LCD projectors create images through a liquid crystal display and are the most modern form of projection equipment. Overhead projectors are older projectors for hard copy transparencies.
DLP, or Digital Light Processing projectors are of the same generation as LCD and offer high quality resolution and brightness.
CRT projectors are older technology and based on three color light projection.
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These are the network protocols supported by the phone. These protocols provide the phone a 'language' for communication with the network. Make sure this attribute is compatible with existing network devices.
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QoS stands for quality of service. For the most basic audio telephone service, lower qualities are fine. As you require more capabilities of your phone (such as streaming video), high QoS becomes more important.
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VoIP signaling is the protocol used to communicate between the phone and other network devices. Make sure this is compatible with existing devices on your network.
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This describes the type of wire connection the phone uses to connect to other network devices. Make sure this type is compatible with existing network devices.
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There are several different types of digital cameras. Compact and Ultra-compact are light, pocket-sized cameras that are easy to carry, usually with a built-in lens. Standard point-and-shoot cameras are of medium size, usually come with a built-in lens, and have basic features that are useful for the casual photographer. SLR/Professional cameras are usually larger, but offer more advanced features and detachable lenses for the photography enthusiast or professional.
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This is the size and quality of the video image possible using this phone. Image quality depends on the number of pixels, the higher the number the better the quality of the image.
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Display size is the size of the screen. A bigger screen may be more convenient to use, but it will also increase the overall weight of your computer. Screens are measured diagonally across the screen.
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IP Phones often come with attached keyboards. This is the type of keyboard your IP phone has. Numeric keyboards have only numbers, whereas alpha-numeric have both letters and numbers. QWERTY keyboards are standard layout typing keyboards.
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This is how the device gets power. Many devices are powered through their connection to the network (for example, through the USB cable). Others are powered through an AC adapter.
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