Power Over Ethernet Switches - PoE - Power to the People & and Devices
Visit our PoE Switches on the NETGEAR Power over Ethernet Switches page.
Power over Ethernet (PoE) is a networking feature defined by the IEEE 802.3af and 802.3at standards. PoE lets Ethernet cables supply power to network devices over the existing data connection.
PoE-capable devices can be power sourcing equipment (PSE), powered devices (PDs), or sometimes both. The device that transmits power is a PSE, while the device that is powered is a PD. Most PSEs are either network switches or PoE injectors intended for use with non-PoE switches. Common examples of PoE devices include VoIP phones, wireless access points, PoE Security cameras and high-efficiency PoE Lighting.
What are the benefits of PoE?
- Save Money with PoE: PoE allows you to use one cable for both power and data transmission, PoE saves you money on purchasing and running cable for networking equipment and VoIP phones.
- Easy Installation with PoE: PoE makes installing or expanding a network much simpler and cheaper in buildings where it is too expensive or inconvenient to install new power lines.
- Put PoE Virtually Anywhere: Using PoE lets you mount devices in places where it would be impractical to install power, such as drop ceilings.
- Save Outlets and Infrastructure with PoE: Using PoE can reduce the number of cables and electrical outlets needed in a crowded equipment room or wiring closet.
What is PoE+?
The latest update to PoE is the IEEE 802.3at standard, known as PoE+. The major difference between 802.3af (PoE) and 802.3at (PoE+) is that PoE+ PSEs can provide almost twice as much power over a single Ethernet cable.
How much power can PoE devices supply?
PoE+ devices can supply a maximum of 30 watts per port, while PoE devices can supply a maximum of 15.4 watts per port. However, some power is always lost over the length of the cable. PoE compliant devices will take this into consideration. PoE Supplies 48v DC to devices.
PSEs also have a maximum power budget, which is the total amount of power they can supply to PDs at one time, measured in watts. Most PoE Ethernet Switches do not have a high enough power budget to supply the maximum possible power to all PoE-capable ports, because most users do not require that much power. When you are shopping for a PoE-capable PSE, make sure that you calculate your required power budget carefully for all of the PDs you plan to connect.
A new standard for PoE is currently in development 802.3bt that will bring a maximum of 90W of power to each device.
What do the PoE Classes mean?
PoE and PoE+ powered devices are assigned a class from 0-4 based on how much power they require. When a PD is connected to a PSE, it provides its class to the PSE so that the PSE can supply the correct amount of power to it. Class 1, Class 2, and Class 3 devices require very low power, low power, and medium power, respectively. Class 4 (PoE+) devices require a high amount of power and are only compatible with PoE+ PSEs. For more information about PoE classifications we recommend the PoE Wikipedia Page.
Can I mix PoE and non-PoE devices in my network?
PoE devices can be mixed in a network with non-PoE devices, but non-PoE devices cannot provide power for PDs or be powered by PSEs. The non-PoE devices must have a separate source of power.
PoE Switches or PoE Injectors what is the difference
We recommend adding a NETGEAR PoE switch to your network vs using an injector to add power “in-line” to an existing network cable. Similar to a switch, an injector it has its own power-supply, but only outputs power on 1-2 unmanaged network hub ports. With a PoE injector both your existing switch and your injector will have power supplies. This adds complexity, security concerns and points of failure to your network.
Which NETGEAR switches are PoE-capable?
NETGEAR has a large variety of PoE Switches ranging from small unmanaged PoE Access Switches to large deployment 96 port PoE Managed Switches. Any NETGEAR switch with a letter “P” after the model number but before the hyphen (-), including “LP” and “PP”, is PoE-capable: for example, GS308P, GS728TPP, GSM7252PS.
Find the PoE-capable switch for your deployment with the NETGEAR Product Selector for PoE Switches:
- Click the + next to Power over Ethernet (PoE) requirements.
- Select the check box for each applicable PoE option.
- Narrow down your choices using the other selection categories, such as Form Factor and Supported Link Speeds.
- To view more information about a specific model, hover your mouse over that model and click VIEW INFO.
For the latest info on Power over Ethernet Switches, visit our PoE Knowlegebase Article.
Additional helpful PoE Power Over Ethernet Blogs: