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What is a PoE Injector?

Author: Apogeeweb
Date: 18 May 2022
 291
ubiquiti poe injector

Catalog

Ⅰ Introduction

Ⅱ What is a PoE Injector?

Ⅲ How Does a PoE Injector Work?

Ⅳ Features of PoE Injectors

Ⅴ Types of PoE Injectors

5.1 Active VS. Passive PoE Injector

5.2 12V VS. 24V VS. 48V PoE Injector

5.3 Single Port VS. Multiple Port POE Injector

Ⅵ How to Use a PoE Injector?

Ⅶ What Does a PoE Injector Do?

7.1 Data in Port

7.2 PoE/Data Out Port

7.3 PoE Standards

Ⅷ Things to Consider When Buying a PoE Injector

8.1 Ease of use

8.2 Power supply

8.3 PoE and PoE+ Injector

8.4 Design

8.5 Quality

8.6 Gigabit or not

Ⅸ Frequently Asked Questions About the PoE Injector

 

Ⅰ Introduction

Power over Ethernet (PoE) transmits both power and data simultaneously over twisted pair Ethernet cabling. This technology enhances network agility and scalability in a cost-effective and efficient manner. There are various sorts of PoE devices, such as the PoE switch, PoE splitter, PoE injector, and so on. This article is about the PoE injector: What exactly is it? How does it function? Are there various kinds? How is it set up?

 

 

What is a PoE Injector?

PoE injectors provide or inject direct current (DC) power through network cables to power network devicesMidspans and midspan hubs are other names for them. PoE injectors allow Ethernet, a popular LAN protocol, to transport DC power along with data packets. This eliminates the need for separate power cords, lowering wiring costs and making troubleshooting easier.

 

PoE injectors, like other PoE equipment, adhere to IEEE 802.3 af, a power distribution standard developed by the Institute of Electrical and Electronics Engineers (IEEE). The 802.af standard specifies two modes of operation: Type A, which sends power and data over the same data pairs as Ethernet, and Type B, which sends power through unused pairs

 

 

 

How Does a PoE Injector Work?

How Does a PoE Injector Work

 

When Ethernet switches or other devices lack PoE functionality yet must support PDs (Powered Devices) such as PoE IP cameras, PoE wireless access points (WAP), PoE lighting, and so on, a PoE injector can aid deliver both power and data to these PDs at distances of up to 100 meters. A PoE injector often transforms alternating current to direct current so that it can power low voltage PoE devices.

 

Features of PoE Injectors

  • Power over Ethernet increases flexibility

The IEEE 802.3af Power over Ethernet (PoE) standard allows for the transmission of both electrical power and data over a single twisted-pair connection. By removing connection to a power source, shared cabling minimizes installation costs, reduces the space required for wires, and allows for greater flexibility in placement.

 

  • Simple installation

A typical IEC plug is used to connect to alternating current power. Inline installation using regular CAT 5e Ethernet wires.

 

  • For use in virtually any environment

The injector is globally useable due to its universal AC input voltage rating of 100 to 240 VAC and important safety approvals such as UL/cUL, CE, and FCC.

 

  • Compact and easy to use

The case measures only 140 x 65 mm (5.5 x 2.6 in). It has a total output power of 15.4 W. For easy troubleshooting, diagnostic and indicator LEDs display ON and fault states.

 

Types of PoE Injectors

5.1 Active VS. Passive PoE Injector

A PoE injector adheres to the IEEE802.3af, IEEE802.3at, or IEEE802.3bt PoE standard—use active PoE. 802.3af/at/bt as a handshake between power sending and receiving PoE devices. The 802.3af/at/bt injector will not power up if the receiving device does not provide the necessary acknowledgment, which means the PoE injector will verify the power coming in and will not power up if the power does not satisfy the device requirements, assuring the PoE device's safety. Normally, the 802.3 af/at/bt PoE voltage will be between 44 and 57 volts DC.

 

A passive PoE injector, on the other hand, employs PoE technology that does not comply with the 802.3af, 802.3at, or 802.3bt standards. Passive PoE devices are typically powered by 18 to 48 volts DC. If the incorrect voltage is supplied, the device may sustain irreparable electrical harm.

 

5.2 12V VS. 24V VS. 48V PoE Injector

PoE injectors are classified as 12V, 24V, or 48V based on the output power voltage they can offer. When choosing a PoE injector, compare its voltage to the voltage standard of the PoE device that has to be powered.

 

5.3 Single Port VS. Multiple Port POE Injector

A single port POE Injector features two RJ-45 ports in addition to electricity. This can power a single POE capable device that is attached to it. A Cat x cable connects the switch to one of the POE injector ports, and another lengthy cable connects the next port (carrying both power and data) to the network device that requires power. The POE Injector is kept close to the network switch so that it may use the power from the racks, UPS, and other devices. Yes, the POE Injector must be powered by an AC/DC source!

