Subtitles of the Movie

First let's talk about the 802.11A standards. Now, the A standards were originally developed and published in 1999, two years after the original .11 standards came out. It also came out the same time as the B standard. Now, A differs from B in many respects. First of all, it uses the 5.0 gigahertz band of the unlicensed national information infrastructure band. This band is usually reserved for commercial use and unlicensed, uh, radio use. It offers speeds of up to 54 megabits per second. This is vastly more than the original standard of one to two megabits per second called for. It's different from B also in that it uses orthogonal frequency division multiplexing, or OFDM, where there are carrier waves sent out and each wave, each carrier wave carries a small part of the message with it. Now, normally the 802.11 A standards are not inoperable with other standards, although you can find devices that will operate in both A and B and G. They just have different components built into them so that they can do this. Now, one of the good things about the A standards is it's not subject to interference from other wireless devices such as cell phones, microwave devices, anything that operates in the same frequency range as 802.11 B and G due to its different frequency range. So it's a lot more prone to, uh, resistant, rather, to interference. The one thing you should know about the A standard is it's a little bit more expensive that the 802.11B. When it first came out, the equipment was just a tad more expensive and that kind of led to it being less widely adopted than the B standard. The B standard was far more popular. It was also slowly adopted in Japan and Europe due to the lack of international standards for use for that particular frequency band, the 5.0 gigahertz frequency band. Some of the rules were a little bit different in Japan and Europe concerning the management of that particular frequency range. Now, the other thing about the A standard too is that the range is a little smaller than B and G. Thirty to 50 meters. So as you can imagine, A normally has some specialized uses. It's not generally used in, in the public sector in terms of private home use and things like that.