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What is Power Over Ethernet?

 

If you've been researching office network options, you've probably come across the term "Power over Ethernet" or "PoE." But what exactly is PoE? In short, PoE allows you to transmit both data and electricity over standard Ethernet cables. But there's a lot more to it than that. In this blog post, we'll explain everything you need to know about PoE technology.

 

How Power Over Ethernet Works

First, let's take a look at how PoE works. As we mentioned before, PoE allows you to transmit both data and electricity over a single Ethernet cable. But how is this possible?

 

PoE technology utilizes something called the Medium Attachment Unit, or MAU. The MAU is the component of the Ethernet cable that sends and receives signals. When used in conjunction with PoE, the MAU also regulates the flow of electricity through the Ethernet cable. This regulated flow of electricity is what allowsPoE devices to function. 

 

There are two types of MAUs that can be used with PoE: Media Dependent Interfaces (MDIs) and Media Independent Interfaces (MIIs). MDIs are typically used with copper Ethernet cables, while MIIs are used with fiber optic cables.

 

The type of MAU you use will depend on the type of Ethernet cable you're using. However, all MAUs serve the same basic function: they allow data and electricity to flow through an Ethernet cable simultaneously.

 

 

PoE Class

Now that we understand how PoE works, let's take a look at the different types of PoE technology. There are three main types of PoE: 802.3af, 802.3at, and High Power over Ethernet (HPoE). We'll go over each one in turn so you can decide which type of PoE is right for your business.

 

802.3af is the most common type ofPoE. It's also sometimes referred to as "Standard" or "Regular"PoE. 802 afPoE was first defined back in 2003 by IEEE (the Institute of Electrical and Electronics Engineers). This type ofPoE can provide up to 15 watts of power per port. This is enough power to support most small devices like IP phones, Wi-Fi access points, and security cameras. However, it's not enough power to support larger devices like desktop computers or flat panel displays.

 

802.3atis sometimes referred to as "Enhanced" or "Higher Power"PoE. It was defined by IEEE in 2009 and can provide up to 30 watts of power per port. This extra power makes802 .3at ideal for powering larger devices like flat-panel displays and some types of desktop computers. Keep in mind that not all devices are compatible with802 .3at, so be sure to check with your device manufacturer before making the switch.

 

High Power over Ethernet (HPoE)is a proprietary standard developed by Cisco Systems. HPoE can provide up to 60 watts of power per port, making it ideal for powering large devices like desktop computers, flat-panel displays, and some video phones. Not all devices are compatible with HPoE, so again, be sure to check with your device manufacturer before making the switch. Cisco also offers a midspan injector designed specifically for HPoE compatibility.

 

Conclusion:

As you can see, there's a lot more to Power over Ethernet than meets the eye! We hope this blog post has given you a better understanding of how PoE technology works and the different types that are available. If you have any further questions about PoE, feel free to reach out to our team of experts at Metric Networks. We would be happy to help!