Power over Ethernet

8 minutes
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All righty. Power over Ethernet. This has been the mystery for quite a while for some people, there's no mystery about it. Okay, we're gonna dispel that right now. You can power something three different ways not something in this case the switch right through an external IC adapter okay? Put on a power injector which connects to an AC near the Ethernet switch and provides DC power or here.

Here's a here's a power injector wire. Okay. I myself have never used a power injector. I've never had the need to okay. So but if you have the need and they want to use power or Ethernet, then they will need a power. Well you want to power that switch for whatever reason.

There you go. In your power injector. Now Association about providing DC power, isn't it for the Most part okay. And this is a POV switch your pure switch has to be designed for this. Okay, I will talk about it a little bit later. But this is a Cisco switch and is graded.

It is stamped seal of approval for Power over Ethernet meaning the same Ethernet cable that you use on your network, you're going to be able to power this particular switch, okay. So you may not you may not need a power injector or anything silly like that. I can tell you this again Intel telecommunications a router or switch a router. I was looking for the plug to plug it to put it into I was like Hey what happened? And he's like no, no, no, we have put the actual wires because it has two little screws in the back the actually put the wire for electricity on there, say man, only my electrical and electricity licensing, whatever. But that's just the way it is.

AC is DC Okay, that's all it is. But power return it pretty much all switches support that okay. Now prefer method use a 48 DC supply is provided to a device over the same UTP cable that has been used by either network I decided that okay and the DC power source is the catalyst switch the switch is great it is stamped says hey, this is able to run power even it can handle the load not only to send data through there, but to power up devices as well. Yes, okay, you can use it that will be preferred. How does it work, the switch must be designed for POV so if you're going to use POV purchase a POV switch, find out before you purchase, it must have one or more power supplies that are rated for the additional load that will be offered to the connected devices.

Okay, here is available on pretty much all switches or you can get a Cisco in line Power. Okay, let's move on power is a property method that was developed before the IEEE standard. All right, I don't know if you use the pirate tracer but in the fire tracer, you see the IP phones, you see that you have this adapter. That's called an inline power adapter. Okay, so again you can use something like that. So there's many ways of doing it, but obviously the best way is just going to switch the supports POV All right, we're gonna go through all this hassle of getting injectors and all know your switch handles POV and that'll be that.

Okay, now here are this let's go in line power adapter. It only has seven watts. That's it. Okay, the algebra two three AF which is purely yeah 50 watts much better feeling plus is 25.5 watts. Here. Since is triple I triple E. I mean this little table right here.

I suggest that you look over it several times. logo or soul time is that bad. Okay, it really is it's pretty small. And just remember, you know, the wattage isn't what I mean this is the deviation to this alright Cisco inline power adapter does have a seat in front of it, it was an inline power adapter. Alright, this is a if there's a t bo AP plus 25 watts, okay. And Cisco universal POV okay now handle 60 watts it can handle anything.

Alright, so if asked which will will probably be a multiple choice question if asked, okay, you know, which would you use to handle a huge load of equipment blah blah blah, Cisco universal POV which can handle 60 watts of power, okay. Or the next best would be able to 380 right, which is a POV plus can do 25 watts. So that's able, I suggest you take a look at it. Take a look at it will be made available to all right. Detecting powered devices you need to know that goes, you can look in the switch using your show commands, take a look at the powers. So just keep the power disabled.

When the port is down, however, the switch must continue to try to detect whether a part device is connected to a port, there is a command that you do type to take a look to see. And we'll look at it we'll be doing a lab so you can see the command and you see that we're going to connect an IP phone and you're gonna see the wattage right there. So it's important to know that you need to know that before when I started it. I didn't care what the wattage was. Big mistake, huge mistake. All right, because you need to know the wattage just for the fact of getting a UPS how many watts Am I running that I can plug things into me a server alone is a big server is going to take a lot of watts writing maybe 500 watts, okay, we're pretty close to that.

So you gotta make sure that you're getting the right feel we fight for what you're doing and then when you look at how much wattage these devices are pulling, I, you'll you'll say, oh wait a minute, I'm reaching my max limit here, what can I do or what should I do? Okay, so definitely, the switch will begin supplying small amounts of power across the UTP cabling on the connection. He knows to do this because it measures the resistance on the port 25 k ohms resistance power device is present how much power it says is based on the power class, there is a little table that we have, okay, and these are the different classes, these are the values he has, you know, two 380 which is up to 30 watts 25.5. Was it 25.5 but you have different classes and how much max they can hold.

Okay. But again, when you're looking when you're doing your show command, and you look at that you're going to see that are you going to see that this device is pulling how many watts is important to know that is important to know that or you can set the max yourself high In line out, oh, Max 6000 Oh, thank you. So it's an area milliwatts. It's a milli watts 6000 milli watts. If you're getting any error messages, this will be six watts, if you're getting any error messages and insufficient power, so we change it to 15,400. So maybe this can do more, man, you don't have enough power to run a device, you need to increase it.

Alright, so there's a reason why you want to look and see what's going on in there. Again, it will be a show command that you would do. All right, I will be sure power in line what the interface admin operational power device class max. Again, you take a look at the commands that your iOS permits you to look at so you can see how much power is being pulled. When it comes to Power over Ethernet. It's not that it's tricky.

It's just like anything else in networking. You got to buy you going to purchase the correct type of equipment for what is it that you're doing Okay, and then the wattage, okay, what devices are going to be connected to the network that this particular device is going to be able to handle. That's why you have your standards, your classes, and what wattage they can hold, what waters they can hold. That's basically it for that. But either way, I will see you in the next which is going to be alive and we'll take a look at those particular commands. I'll see you there.

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