 

Single port POE Injectors are available in 10/100 Mbps and 10/100/1000 Mbps versions to handle 1GE networks. They have a maximum power output of 15.4W (roughly) and comply with IEEE 802.3af regulations. This standard must be supported by both the Power Over Ethernet Injector and the network device powered by it. When a single wireless access point is required for a conference room, there is no need to purchase a POE Enabled Switch with all ports!

 

Assume you have a 24 port switch (without POE capability) and you want all 24 ports to support POE devices. You can either replace the switch with a POE enabled switch or purchase a POE Injector with several ports. This also appears to be a changeover! Instead of 24, it contains 48 ports plus a control port. As a result, each switch port is linked to one of the ports of this multi-port POE Injector, and each network device that requires power is likewise connected to this multi-port POE Injector.

 

Ⅵ How to Use a PoE Injector?

PoE injectors excel at data transmission while supplying PoE to PoE, PoE+, and PoE++ compliant devices. In a real-world application, a PoE injector acts as an intermediate between a non-PoE switch and a PoE compliant device. The PoE injector will power devices such as IP cameras and wireless access points.

 

How to Use a PoE Injector 1

 

Using an IP camera as an example, the following steps will demonstrate how to power it on. IP cameras, PoE adapters (depending on the number of powered IP cameras), a basic network switch, and Cat5e, Cat6 or Cat6a Ethernet patch cables are all required.

 

1. Check all equipment to check that the IP camera, PoE injector, and camera management are all operational. Before attaching the IP camera, complete all video and network configurations.

 

2. Connect the Ethernet cable to the PoE injector's Power or PoE port and the PoE port of the IP camera.

 

How to Use a PoE Injector 2

 

3. Position your IP camera in an area with appropriate lighting so that it can capture a good image on the screen.

 

4. Connect the injector's Ethernet or Data port to the Ethernet switch using another Ethernet wire.

 

How to Use a PoE Injector 3

 

5. Connect the injector power wire to a standard alternating current (AC) outlet.

 

What Does a PoE Injector Do?

By "injecting" power into the Ethernet wire, a PoE injector powers a security camera. A PoE injector is typically plugged into a conventional wall outlet and then converts the alternating current (AC) into direct current (DC) to power the low voltage network security camera. A PoE injector will almost usually have two RJ45 Ethernet connections, one labeled Data in and one labeled PoE/Data Out. Let's go over each port and what it accomplishes.

 

7.1 Data in Port

The Data In port allows the security camera to be connected to the local network. This is usually your home router, the NVR camera port, or a network switch. The camera will be unavailable from the local network if this port is not connected.

 

7.2 PoE/Data Out Port

The PoE/Data out port serves two functions: it powers the camera and completes the network, allowing data transfer to be completed. The camera will not switch on and will not connect to the NVR/network if this port is not connected.

7.3 PoE Standards

Two major standards exist currently for PoE devices 802.3af & 802.3at.

 

802.3af

The PoE standard allows for up to 15.4 W of DC power. This is the older of the two standards, yet many cameras still have it listed as a specification.

 

802.3at

PoE+, or PoE plus, provides up to 25.5 W of power and is backwards compatible with 802.3af devices. Because of the larger power budget in the PoE+ standard, IP security cameras could now enter the PTZ market.

 

Things to Consider When Buying a PoE Injector

PoE (Power Over Ethernet) injectors supply power to Ethernet connections, allowing PoE-enabled equipment to operate. They are typically useful where power is inaccessible and are utilized with existing non-PoE routers or networks. Power is required for devices such as access points and IP cameras, which can be provided via PoE injectors. As a result, they are extremely useful for powering low-power compatible devices over a single wire.

 

If you're thinking about purchasing a PoE Injector this year, examine the following considerations first. It will assist you in making a more informed selection.

 

8.1 Ease of use

The ease of usage of PoE injectors varies. Both sophisticated and basic PoE injectors are available on the market. Their designs differ, making them unique when used. It can be difficult to connect to the supplied ports at times since no reliable information about their usage is provided. So, to avoid confusion later on, seek for this ease of use feature right away. All injectors are simple to use and install if you have the proper understanding.

 

8.2 Power supply

Consider the whole injector supply. There will be several power supply readings that you will notice. Some will state 48W, while others will state 15W or 30W of total power supply. You must first determine the power requirements of your gadget. If you're connecting a low-powered IP camera or access point, 15W of total power supply is more than plenty. In the case of injectors with several ports, check for a power supply in each port to meet the needs of the device you intend to attach to that port.

