Glossary
PTZ
Is an acronym for Pan, Tilt, Zoom. It refers to a CCTV camera with movement. For a "dome" style camera the PTZ mechanism is often built into the camera housing versus a traditional camera where the PTZ mechanism is located outside the camera housing, usually underneath with the camera located on top. This isn't always the case however with high-end PTZ cameras available which are fully encased in a solid housing along with the camera itself, bomb proof is also an option.
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IR
Infrared is a part of the non-visible electromagnetic spectrum. Typically used for short range wireless communication it is also used as a form of dark illumination to enhance CCTV images at night.
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VPN
Virtual Private Network. A VPN is a tunnel created over another (transit) network to link two or more sites or points. Encryption is most often used with the Internet being the most common transit network for VPNs. The VPN connection masks the transit network out entirely making the points being connected via the VPN appear as one network.
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LNB
Low Noise Block. An LNB is the device located at the end of a satellite dish to receive high frequency signals. An LNB then converts the high frequency signals to more manageable frequencies in the "IF" range or intermediate frequency. The LNB connects directly to a satellite box in smaller installations or to distribution equipment in the case of larger installations (IRS).
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HDTV
High Definition Television. HDTV is a catch-all acronym to describe various video standards greater than 480p. HDTV compliant therefore does not necessarily mean full HD but does reflect a higher video quality standard than the tradition 'standard TV' 480p.
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VLAN
Virtual Local Area Network. A VLAN enables the logical separation of a physical network switch into groups of isolated networks. This is often done for security, management and other reasons and enables the dynamic reconfiguration of a network and reduced overall costs.
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RS232
Recommended Standard 232 is a form of simple point to point serial communications. Historically used to link data terminals to mainframes it has also been used to connect people to the Internet via modem. RS232 enables a simple way to provide a control interface on electronic equipment from high-end TVs to amplifiers, DVD players and tuners to air-conditioning, lighting and many other types of system.
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LED
Light Emitting Diodes are a low energy light source historically used as indicator lamps on electronic equipment. Modern high-power LEDs are used in luminaries to provide a low-energy light source.
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