Explanation and Applications of PoE Technology

In modern network architecture, POE (Power over Ethernet) technology allows devices to receive power through Ethernet cables, significantly reducing wiring complexity and installation costs. This article delves into PoE and its related technologies, including PoE+, PoE++, UPoE, and PoH, providing detailed definitions, technical specifications, applicable devices, and scenarios.

1. PoE (Power over Ethernet)

Definition: PoE is a technology that delivers power over Ethernet cables, compliant with the IEEE 802.3af standard.

• Maximum Power: 15.4W (maximum power from power sourcing equipment to powered device)
• Voltage Range: 44V-57V
• Transmission Distance: Up to 100 meters (328 feet)
• Cable Category: Cat5e and above

Applicable Devices and Scenarios:

• IP Cameras: Simplifies wiring for surveillance systems.
• Wireless Access Points (APs): Enhances deployment flexibility for both enterprise and home networks.

2. PoE+ (802.3at)

Definition: PoE+ is an upgraded version of PoE, compliant with the IEEE 802.3at standard, supporting higher power output.

• Maximum Power: 30W
• Voltage Range: 50V-57V
• Transmission Distance: Up to 100 meters
• Cable Category: Cat5e and above

Applicable Devices and Scenarios:

• High-Definition Surveillance Cameras: Ideal for indoor and outdoor monitoring requiring higher power.
• VoIP Phones: Provides improved audio quality and functionality, suitable for enterprise environments.

3. PoE++ (802.3bt)

Definition: PoE++ further increases power output, compliant with the IEEE 802.3bt standard, divided into Type 3 and Type 4.

• Type 3 Maximum Power: 60W
• Type 4 Maximum Power: 90W
• Voltage Range: 50V-57V
• Transmission Distance: Up to 100 meters
• Cable Category: Cat5e and above

Applicable Devices and Scenarios:

• High-Power Devices: Such as large wireless access points, video surveillance systems, and digital signage.
• Smart Lighting: Supports dimming and other smart features, widely used in commercial and public spaces.

4. UPoE (Universal Power over Ethernet)

Definition: UPoE is a technology proposed by Cisco, supporting higher power output.

• Maximum Power: 60W
• Voltage Range: 50V-57V
• Transmission Distance: Up to 100 meters
• Cable Category: Cat5e and above

Applicable Devices and Scenarios:

• Multimedia Devices: Such as high-performance audio systems and video conferencing equipment, suitable for corporate meeting rooms.
• IoT Devices: Requires higher power for sensors and actuators, applicable in smart cities and industrial automation.

5. PoH (Power over HDBaseT)

Definition: PoH is a technology that delivers power via the HDBaseT protocol, primarily used for high-definition video transmission.

• Maximum Power: 100W
• Voltage Range: 48V
• Transmission Distance: Up to 100 meters (using Cat5e or Cat6)
• Signal Transmission: Supports simultaneous transmission of video, audio, Ethernet, and control signals.

Applicable Devices and Scenarios:

• Home Theater Systems: Integrates power and signal transmission, ideal for high-end home theaters.
• Commercial Displays: Used in advertising and information displays, supports long-distance power supply.

Conclusion

PoE and its related technologies provide flexible and efficient power solutions for modern network devices. Selecting the appropriate PoE standard based on the power requirements of different devices can significantly enhance network system performance and reliability. As technology continues to evolve, the application scenarios for PoE will expand, leading to more intelligent power solutions for future networks.