What is Power Over Ethernet(POE)

In this Artical, we will learn what is power over Ethernet technology, which is also commonly known as a PoE.

And we will also see some standards which are used for this power over Ethernet technology.

Now, as we know, ethernet is the networking protocol, which is used to establish the local area network or a Len.

And data is carried using the network cables or other cables. Now in Poe or power or ethernet technology, along with the data power can also be carried on this ethernet cables and using this different network devices can be powered up.

So now generally the network device, which require less power are powered up using this power over Ethernet technology.

So the IP phone wireless router and the IP cameras are the example of the network devices, which can be powered up using this powerover ethernet technology.

And today, if you see this power over ethernet technology, so established that millions of devices in the world are powered up using this technology.

Now, there are several advantages of using this power over ethernet technology. Firstly, you don't require additional wires to power of this network devices.

And second, you can also install this network devices to the inaccessible locations, where it is difficult to provide the power supply.

So using this power or ethernet technology, it is possible to maximize the saving on the installation cost.

Now there are several techniques for transferring the power over ethernet cables, which are defined under some police standards.

And here is the list of the ID police standards, which are commonly used for transferring the power or this ethernet cables.

Now under this standards, several things are defined like how much maximum power can we transfer or this ethernet cables.

what should be the length of the cable or which we can safely transfer the data or what should be the maximum voltage or current, which can apply over these ethernet cables.

Basics

So now before we see about the standards, let us, first of all, understand some basic DOE terminologies.

So the equipment which supplies the power to the network devices is known as the power source equipment or PAC and the network devices, which receives the power over the ethernet cables are known as the power devices.

So now before supplying the power to these network devices, the first thing that PAC check is whether these devices are Poe enabled or not.

And to check that this PAC sends the signals in form of voltage to these power devices. And in response, it receives the signature of this power devices, which is nothing but the resistance across this power devices.

Now every power device has some ethernet resistance, which is isolated from the main circuitry.

And once the signature detection procedure gets completed, and if power device is eligible to receive the power from the PAC, then actual circuit will get exports to this power source equipment.

So now, if the resistance that is detected by this PAC is in the range of 19 kilom and 25 kilom.

Then this power device is eligible to receive the power from this power source equipment.

And if this resistance is less than 15 kilometers or greater than 30 kilom, then this PAC will not supply power to this power devices.

That means this power device is not eligible to receive the power from the power source equipment.

So now this entire signaling procedure for detecting the resistance across this power device is known as, It's to power discovery.

Now the entire signaling procedure is defined under this IEEE 8.2.3.8 standard.

So now once this procedure gets completed, the PAC finds out how much power is required by the power device.

And to find that it applies a specific voltage to the power device and in the response, it receives the current that is flowing through this power device.

So in this way, the power source equipment decides how much power should get supplied to this power device.

So under IEEE three dot years, the maximum power which can be supplied by this PAC is 15.41 volt And the maximum power which can be received by the power device is 12.95 volt.

And obviously there is refuge power will be less compared to the supplied power because some of the power will get lost across the cable resistance.

So now let us find out how this Poe enabled network switch is connected to the power devices like IP camera using this ethernet cable.

So now if the network switch is enabled, then we can directly connect this power source equipment with this power device, like a IP camera.

So if the switch is BOE enabled or in another words, if it cannot supply the power to the, our devices, then you will require the another device, which is known as the mid span.

So this mid-span adds the capability to the standard networking switch. And if you see the wiring arrangement of the ethernet cable, it will look like this.

So the data pairs will go as it is, and power is supplied by this Mud Span or the spare pairs.

So now, if you don't know about the ethernet cable wiring, the ethernet cable has an eight number of wires and under the 10 based network and the 100 based networks out of these eight wires.

Only four wires or two, two straight pairs are used for the data communication.

And four wires are remains as a spare while in the case of a thousand ways to network or a gigabit ethernet network, all the four pairs are used for the data communication.

So now there are two possibilities or two different types in which we can provide the power or this it's an it cable.

The first method is known as a type B or alternative B method in which power is supplied over the spare of this ethernet cable.

While in case of a type a or alternative third, the power is supplied on the same pairs over which the data is carried.

And this technique is known as the fandom power fit technique. So now, as I said earlier, three different standards exist for this power over.

It's an it technology. So now we have already discussed about this first standard. That is it IEEE eight dot, two dot three dot AFF or reach the maximum power, which can be supplied by the PAC is 15.4. wolt.

If you see the second standard, which is also known as the Poe plus, or which the maximum power which can be supplied by the PAC equipment is 30 ward vile.

If you see the third standard, the third standard can support up to maximum a hundred wat of power at a PSCN.

But this standard is still under the development phase and this standard can be used for the exhibit.

It's a network. So as I said earlier in the gigabit ethernet, all the four peds are used for the data as mission. So under these standard, the power will be carried on the, all the four pairs of the extended cable.

And as all the four pairs are used for the power transfer, the maximum power, which can be delivered across the power devices will be also more so now once the devices or the standard will be conversely available.

We can use them to power up not only the IP cameras, but even the led bulbs at our house or at our offices, or maybe it can be used to power up the POS 10 mils at the billing counters of the shopping malls.

So these are the different classes of the power that is supported by these three different standards.

And according to the standard that is supported by this power devices, these power devices are classified under the four different types.

And here is the complete list of the different properties of what is standard, like

what should be the maximum voltage
What should be the maximum current
what should be the maximum cable resistance and many other things under particular standard.

So I hope in this Artical, you understood what is power over ethernet technology. So if you have any questions Comment now.

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