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The traditional WLAN architecture is the multiple-channel (multichannel) architecture (MCA) A multichannel architecture is built with careful planning and maintained over time The 80211 PHYs that operate in the 24 GHz ISM band provide three nonoverlapping channels In the United States, the nonoverlapping channels are 1, 6, and 11 I ll focus on the 24 GHz band here to make the explanations simpler The 5 GHz U-NII bands offer many more nonoverlapping channels with 80211a and 80211n Strategically configuring APs to use these channels and then staggering the channel usage throughout a coverage area allows complete coverage of larger areas As an example, consider the simple floor plan in Figure 11-1 Assuming this entire single-floor building needs coverage, multiple APs will be needed In order to provide the highest data rates to all users, APs will be installed and power levels will be adjusted accordingly MCA plans are often depicted with hexagons to represent the coverage of each omnidirectional antenna and AP pair In the real world, antennas do not ever propagate the signals in a perfect hexagonal shape; however, the hexagon shape is useful as an early planning tool Figure 11-2 shows a potential plan for covering the floor plan represented in Figure 11-1 As painful as it is to look at, Figure 11-3 shows a more realistic view of an implementation pattern using MCA plans As you can see, the coverage area (cell) created by each antenna/AP pair is not a nice, clean hexagon matching up perfectly with another cell Instead, they form an ugly overlapping pattern that gets the job done

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As you know, Darwin (and its Mach kernel) is the core operating system of Mac OS X Mach kernels use and implement processes and threads differently than most other UNIX implementations In many UNIX monolithic kernels, the basic level of scheduling is the process, where all threads within the process are bound by the scheduling priority of the process; when a process is suspended by the operating system, all its threads are also suspended Under Mach, the thread is the basic execution unit, not the process Thus, under Mach, scheduling priority is handled on a per-thread basis: the operating system coordinates and schedules threads from many different tasks Using Thread Viewer The Thread Viewer program displays a graphical representation of the interaction of your application s threads, as well as providing information on a per-thread basis.

11:

billboard on the highway, and they d look at it That s not true anymore This year, the average consumer will see or hear 1 million marketing messages that s almost 3,000 per day No human being can pay attention to 3,000 messages every day This is called, as you might be able to guess, interruption marketing your attention is captured because your routine activity is interrupted But with 1 million messages a year, this doesn t work the way it did in the 1960s You do what I said above you just zone out This isn t just some construct that is there to move things in this book forward a bit While you might think that your business competes with other companies who put out like products and provide like services, the stark reality is that you compete with every single message being thrown at your prospective customers You can t even start a smart legitimate marketing campaign aimed at lead generation without capturing the attention of your prospects first This is a recognized problem Howard Handler, the chief marketing officer of Virgin Mobile USA, understood it in 2008 when he said, To cut through with a message or a brand or a piece of content is more challenging than ever The underlying idea in Handler s comment is that because the amount of attention a consumer can give a product or service or company or idea is finite and increasingly more difficult due to both bad information like spam and rich information sources available everywhere, the competition for that attention is increasing and attention is becoming a commodity Customers are so tired of being bombarded (aren t you ) with this constant barrage of messages that they simply zone out and don t want to give their time or consideration to companies they might otherwise be interested in What they actually want and are beginning to accomplish is control over what messages they consider taking and what brands they allow into their homes Attention is given so little at this time that it s been commoditized by its scarcity Evidence of this commoditization of attention is pretty easy to find It shows in the compensation that is often given if you ll just watch something For example, when you watch a TV show that you ve had queued in Hulu (the web-based service that s either owned by NBC, Disney, and News Corp or by aliens who look like Alec Baldwin and Dennis Leary), you will often get a choice of watching commercials that run at regular interludes through the web broadcast or seeing a single one-minute commercial at the top of the show For your attention.