PoE Switch VS. PoE Injector: Which Should Choose for PoE Networking System Setup

The Internet has become an important part of our daily lives. In order to make life more convenient, there are various network devices on the market, such as IP phone, wireless access point and IP camera. These devices not only need to get the network through the Ethernet cable, but also need to get the power through the wire. When the number of devices is large, the wiring will be complicated. How to solve this problem?

Recently, PoE (Power over Ethernet) technology has been widely used, which can transmit power and network simultaneously through a single Ethernet cable. PoE devices include power sourcing equipment (PSE) and powered devices (PD). PSE is a device for transmitting power, and then PoE switches and PoE injectors are PSEs. Devices that receive electricity are called PDs. People often ask:  PoE switch vs. PoE injector: Which one should choose? This article will compare these two PSEs to help you make a choice.


What is a PoE switch?

PoE network switches or Power over Ethernet switches are built-in PoE injection network switches. Therefore, it can transmit both power and network to the PD directly connected to it through a single Ethernet cable. PoE network switches are considered to be one of the smartest ways to invest in your network system.

PoE switches are mainly used with IP cameras, VoIP phones and wireless access points (WAP). You can usually buy 4/8/16/24/48 port PoE switches. PoE network switches can be divided into many types, such as unmanaged, managed PoE switches, outdoor PoE switches, industrial-grade switches, and 800m long-distance PoE switches. PoE switches provide power and establish network connections for IP cameras that support PoE through network cables such as Cat5, Cat5e and Cat6.

What is PoE Injector?

Power injectors are also called PoE injectors or midspans. They are small, simple hardware devices connected to your network, allowing you to power other devices through your network. There are two types of PoE injectors, including passive PoE injector and active PoE injector.

In order to add PoE to conventional non-PoE network connections, PoE injectors are often used. Although all ports of PoE switches can be used for power supply and network transmission, some older switches without PoE function cannot be used with PoE devices because they can only transmit network but not power. Fortunately, if you just want to use PoE technology, you don’t need to upgrade all your existing switches to PoE-compatible switches. Compared to replacing your original network infrastructure, PoE injector is a cheap and easy way to allow some PoE devices to be used with non-PoE switches.  

The injector injects power into the data obtained from the non-PoE switch and transmits the power and network to the PD through a single Ethernet cable (such as Cat5e and Cat6 cable). The two main benefits of using power injectors in your network are cost and flexibility.

PoE switch vs. PoE injector: The choice depends on network requirements.

Among the two PoE PSE devices mentioned above, PoE network switches are currently the most commonly used devices. Because of its high efficiency and cost-saving advantages, PoE switches are often the first choice when planning to establish a PoE network for homes or offices.

However, before PoE switches became popular, non-PoE switches were usually used in home or office network construction. When you need to add some PDs with PoE to these network systems, what would you do? In this case, you don’t need to discard the existing non-PoE switch and buy the new ones with PoE. PoE injectors can be added to each PD, saving you the trouble of upgrading switches. However, it should be noted that the PoE injector is only suitable for PoE network systems with a few PDs. If you want to add dozens of PDs, it is more appropriate to choose a PoE switch.

As the company continues to expand and homes become more and more intelligent, PoE switches are an effective part of taking your network in the right direction. Any network device that requires a small amount of power to operate and communicate on the network can be plugged into the PoE switch. PoE injectors can still meet some special needs. The latest IEEE802.3 bt standard can provide 95W high power, and the 95W PoE injector is a good choice without changing the existing network infrastructure. 10G PoE injector is another device that injects power into a 10G network. So how to choose PoE switch and PoE injector depends on the actual situation. The PoE switch has integrated the power supply in the switch, and the PoE injector is used as a power supply that can increase the power to the twisted wire and transmit the network and power to the front-end IP devices.

What’s the Difference Between PoE NVR and PoE Switch?

“I’m going to install two IP cameras in my house. If the NVR already has PoE switch built in, just use that? Actually, I have no idea whether to use a PoE NVR or a PoE switch matching with them. So, what’s the difference between them? Can some one help me?” This article intends to explore the differences between PoE NVR and PoE switch. Let’s break down the differences and the pros and cons of each in details so that you can make an informed decision.

What is PoE? 


Power over Ethernet (POE) is a technology that lets network cables carry DC power. PoE connections offer greater flexibility in terms of where you can locate a device, because with a PoE connection, there is no need for the additional power cable. This reduces the complexity of installing in awkward locations.

You can find two kinds of PoE capable devices today: power sourcing equipment (PSE) and powered devices (PD). Sometimes a device functions as both a PSE and PD. 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.

PoE benefits organizations in 5 five primary ways — 1. reduced installation costs, 2. increased installation safety, 3. responsive deployments, 4.high performance data-gathering capabilities, and 5. productivity enhancements. POE has many applications, but the three key areas are: VoIP phones, IP cameras, Wireless access point.

What is PoE switch?

A switch is a device that allows devices on a network to communicate. A PoE switch has the Power over Ethernet functionality built into it, delivering power and data over the same cable for easy installation. It is a dedicated device that contains multiple Ethernet ports to provide power and network communications to IP devices. This allows a PoE switch to expand the reach of an NVR system because you can connect IP cameras to the PoE switch rather than the NVR. A PoE switch expands a network created by a router. Therefore, it must be connected directly to a router on the same network as your NVR. Most PoE switches have limited power, so you can only power smaller devices.

What is PoE NVR?

PoE NVR is a network video recorder with built-in PoE switch meant for use with PoE based IP cameras. Equipped with a PoE switch, the PoE NVR provides both power and network to the cameras via a single Ethernet cable. There is no need for an additional PoE switch, which will reduce the cost of equipment in theory. Simply run one CAT5e/6 cable from the camera to the NVR, and it will provide power to the camera while streaming video/audio/data all over one single cable.

The Difference between PoE NVR and PoE switch

From the above, you will see that both PoE NVR and PoE switch can provide power and data transmission. However, the former is limited in minimal network administration experience while the latter can expend the network freely. With PoE NVR, all the cameras have directly wire back to the NVR as the PoE switch is integrated to recorder box which is good and not good. If the system is small such as 4-channel IP camera system, PoE NVR makes the setup quickly. However the flexibility gets worse while the cameras are increasing. With PoE switch, multiple cameras can connect to different switch before it return to the NVR. Thinking that a PoE switch needs to be placed anywhere near your NVR or router would be a mistake when there are many camera in the system. It makes the most sense to place your switch as close to the biggest cluster of cameras as possible. This can make for a lot of short cable runs from IP cameras to switch. From there, it’s just a matter of running a single cable from that switch back to your router. The end result is that you simultaneously put all of your IP cameras on your network by running that one cable.

There’s no way to conceal the fact that purchasing an NVR with a built in switch is going to be cheaper. A standard NVR purchased together with a dedicated PoE switch will probably cost you about 25% more than the alternative. If you still have a demand for the same type of “camera hardwired to NVR” setup and your NVR is out of warranty, you’ll now find yourself needing to replace the entire NVR instead of the much cheaper network switch. The PoE switch is being integrated into the PoE NVR, if the PoE NVR go defective, the both NVR and the switch has to be replaced.

The PoE NVR is going to require that you run your cable the same way you would with an analog system. In this scenario, you’re going to be running a cable for each camera all the way back to the NVR to create your hardwired connection. Your cable length is limited, in this case, to the standard 328 feet unless the PoE extender is being deployed.