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What is a PD in Networking?

September 18, 2025

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In the world of Power over Ethernet (PoE) , the term PD is commonly used.

But what does it actually mean?

Understanding what a PD in networking is and how it functions is essential for anyone working with modern IP networks, surveillance systems, or industrial IoT deployments.

 

What is a PD in Networking?

 

PD stands for Powered Device. In networking, a PD is any device that receives both power and data through an Ethernet cable from a Power Sourcing Equipment (PSE), such as a PoE switch or PoE injector.

Examples of PDs include:

In short, the PD is the endpoint device that consumes power delivered by PoE technology.

 

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How Does a PD Work?

 

A Powered Device (PD) connects to a PSE via a standard Ethernet cable (Cat5e, Cat6, or higher). Here’s how the process works:

This process is governed by standards such as IEEE 802.3af (PoE), IEEE 802.3at (PoE+), and IEEE 802.3bt (PoE++), which define the maximum wattage available for PDs.

 

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Benefits of Using PDs in Networking

 

 

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Common PD Applications

 

Powered Devices (PDs) are widely used in different industries and environments:

 

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Conclusion

 

In networking, a PD (Powered Device) is any endpoint device that receives power and data from a PoE-enabled switch or injector. By eliminating the need for separate power adapters, PDs simplify installation, reduce costs, and offer flexibility in deploying modern network infrastructure

Whether it’s powering IP cameras, VoIP phones, or wireless access points, PDs are a critical part of today’s PoE networking ecosystem.

 

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