cwts certified wireless technology specialist official study guide exam pw0 070 phần 8

C. công nghệ Dải phổ quang rộng gửi các dữ liệu về tần số sóng mang con nhiều. Công nghệ băng hẹp không được sử dụng trong các mạng WLAN IEEE dựa trên nhưng được sử dụng trong các chống bị nghe lén. Như đã thảo luận, cơ chế mã hóa này được coi là di sản và đã bị xâm nhập, | Performing a Predictive Site Survey 307 Client Device Such as a Notebook Computer A device to take measurements from the client side is an important component of the site survey kit. This can be a notebook computer or Pocket PC with appropriate software to take signal measurements. Size and weight should be considered as well. A Wi-Fi VoIP handset may also be used for locations that are considering WLAN Voice over Internet Protocol capabilities. Battery Packs or Extension Cords Battery packs to temporarily power access points are recommended. However if these are not available extension cords are a good substitute. The disadvantage of extension cords is that they require accessible AC power outlets which might not be available at all sites. An extra battery pack for the survey device is also recommended. Various Antennas If Required If antennas other than those mounted directly to an access point will be used in the deployment a variety of these antennas should be on hand for testing during the site survey process. If technology will be tested during the site survey appropriate antennas will be required as part of the site survey kit. Temporary Mounting Hardware Mounting hardware for temporarily mounting access points and antennas should also be considered including expandable poles brackets tape and nylon tie straps. Measuring Device Either Tape or Wheel A measuring tape or wheel is recommended for measuring distance to wiring closets and distance between access points and any other areas where distance is of importance. Digital Camera As they say a picture is worth a thousand words. Using a digital camera to take photographs of situations that may be difficult to explain in writing is a great help. This also adds quality to site survey reports. Pens Pencils and Paper Documentation is a critical part of wireless site surveys as well as all other areas of the network. Keeping clean and accurate notes will allow the surveyor to document areas of .

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