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All Blog Articles / Enterprise Network / What Is a PoE Injector And How to Use It?

What Is a PoE Injector And How to Use It?

Posted on by FS.COM

PoE (Power over Ethernet) technology has earned itself great reputations by improving network agility and scalability in an efficient way. While capable of delivering power and data simultaneously on twisted pair Ethernet cabling, PoE has also gained a universal acceptance in applications including IP camera, VoIP phone, wireless access point and video surveillance system. Various styles of PoE devices exist, such as Gigabit PoE switch, PoE injector and PoE splitter and PoE adapter. Here we will focus on addressing basics of PoE injector and how we can benefit from it.

What Is a PoE Injector?

A PoE injector, or midspan, supports Gigabit speeds while powering compliant devices over a single cable (Cat5e/Cat6/Cat6a). The injector adds power (from the external power supply) to data that is coming from a non-PoE switch to “endspan” (IP cameras, wireless access points and LED lighting). PoE injector is perfect for low power devices that need to be set up in locations where a power outlet is unavailable. It thus enables more flexibility by offering access to install devices in hard-to-reach areas, with a minimal impact on existing structures and budget. The video below introduces the basics of PoE injector.

The following are some distinct features of PoE injector:

 Enables PoE connectivity to 802.3af/802.3at-compliant endpoint devices
 Allows wireless access points to be mounted on places where external power is not available
 Adds PoE capability to a non-PoE Ethernet switch or router

And we could benefit from using PoE injector in these ways:

 Ease of installation: simply connect the PoE injector to the PoE endpoint and to an Ethernet switch to provide data and power.
 Enables network expansion: add PoE capabilities to non-PoE Ethernet switches to provide combined power and data over Ethernet cable for better connection.
 Offers investment protection:PoE injector protects the investment by utilizing existing Ethernet equipment and cabling infrastructure, with minimal impact on budget.

How to Use a PoE Injector?

PoE injector excels in sending data while providing PoE to standard-based PoE and PoE+ compliant devices. If you have a non-PoE switch, a PoE injector should be used to power devices like network access points. Here we illustrate the steps for powering IP camera (it could be other PoE enabled devices) with a PoE injector and a non-PoE network switch, all you need is IP cameras, PoE injectors (depends on the number of powered IP cameras), standard network switch and Cat5e, Cat6 or Cat6a Ethernet cable.

1. Test all equipment to ensure the IP camera, PoE injector and management of the camera is working. Make all video and network configurations before mounting the IP camera.

2. Plug the Ethernet cable into the PoE injector’s Power/Data port and into IP camera’s PoE port.

connect poe injector to ip camera

3. Mount your IP camera in the place where adequate light is available so it could capture a clear image on the screen.

4. Plug another Ethernet cable to connect injector’s Data port and the Ethernet switch.

connect ethernet switch to poe injector

5. Plug injector power cord into a local AC electrical outlet.

connect power outlet to poe injector

Considerations for Buying PoE Injectors

So what makes the right PoE injector? You need to consider these three aspects before making the choice.

 Number of cameras: A PoE injector usually powers one device and up to two devices. For over two cameras, using PoE injector seems a cost inefficient choice, while PoE switch is a better alternative.
 Power supply – PoE vs PoE+: There are two main PoE standards – PoE and PoE+. They are also called 802.3af (Up to 15.4W) and 802.3at (Up to 30.8W) respectively.
 Power supply voltage (12V vs 24V): Security PoE cameras use 12 or 24 Volts. Always check the specification of your PoE injector power supply to match the ones in your cameras to avoid overloads or operating issues.


Small as it might be, PoE injector greatly enhances network flexibility and scalability by remotely powering PoE devices at points where no power outlet is available. And it also fixes the problem to connect non-PoE Ethernet switch to PoE enabled devices. FS.COM provides simple to use and robust Gigabit PoE injectors for Ethernet PoE power supply and data communication. For more information, just reach us via sales@fs.com.