Subtitles of the Movie

Now let's move on the 802.11B standard. The B standard was developed in 1999 and released the same time as 802.11A standard. Again, two years after the original 802.11 was released. Now, the thing about the B standard is it's been more widely adopted as a wireless networking standard due to equipment availability and cost. The equipment costs a lot less and is more affordable by private home users, for example. One thing about the 802.11B is it's not usually compatible with the A standard. Now, you will occasionally find devices that have both standards built in and they can be compatible. They can use both devices, but normally not cross from A to B. Now, the B standard offers speeds considerably less than the A standards do. B standard offers speeds of up to 11 megabits per second, a lot lower than the 54 megahertz per second that A standard offers. The B standard operates in the industrial, scientific and medical frequency range of 2.4 gigahertz. Now, unfortunately, there are a lot of different devices that also operate in that particular frequency range and as such, the B standard is subject to interference from those devices. Normally the B standards are interoperable with the 802.11G standard devices. Most of the B and G standard devices, since they operate in the same frequency range, the devices will use both A and, or rather both B and G standards. So a G standard wireless access point, for example, will talk down to an 802.11B network card. The B standard was the first Wi-Fi Alliance-approved standard. Now, we'll talk about the Wi-Fi Alliance a little later in the course. But it was the first standard that the Wi-Fi Alliance actually approved for adoption and, uh, and helped standardize devices that use the 802.11 B standards. The B standard also was first to introduce some kind of encryption into the wireless network and introduced WEP, or wired equivalent privacy. It was the first wireless encryption standard that we've seen. A couple more things about the B standard that you ought to know are that it uses direct sequence spread spectrum, or DSSS, this type of signaling. Now, the range is also a lot more than the A standard. Whereas the A standard would normally go 30 to 50 meters give or take, the B standard will offer a range of up to around 100 meters give or take.