What is POE injector?
author: Olycom
2024-06-21
PoE injector is also known as midspan device, PoE charger or PoE adapter , The non-poe switch is connected to the PoE powered device (PD) through network cables (such as Cat5eCat6Cat6a). This device is ideal for locations where low-power terminal devices need to be installed, but there is a shortage of power sockets. This solution provides a cost-effective way to dramatically improve network flexibility, removing limitations imposed by geography and existing network infrastructure.
Benefits of PoE Injectors:
- Easy Installation: Simply connect the PoE Injector to the PoE endpoint and Ethernet switch to provide data and power.
- Flexible Network Expansion: The PoE Injector adds PoE functionality to non-PoE Ethernet switches, extending network connection distances and improving connectivity by providing power and data over Ethernet cables.
- Cost-effective Solution: PoE Injectors are a budget-friendly solution since they make use of existing Ethernet devices and cabling infrastructure. By avoiding additional costs, implementing a PoE Injector solution can save a significant amount of money.
How does a PoE power injector work?
When connecting a switch or other device that lacks power supply functionality to a powered device, such as an IP camera or wireless AP, a PoE power injector can provide both power and data support up to a distance of 100 meters. Generally speaking, a PoE power injector first converts AC power into DC power, and then supplies power to low-voltage PoE terminal devices.
//www.olycom.com.cn/en/products/rugged-poe-l2-fiber-switch.htmlSelection of POE injector
Choose a standard POE injector
PoE injectors that adhere to the IEEE 802.3af, IEEE 802.3at, or IEEE 802.3bt standards are referred to as standard PoE injectors. These PoE industry standards enable automatic negotiations between the PoE power supply equipment (PSE) and the powered device upon connection, only succeeding when both devices comply with the same standard mode. When the negotiation between the two devices is successful, the power supply equipment will supply power to the powered device. Under this working mode of standard PoE technology, the safety of PoE devices can be effectively guaranteed. Generally, the power supply voltage of 802.3af, 802.3at or 802.3bt standards is 44-57V (DC).
PoE injectors that adhere to the IEEE 802.3af, IEEE 802.3at, or IEEE 802.3bt standards are referred to as standard PoE injectors. These PoE industry standards enable automatic negotiations between the PoE power supply equipment (PSE) and the powered device upon connection, only succeeding when both devices comply with the same standard mode. When the negotiation between the two devices is successful, the power supply equipment will supply power to the powered device. Under this working mode of standard PoE technology, the safety of PoE devices can be effectively guaranteed. Generally, the power supply voltage of 802.3af, 802.3at or 802.3bt standards is 44-57V (DC).
In contrast, non-standard PoE injectors fail to abide by the aforementioned IEEE standards. Generally, non-standard PoE devices function within the DC voltage range of 18 to 48 volts. In the event that both connected devices do not align in terms of voltage values, it could cause lasting damage to the devices.
Therefore, it is necessary to select standard POE power supply and POE terminal equipment
Choose the right number of ports
PoE power supplies come in a variety of models, including single-port, dual-port, 4, 8, 12, 16, and more. If you have only one powered device, you should opt for a single-port PoE power supply. On the other hand, if you have multiple PoE terminal devices, a multi-port PoE power supply may be more suitable. In this case, ensure that the number of PoE power supply ports aligns with the number of devices.
If you need to choose a multi-port PoE power supply, it is best to have 1-2 ports spare according to the actual situation as an emergency backup in the future.
PoE power supplies come in a variety of models, including single-port, dual-port, 4, 8, 12, 16, and more. If you have only one powered device, you should opt for a single-port PoE power supply. On the other hand, if you have multiple PoE terminal devices, a multi-port PoE power supply may be more suitable. In this case, ensure that the number of PoE power supply ports aligns with the number of devices.
If you need to choose a multi-port PoE power supply, it is best to have 1-2 ports spare according to the actual situation as an emergency backup in the future.
Power
The power of PoE terminal devices, such as cameras, can differ. It is essential to choose the right PSE (power supply equipment) when selecting a suitable PoE power supply. You should opt for a PoE power supply that has an output power higher than the rated power of the PD (powered device) you intend to use. If you decide to go for a multi-port PoE power supply, ensure that the combined rated power of all the powered devices is less than the total output power of the PoE power supply to prevent overloading.
Network transmission rate
The data transmission rate for PoE power supply is mainly dependent on the 10/100Base-T adaptive and 10/100/1000Base-T adaptive modes. In order to achieve a gigabit transmission rate, it is essential to select a gigabit power supply, otherwise the transmission rate will automatically decrease.
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