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Vertical Alias An alias caused by unfiltered sampling in the vertical direction by scanning lines Vertical aliasing is frequently noticed when reading vertical resolution on a resolution chart The wedgelike lines get finer and finer until they reach the limit of the vertical resolution of the system, but then they may appear to widen or to change position This is caused by lines on the chart sometimes falling between scanning lines and sometimes on them In a properly filtered television system, detail finer than the vertical resolution of the system is a smooth blur Vertical Blanking Interval (VBI) A period during which the electron beam in a display is blanked out while it travels from the bottom of the screen to the top It is the black bar that becomes visible when the vertical hold on a television set isn t correctly adjusted The VBI is usually measured in scanning lines When the VBI is subtracted from the total number of scanning lines, the result is the number of active scanning lines In NTSC, the VBI has a duration of 205 or 21 lines (depending on the field), of which nine lines are devoted to the vertical synchronizing signal that lets television sets know when a field has been completed The remaining lines have long been used to carry auxiliary information, such as test and reference signals, time code, and encoded text, such as captions for the hearing impaired Vertical Resolution The amount of detail that can be perceived in the vertical direction; the maximum number of alternating white and black horizontal lines that can be counted from the top of the picture to the bottom It is not the same as the number of scanning lines It is the number of scanning lines minus the VBI multiplied by the Kell factor (and, where appropriate, the interlace coefficient) Vertical-Temporal Pre-Filtering Filtering at the camera or transmission end to eliminate vertical and temporal aliases When a high line rate, progressively scanned camera is prefiltered to NTSC rates, the resulting image is not only aliasfree but can also be used by an advanced receiver to provide.

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The optimal location for an access point depends on the area you want to cover and whether or not you care if the signal bleeds out beyond the borders You also need to use antennae that provide enough signal and push that signal in the proper direction Omni-directional and Centered For a typical network, you want blanket coverage and would place a WAP with an omni-directional antenna in the center of the area (Figure 16-13) With an omni-directional antenna, the radio wave flows outward from the WAP This has the advantage of ease of use anything within the signal radius can potentially access the network Most wireless networks use this combination, especially in the consumer space The standard straight-wire antennae that provide most omni-directional function are called dipole antennae

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The omni-directional and centered approach does not work for every network, for three reasons First, if the signal exceeds the size of the network space, that signal bleeds out The signal can bleed out a lot in some cases, particularly if your specific space doesn t allow you to put the WAP in the center, but rather off-center This presents a security risk, because someone outside your network space could lurk, pick up the signal, and run software to try to hack into your network Or, a hacker might use your wireless signal for purposes that you might not condone Second, if your network space exceeds the signal of your WAP, you ll need to get some sort of signal booster (see Gaining Gain, below) Third, any obstacles will produce glaring dead spots in network coverage Too many dead spots make a less-than-ideal solution To address these issues you might need to go to other solutions Gaining Gain An antenna strengthens and focuses the radio frequency (RF) output from a WAP The ratio of increase what s called gain is measured in decibels (dB) The gain from a typical WAP is 2 dB, enough to cover a reasonable area but not a very large room To increase that signal requires a bigger antenna Many WAPs have removable antennae that you can replace To increase the signal in an omni-directional and centered setup, simply replace the factory antennae with one or more bigger antennae (Figure 16-14) Get a big enough antenna and you can crank it all the way up to 11!

IPSecurity (lPSec)

Two Modes 996 Two Security Protocols 998 Security Association 1002 Internet Key Exchange (IKE) 1004 Virtual Private Network 1004

vertical and temporal resolution beyond that normally found in NTSC The Kell factor of such a system can be close to one Vertical-Tempered Sampling Sampling that occurs in every television signal because of individual frames (which sample in time) and individual scanning lines (which sample in the vertical direction) This sampling can cause aliases unless properly prefiltered Vestigial Sideband The vestige of a sideband left after filtering

SSL Services 1008 Security Parameters 1009 Sessions and Connections 1011 Four Protocols 10 12 Transport Layer Security 1013

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