power budget is the total amount of power a device can send through an Ethernet cable.

What levels of power are PoE injectors and splitters able to deliver?

Both the injector and the splitter deliver power according to each of the 4 types of power. Check manufacturer specifications. The newer the device is to the PoE product list, the higher the level of power will most likely be needed. Type 3 is the current mainstream. Type 4 products are emerging fast.

Levels of PowerIEEE StandardWatts Supplied
Type 1IEEE 802.3afUp to 15.4W
Type 2IEEE 802.3atUp to 30.8W
Type 3Ultra PoE / 802.3btUp to 60W
Type 4IEEE 802.3btUp to 90W


That means a power budget of 90W and the capability to support the newest generation of devices.

What types of devices are supported by PoE injector and splitter?

The right injector or splitter for your job will be clearly indicated by the IEEE 802.3 extension provided by the manufacturer: .af, .at, Poe Ultra, and .bt.

How PoE injectors and splitters save money?

First and foremost the PoE injectors and splitters save money by allowing IT pros to combine legacy devices with newer, more efficient PoE networking components.

They also allow organizations to add remote devices without having to install electrical infrastructure. Injectors and splitters are designed to provide power to and from non-PoE compliant equipment.

These inexpensive units will add years to a legacy system and can literally save thousands of dollars by bypassing the installation electrical outlets in remote locations.

If you would like some assistance with incorporating injectors and splitters into your system, read more here.

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Comments (7)

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    August 29, 2018 at 5:30 am
  • David Reply

    I was randomly going through the stock room looking at devices when i came across them. Thank you very much for this info.

    September 14, 2018 at 8:10 am
  • PoE Injector Reply

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    September 21, 2018 at 2:18 am
  • clint Reply

    Thank you for the explanation. Great articles!

    October 4, 2018 at 10:31 pm
  • Monika@cisco glc-sx-mm Reply

    I haven’t used this before but I am going to give a try to this one. I hope everybody will like it.

    November 14, 2018 at 8:13 am
  • Carmela Reply

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    March 13, 2019 at 2:45 am
  • clint Reply

    These a great products to use when you have a non poe device such as a smart home wifi hub in a multi family housing. We installed about 30 of these with the POE adapters and they work great.

    November 2, 2019 at 12:13 pm

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