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2024-06-03
Power over Ethernet (PoE) is an efficient technology that enables the transmission of data and power over a single Ethernet cable, significantly saving time and costs for local area networks (LANs). In today's market, you will encounter PoE Switch, PoE+ switch, and PoE++ switch. But what sets these different types apart? This article aims to clarify the distinctions between PoE, PoE+, and PoE++ switches and their respective applications, helping you make an informed choice for your network needs.
PoE technology, established under the IEEE 802.3af standard in 2003, initially allowed devices like VoIP phones to receive up to 12.95W of power using two of the four twisted pairs in Ethernet cables.
As the demand for more power grew, the IEEE 802.3at standard was introduced in 2009. PoE+ provides up to 25.5W of power, accommodating devices like wireless access points that require more than the original 12.95W.
In 2018, the IEEE 802.3bt standard brought about PoE++, which includes two types: Type 3 delivers up to 51W using two or four twisted pairs, and Type 4 offers up to 71W over four twisted pairs, supporting higher power consumption devices.
A PoE switch functions as power sourcing equipment (PSE), supplying power to devices via Ethernet cables. An 802.3af switch can deliver up to 15.4W per port, with connected devices operating within a voltage range of 37V to 57V.
Similar to PoE switches, PoE+ switches supply power over two pairs but can deliver up to 25.5W per port. The voltage range for these switches is between 42.5V to 57V, with a maximum power output of 30W per port.
PoE++ switches represent the latest advancement in PoE technology. They support up to 60W per port under Type 3 and up to 100W per port under Type 4, providing a higher power capacity for more demanding devices.
Here is a reference chart summarizing the specifications of PoE, PoE+, and PoE++ switches:
| Feature | PoE | PoE+ | PoE++ Type 3 | PoE++ Type 4 |
|---|---|---|---|---|
| IEEE Standard | IEEE 802.3af | IEEE 802.3at | IEEE 802.3bt | IEEE 802.3bt |
| Max Power per Port | 15.4W | 30W | 60W | 100W |
| Voltage Range to Port | 44-57V | 50-57V | 50-57V | 52-57V |
| Max Power to Device | 12.95W | 25.5W | 51W | 71W |
| Voltage Range to Device | 37-57V | 42.5-57V | 42.5-57V | 41.1-57V |
| Twisted Pairs Used | 2-pair | 2-pair | 4-pair | 4-pair |
| Supported Cables | Cat3 or better | Cat5 or better | Cat5 or better | Cat5 or better |
The different power capabilities and configurations of PoE, PoE+, and PoE++ switches translate into various applications:
| PoE Switch | PoE+ Switch | PoE++ Switch |
|---|---|---|
| Basic VoIP phones | Advanced IP telephones | Two-way video calls |
| Small wireless APs | Wireless APs with more antennas | Building management devices |
| Stationary security cameras | PTZ surveillance cameras | Thin clients |
| Sensors and meters | Biometric sensors | Remote patient monitoring |
| Laptops and TVs |
Selecting the right PoE Switch depends on your current and future power needs. For devices requiring higher power or if you anticipate expanding your network, PoE+ or PoE++ switches are recommended. Ensure compatibility with your existing infrastructure and specific requirements.For more information, please visit: GZCOM
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