What is the difference between PoE and PoE+?

Power over Ethernet (PoE) and Power over Ethernet Plus (PoE+) are both standards for delivering power and data over Ethernet cables, but they differ in terms of power output and application capabilities. Here’s a detailed comparison:

1. Power Delivery

PoE (IEEE 802.3af):

--- Maximum Power Output (at PSE - Power Sourcing Equipment): 15.4W per port

--- Power Available for Devices (at PD - Powered Device): 12.95W (after accounting for power loss over the cable)

--- Typical Applications: Basic IP cameras, VoIP phones, and low-power wireless access points.

PoE+ (IEEE 802.3at):

--- Maximum Power Output (at PSE): 30W per port

--- Power Available for Devices (at PD): 25.5W

--- Typical Applications: Higher-power devices such as PTZ (Pan-Tilt-Zoom) cameras, advanced wireless access points, and video phones.

2. Voltage Range

PoE:

--- Voltage Range: 44-57V DC

PoE+:

--- Voltage Range: 50-57V DC

3. Power Allocation and Usage

PoE:

--- Power Allocation: Provides enough power for devices with lower power requirements.

PoE+:

--- Power Allocation: Provides extra power for devices with higher power needs, allowing for the use of more advanced or power-hungry equipment.

4. Compatibility

PoE:

--- Backward Compatibility: PoE+ (802.3at) and PoE++ (802.3bt) can power devices compliant with the PoE standard (802.3af).

PoE+:

--- Backward Compatibility: PoE+ can power devices that comply with the PoE standard (802.3af).

5. Cable and Infrastructure

PoE:

--- Cable Requirements: Typically uses Cat5e or higher cables.

PoE+:

--- Cable Requirements: Also uses Cat5e or higher cables, but with the increased power, higher quality cables (Cat6 or Cat6a) are recommended for maintaining performance and reducing power loss.

6. Application Scenarios

PoE:

--- Use Cases: Ideal for basic network devices that do not require significant power, such as entry-level IP cameras, basic VoIP phones, and simple wireless access points.

PoE+:

--- Use Cases: Suitable for devices with higher power demands, such as advanced PTZ cameras, high-performance wireless access points, and devices with built-in heaters or lights.

Summary Table

Choosing Between PoE and PoE+

PoE is suitable for most standard network devices with lower power needs. It is cost-effective and meets the requirements of basic IP devices.

PoE+ should be used when devices require more power, such as high-performance cameras and advanced network equipment. It ensures that devices receive sufficient power for full functionality and additional features.

In summary, PoE+ offers more power and flexibility compared to PoE, supporting a wider range of higher-power devices and applications.