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How to Choose the Right PoE Injector for Your Businesses?

Time:2022-03-30 Source:UTEPO

In recent years, with the development of PoE technology becoming more and more mature, it has been widely used in various fields. In addition to PoE switches, the products like PoE injectors, PoE splitters, etc., are also commonly used in network systems. And the PoE injector has become a new favorite for wireless coverage, security monitoring, and other application scenarios of simple equipment installation, flexible networking, low cost, and security.

What is the PoE injector?

PoE injector works by connecting non-PoE switches to PoE-powered devices (PDs) via network cables. This device is used in places where low-power-consuming end devices need to be installed but power outlets are not available. This solution enables PoE to power up end devices at a lower cost, enhancing the networking flexibility and eliminating the limitations of geographic and existing network architectures for device installation.


The advantages of PoE are mainly reflected in the following aspects.

Easy to install: Simply connect the power supply to the PoE terminal equipment and the switch respectively to provide power and data transmission support.

Easy to expand: The data signal output from non-PoE switches can be injected into the power signal through the network cable, thus providing power and data transmission support for the powered devices and bringing convenience to the device connection.

Cost-saving: The use of PoE can save money by preserving the original network architecture while effectively using the original equipment.

Market demand has given rise to the development of the PoE market, in line with the IEEE 802.3af/at/bt standard 15W, 30W, 60W, 90W PoE injector emerged for the terminal equipment networking and power supply to bring convenience, but also to help users save the expense of buying a PoE switch.

When facing a wide variety of products, how to choose the right PoE injector?

Selection of PoE Injector

Choose the proper number of ports

PoE injectors are available in single-port, 2-port, 4-port, 8-port, 12-port, 16-port, etc. If there is only one powered device, choose a single-port PoE injector. If there are multiple PoE end devices, consider a 2-port PoE injector to ensure the number of PoE ports matches.

When choosing a multi-port PoE injector, it is best to spare 1-2 ports according to the actual situation as an emergency backup for the future.

Choose the active PoE injector

It is necessary to ensure that the PoE injector and the connected powered device operate at the same voltage. Typically, the voltage of active PoE devices (IEEE 802.3af/at or IEEE 802.3bt) is DC 44-57V, while passive PoE devices operate at the voltage of DC 18-48V. Two devices connected with mismatched voltage values may cause damage to the device.

Under the PoE standards (IEEE 802.3af, IEEE 802.3at, or IEEE 802.3bt), the PSE and the PD will negotiate automatically when they are connected, and the negotiation will be successful only when both devices comply with the same standard mode. When the two ends of the device negotiation are successful, the PSE will supply power to the PD.

Therefore, it is recommended to use active PoE devices considering their safety. General, the IEEE 802.3bt is backward compatible with 802.3af/at devices.

The output power of the PoE injector is greater than the total rated power of the PD

The power of PD devices (IP cameras, IP phones, etc.) ranges from low to high. When choosing a matching PSE, you should use a PoE injector whose output power is greater than the rated power of the PD. If you use a multi-port PoE injector, then the total rated power of all PDs should be less than the actual total output power of the PoE injector to avoid overload.

Network transmission rate

The data transmission rate of the PoE injector is mainly 10/100Base-T adaptive and 10/100/1000Base-T adaptive. If you need a gigabit transmission rate, you must choose a gigabit injector, or the transmission rate will automatically drop.

UTEPO PoE injectors all support 10/100/1000Base-T adaptive transmission rate, with the highest transmission rate up to 1000Mbps.

To meet the increasing transmission rate requirements of users, UTEPO also provides a PoE injector with a transmission rate of up to 2.5Gbps.

If any interests you, please contact us at info@utepo.net to get the quotation.

UTEPO PoE Injectors

Key Features

● IEEE 802.3af/at/bt

UTEPO bt PoE injectors are compatible with IEEE 802.3af/at/bt and support powering increasing-demand 15W, 30W, 60W, 90W PoE-powered devices.

● Flexible Networking, Easy to Expand

It can provide power and data transmission for powered devices at the same time. Great cost savings by effectively using the original equipment and retaining the original network architecture.

● All-in-One and Compact Size Design

It is easy to install the PoE injector through the plug-and-play way without the need for software configuration. UPI3301-PSD also comes in a compact housing, making it flexible in the use of installation space.

● Splicing Design

There are slot and bulgy junction set on opposite sides of the PoE injector, which enables you to combine them and made a neat line to the convenient management in case more injectors are installed.

● Excellent Performance of Protection and Anti-interference

Support 6kV surge protection and 8kV ESD protection, ensuring stable operation.

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