Explore the PoE WAP configurations, where they are used, and their requirements.
- I've got a couple of wireless access points here in front of me, but I want you to look at these really, really closely. First of all, take a look at this guy right here. Now, as a wireless access point should have, it's got an RJ-45 connector and you'll also see that it has a power attachment so I can plug an A/C adaptor into this guy. Well that's fantastic but I want you to now look at this guy that I've got right here in front of me now. Notice that this fella doesn't have an A/C adaptor connection.
This fella right here doesn't need, in fact can't use, an A/C adaptor. But you would say, well, Mike, it needs electricity and it most certainly does. It's taking advantage of an 802.3 standard called Power over Ethernet. When you have a number of devices and you're putting 'em up on walls and everything, it's a real hassle to have to come up with a way to get an electrical cord up there so that you can power these things. So it's very common with wireless access points, particularly in more enterprise environments, to take advantage of Power over Ethernet.
Power over Ethernet simply means that you have to have a wireless access point that's capable of it. And by the way, even that first one I showed you can use Power over Ethernet, you just unplug the adaptor. So you have to have a wireless access point that can do PoE and you also have to have a switch that is PoE-capable. Now I don't have a PoE switch on me right here, but here's a picture of one to give you an idea. Now this particular switch, you'll notice that some of the ports have yellow underneath them. Those are PoE ports. They work just like any other switch port, except they also provide power through the actual cable to the individual devices.
So Power over Ethernet is extremely convenient. Now, if you don't have a PoE switch, you can get something like this. This is a PoE injector. The idea behind a PoE injector is, you've got a cable running from your switch and this switch is not PoE-capable. Get the idea? And it runs into this guy and then it runs out to your PoE-capable wireless access point. So an injector, he needs to have power.
Whoop, look how new it is. So the injector has to have power because your switch doesn't have the power, therefore you can use an injector. This is pretty common. A lot of people, when they're putting up just one wireless access point, instead of buying a whole PoE switch, they'll just grab an injector, use that to give that one wireless access point PoE power and everything's great. Now PoE's been around for awhile. The original PoE standard was 802.3af. The 802.3af was a great standard.
It worked beautifully, except it had one problem. It had a maximum wattage of about 15.4 watts. Now that may sound like a lot to you and me but it's not enough to run the later generation, more powerful wireless access points. So a new version came out, known as PoE+. PoE+ runs on the 802.3at standard and pumps out a whopping 30 watts, which so far is more than enough to make any device run just fine using PoE.
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- Implementing wireless security
- Threats to your wireless network
- Wi-Fi Protected Setup
- Installing a wireless network
- Cloud ownership and implementation
- Creating a virtual machine
- PaaS, SaaS, and IaaS
- Mobile networking
- Deploying mobile devices