 

8.3 PoE and PoE+ Injector

Passive PoE injectors are simple PoE injectors that can power devices such as radios, antennas, and cameras that operate on 18-48V DC. So it essentially provides electricity to devices that aren't 802.3at/af compliant. However, if your devices comply with 802.3af/at standards, only PoE+ or Active PoE injectors should be used. Active PoE monitors the power entering and leaving the device. PoE++ injector is another term for it. We didn't locate any high-quality PoE++ injectors during testing because the technology is still in its early stages.

 

8.4 Design

The term "design" refers to the device's small shape. It enables for portability and makes the injector more accessible. Also, make certain that it is lightweight. Lightweight injectors outperform heavy injectors. Indeed, as technology advances, manufacturers are developing lightweight and compact devices.

 

8.5 Quality

The majority of injector bodies are constructed of plastic. It's not a negative thing because plastic is a strong conductor of electricity, but the cheap plastic utilized is worthless. As a result, one of the most important elements to consider is quality and durability.

 

8.6 Gigabit or not

A PoE injector not only powers IP cameras but also connects them to the network. As a result, having a gigabit PoE injector is advantageous because it operates at ultra-high gigabit speeds of up to 10/100/1000 Mbps.

 

Ⅸ Frequently Asked Questions About the PoE Injector

1. How do you install a PoE injector?

Let's stick with the IP security camera as an example. The following are the six steps to take:

 

(1)You will need an IP camera, a PoE injector, a basic network switch, and Cat5e, Cat6, or Cat6a Ethernet wiring.

 

(2)Ensure that the IP camera, PoE injector, and IP camera management all function properly.

 

(3)Before mounting the IP camera, ensure that all video and network configurations have been completed.

 

(4)Plug the Ethernet cable into the PoE/Data Out port of the PoE injector, then connect the other end of the wire to the PoE port of the IP camera.

 

(5)Mount the IP camera in a well-lit area so that it may capture a good image on the screen.

 

(6)Plug another Ethernet cable into the Data In port of the PoE injector, then connect the other end to the Ethernet switch.

 

(7)Plug the PoE injector's power cord into a nearby alternating current socket.

 

2. Where can a PoE Injector be used?

PoE allows you to power various devices, such as IP cameras, allowing for quick development and easy re-positioning. All the while transferring the requisite Ethernet connection for it to function properly.

 

A VoIP phone was one of the first PoE applications. A phone could have a signal connection to a wall socket while being remotely powered off by using a PoE Injector.

 

Bluetooth and Wi-Fi (wireless access points) PoE is frequently supported by APs and RFID readers.

 

3. What is the difference between a PoE and PoE+ Injector?

The primary distinction between PoE and PoE+ Injectors is the power supply rate. Over Cat5 cables, PoE can output 15.4 watts, whereas PoE+ can output 30 watts. The device receives somewhat fewer watts than the injector outputs.

 

4. Will my internet speed boost if I use a PoE Injector?

A PoE injector should have no effect on network speed because it adds power to the existing cable without interfering with the data link.

 

5. What is PoE plus injector?

OUTREACH PLUS POE Plus Injector with Enhanced POE Plus The OUTSOURCE PLUS injector is a small Power over Ethernet Plus (POE Plus) device. It injects IEEE 802.3at POE into Cat 5 or equivalent network cabling to provide consistent remote power to PTZ IP cameras, 802.11n wireless access points (APs), and other high-power devices.

 

6. Where to put PoE injector?

The POE injector can be installed anyplace in the line that is handy for connecting to AC wall power using the provided transformer. The transformer is plugged into a wall outlet and supplies 12VDC power to the brown pair of the ethernet cable.

 

7. What are the PoE injector specifications?

Inlet type, input voltage, data line pin-out, category 3 (CAT-5) cable pin-out, supply voltage, maximum current, notional available output power, and nominal output voltage are all electrical requirements for PoE injectors. Input currents can be chosen between 110 and 220 VDC, or between 100 and 250 VAC.

 

8. Do you need a PoE injector?

You'd have to utilize a PoE injector for every device on the network if you didn't want to upgrade your non-PoE enabled network switches. Sure, this wouldn't be an issue if you were putting up a home network with only a few devices - but as the network grows and more devices are added, trying to remedy the problem with PoE injectors would quickly turn into a giant jumbled mess of cables.

 

9. What is the difference between a Passive and Active PoE Injector?

Active PoE injectors, such as those built to the 802.3af and 802.3at specifications, act as a bridge between the connected device and the power source. The injector only releases power if it judges it to be an appropriate amount in accordance with the connected device's standards/requirements. Otherwise, the device is not powered on.

 

Passive PoE injectors, on the other hand, do not evaluate any power requirements of the linked device and just deliver the energy as it is received from the source. To put it another way, the injector does not perform a handshake with the device to calculate the power need. As a result, it can be hazardous to use when connected to an incompatible equipment.

 

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