Direct Sequence Spread Spectrum Part4 Now, after the data has been encoded using the chipping method, the transmitter is going to need to be able to modulate the signal to create the carrier signal that carries the chips. Now, we’re going to use something like differential binary phase shifting dbpsk to be able to use phases or at least two phase shifts. One that represents a zero chip and another that represents the one. Now, I hope you remember when we talked about phase shifting. That when we saw a…

Hopping Sequence So the hopping sequence that I was just talking about is very well published. And so that means they had a predefined hopping sequence. I mean, really, if you think about it, if I had some antenna that was transmitting on different channels, hopping from one to the other to a receiver. And remember back in the day when I was working with this, when it first at least arrived in my life, it was on the 900 MHz range, and it was about putting what they called…

U-NII Review So when we talked about uni, as I said, was kind of a grouping of channels in a different frequency range that we could use for different purposes, whether it was data or TV. And so you see that we have uni one which is really at the start of the 5. 0 GHz that took up the first four channels. Most often we use that for data communications, but like I said, we could send other transmissions over these unlicensed bands. The uni two of course, was…

Spread Spectrum Technologies This module is on the spread spectrum technologies that we’re going to look at. And that means we’re going to talk about things like the Ism bands, the ones that are unlicensed, calling them the industrial, scientific and medical. We’ll talk about the uni bands that exist within those unlicensed portions. Then we’ll look at concepts like narrow band, spread spectrum. Then we’ll look at some of the encoding methods that we use, like the FHSS, the DSS, the OFDM, and how those apply to the different…

Site Survey Tools In this module, we’re going to take a look at some of the tools that you can use to help you with a site survey. So we’ll talk about really the definition of what you should be doing in a site survey. We’ll look at those tools and how they can help us with what we call a coverage analysis. Protocol and Spectrum Analysis When we take a look at history, like ten years ago, if you were going to plan or design for a wireless network,…

Robust Security Part7 So protecting data privacy on a wired network is a lot easier because of the physical access to the wired medium. In other words, it’s not radiating radio frequency for anybody with an antenna to be able to hear. So it’s a little more restricted. In fact, you actually probably have to be into the server room. For some of you. With smaller networks, you might call it the closet, but it’s much more restricted, whereas wireless transmissions are available to anybody who is close enough to…

802.11 Security Basics Part5 Now, when we continue to talk about security, something else we should look at is segmentation. And that’s what happens when we get on the wired network. segmentation is our best method, the most chosen method of separating user traffic while inside of a network. We most often do that with what we call a virtual local area network. And so it’s a layer to switching technology to make sure that traffic gets isolated lated from one part of the network to another part. Now, you…

Security Now in this module we’re going to take a look at security when it comes to the wireless networks. So we’re going to first give you the security basics. We’ll talk about some of the legacy. Not a lot because it’s legacy for a reason. It doesn’t work anymore. We’ll look at this thing called the rsn, the robust security network which is really important to us. And then after we leave the wireless network and get into the wired network we’re going to talk traffic segmentation, infrastructure security…

PoE So in this module, we’re going to have a discussion about power over ethernet and why that’s important to us in our wireless setup. First, I’ll give you a little bit of a history about poe that’s again the Power over ethernet. We’ll talk about the devices as an overview and what we can do to plan and deploy having power over ethernet. Non –Standard So as with most of our technologies, the initial poe products were proprietary solutions created by the different companies that recognized that there had…

Beacon Frame Types So, as I was just saying, some of the things that we see with the beacon, well, things I didn’t even mention yet, the timestamp to synchronize to make sure we know what time of day it is and it’s not some weird repeated traffic or something like that. The type of again, spread spectrum am I supporting? FHSS, DSS OFDM ERP, all these things we’ve talked about, the channel that I’m using, the data, data rates, the ones that I have, basic rates, ones that were…