A frequently heard term is Power over Ethernet (PoE), but what is it actually? Read it here!
We at Netwerkkabel.eu regularly receive the question what Power over Ethernet, abbreviated as PoE, is.
Here we explain that.
Power over Ethernet allows you to deliver both data and power over a standard Ethernet cable . It can be used to power equipment such as security cameras and VOIP phones. Power over Ethernet is especially useful for equipment that is located far away from a power outlet but still needs power.
It is useful to be able to supply power and internet over one cable to avoid having to pull power cables.
A network cable has eight cores, of which 4 cores are used. The remaining 4 cores can be used for PoE to supply power. A protocol is used to check whether a PoE device is connected and what power is required. The electrical voltage is then supplied via the cable.
The advantage of Power over Ethernet is that devices receive power and data via a single network cable. No additional adapter is needed to power the PoE device. This is especially useful when there is no power outlet nearby.
If you want to power a single device with PoE, a PoE injector is ideal. An injector can ensure that a device is powered by a network cable. This way, you don't have to worry about power outlets.
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If you want to power multiple devices with PoE, a PoE switch is the best solution. This is suitable for a larger number of devices. How many devices you can connect to the PoE switch depends on the number of ports.
PoE switches are available in unmanaged and managed versions. The difference lies in the presence of options for managing the network in the device. A managed switch is equipped with software, with which the management can be arranged. An unmanaged switch does not offer this.
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If you have a device that does not support PoE, you can still power it with a PoE splitter. The splitter is powered by the network cable with PoE.
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PoE can bridge a distance of up to 100 meters if the cable is of high quality and is connected properly. When longer distances need to be bridged, a PoE extender/amplifier is recommended. This can extend the maximum distance by another 100 meters.
PoE technology is known as IEEE 802.3af. This original standard allows a power of 15.4 Watts per Ethernet port. There are several known extensions, as listed below.
|
IEEE Extension |
Type |
Power budget per device (Watt) |
|
IEEE 802.3af |
Type 1 |
15.4W |
|
IEEE 802.3at / PoE+ |
Type 2 |
30.8W |
|
IEEE 802.3bt/UPoE |
Type 3 |
60W |
|
IEEE 802.3bt |
Type 4 |
90-95W |
Important!
It is important that 100% copper cables are used for Power over Ethernet. 100% copper cables conduct better than CCA cables, because there is less resistance.
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