Since the end device is supplied with power by the LAN cable, you no longer need a power cable and thus reduce the tangled cables.
A brief introduction to Power over Ethernet
What advantages does Power over Ethernet offer you?
There is no need to lay power cables when setting up a (PoE) network. This saves you the cost of a certified electrician and the additional cable.
Since you are no longer limited by sockets, you can place your end devices freely. LAN cables are easier to lay in false ceilings than power cables.
You can expand your existing network with PoE injectors without having to replace the current Ethernet switch.
There is a large selection of PoE accessories such as PoE Switches and PoE Injectors, with which you can set up your network optimally and individually.
Which PoE method is the right one for your end devices?
In addition to the PoE standards, there are two basic methods of how PoE devices interact with one another. A distinction is made between passive PoE and active PoE devices.
With the active PoE method, the energy supplier (Power Sourcing Equipment / PSE) carries out a brief check as to whether the end device (Powered Device / PD) is PoE capable or not. If it can be charged via PoE, then data and power will be available via the network cable. If the end device is not PoE capable, only data is sent to the device.
A short example: You connect a non-PoE capable laptop to a network cable. The PSE, which uses the Active PoE method, sends a short signal to check whether the laptop is PoE capable. This signal, a short “handshake”, will tell the PSE that the laptop does not support PoE and only data will be transferred.
With the term Passive PoE we do not mean the passive PoE standard in this case. This refers to the method of communication between PSE and PD. With the passive PoE method, the data and power are continuously transmitted from the PSE to the PD. No check is carried out to determine whether the PD is PoE capable.
Again to our example: The laptop that you connected to the network cable is still not PoE capable. You now connect your network cable that comes from your passive PSE. That means, data and electricity are transferred to the laptop. But your laptop doesn’t know how to handle the electricity. You run the risk of a short circuit in the laptop.
What to look out for …
There are now many end devices (PDs) that can receive power and data via the network cable. These devices are PoE capable, so there is no need for a further element, apart from a PoE Switch or PoE Injector, to supply your device with power via PoE.
Non-PoE capable devices are not able to use the power that comes over the network cable. So if power is to be transmitted over the network cable and the end device (PD) is not PoE capable, you run the risk of a short circuit.
It may still be possible to supply a non-PoE capable device with power via PoE. Depending on the PD, a PoE Adapter or a PoE Splitter is required for this.