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Power over Ethernet Switch FAQs

Author Leslie

Date 01/09/2024

This article provides you with answers to some common questions about PoE switches, offering you a deeper understanding of PoE after reading.

With the continuous development of technology, the popularity of Power over Ethernet (PoE) switches is on the rise, and the corresponding PoE technology is gaining increased recognition. However, various deployment, connectivity, and functionality issues have arisen with its widespread application. This article will guide you through some common issues with PoE switches and provide detailed answers to these questions. After reading, you will have a deeper understanding of PoE switches and PoE technology.

What is PoE Switch? 

A PoE switch is a network device that can provide power and data transmission functions to devices through a single copper cable. It integrates standard network switches with power sources, streamlining wiring while offering greater flexibility in deploying PoE devices. PoE switches encompass three power supply protocols, namely IEEE 802.3af/at/bt, with theoretical maximum power supply values of 15.4W, 30W, and 90W, respectively. When selecting a PoE switch, it is crucial to consider your device's power supply requirements.

FAQs

Can PoE switches be connected to non-PoE devices? 

PoE switches can be used in conjunction with non-PoE devices. Typically, a compliant PoE switch detects and identifies whether the target device supports PoE before supplying power. If the device supports PoE, the switch provides power; Otherwise, it only offers data transmission functionality. If you need to install non-PoE devices at locations far from a power source, you can use them with a PoE splitter. The PoE splitter separates the PoE signal into data and power components. The network interface of the terminal device transmits data through the Ethernet cable, while the power interface connects to the PoE splitter's power source, supplying power to the device. Additionally, the PoE splitter provides an extra layer of protection for the device, enhancing network stability and reliability.

What is the longest transmission distance of a PoE switch?

The maximum transmission distance of PoE switches is 100 meters. However, this limitation on the transmission distance is not determined by power but by the Ethernet cabling standards. The IEEE 802.3 standard specifies a maximum length of 100 meters for PoE cables. Beyond this distance, there may be a decrease in power transmission efficiency, leading to potential issues with device operation. Therefore, to ensure reliable power supply in the network, the maximum transmission distance is restricted to 100 meters.

How to extend the transmission distance of the PoE switch?

The standard transmission distance of a PoE switch is 100 meters. If you need to exceed this distance, you may consider using a PoE extender to extend the transmission range. PoE extenders can provide additional extensions for the transmission distance, but it's essential to ensure the selection of a suitable extender to guarantee the stability and reliability of both data and power transmission. When choosing a PoE extender, ensure it is compatible with the PoE switch and consider its support for PoE standards. Typically, a PoE extender can extend the distance by approximately 100 meters in a single extension. If further extension is required, you can consider cascading multiple PoE extenders.

IEEE 802.3 af/at/bt, how to choose?

To choose the appropriate IEEE 802.3af/at/bt standard, selection should be based on the power supply requirements of the device. The maximum power supply for a single port under these three standards is 15.4W, 30W, and 90W, respectively. For instance, if your device's power consumption is 21W, then IEEE 802.3at is the most suitable choice. It's essential to note that as long as your device's power consumption is less than or equal to the maximum power supply per port according to the PoE standard, it is compatible and usable. It's worth noting that the deployment of WiFi 6 requires the use of the IEEE 802.3bt power supply standard. If you plan to deploy WiFi 6 devices, please make sure to choose PoE++ equipment.

How to determine how much power budget is needed for a PoE switch?

Before determining the power budget of a PoE switch, it is essential to understand the number of devices required and their power consumption. For instance, if a PoE switch with a 130W power budget, supporting the IEEE 802.3at standard, is chosen, and the devices have a power consumption of 15W, theoretically, you can use up to eight devices (8 x 15W = 120W). However, after calculating the device's power consumption, it is crucial to consider the power consumption of the switch itself. The combined total power consumption of both should not exceed the power budget of the switch to ensure a proper and stable connection.

What devices can a PoE switch power?

PoE switches can power all devices that support PoE functionality, including common devices such as IP phones, surveillance systems, wireless access points, VoIP phones, and any devices compliant with PoE standards. PoE devices streamline network cabling and allow for flexible deployment of devices to desired locations. It's important to note that non-PoE devices can also be connected to PoE but will only provide data transfer functionality without power. If you wish to simultaneously transmit data and power through a single Ethernet cable for non-PoE devices, you will need to use a PoE extender.

Will PoE technology damage my device?

PoE technology is generally safe, but it is crucial to ensure its compliance with standards such as IEEE 802.3af/at/bt and verify compatibility between devices. When adhering to these standards and recommendations, PoE technology is unlikely to damage devices, even if the device lacks PoE support. PoE switches serve the dual functions of data transmission and power supply. Before providing power, a PoE switch emits signals into the network to determine the power consumption requirements of connected devices. In cases where a device does not support PoE, the PoE switch refrains from supplying power but continues to provide data transmission functionality, ensuring the safety of the device.

Conclusion

PoE switches are becoming increasingly prevalent in network architectures, providing both data and power transmission to end devices. This flexibility allows devices to be deployed in any desired location, making it an invaluable feature. While using PoE switches, you may encounter various issues, and the ones mentioned above are just a few common examples. If you have any questions about the PoE switch or PoE technology, please feel free to contact QSFPTEK's CCIE/HCIE engineers at support@qsfptek.com.

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