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[ELEVATOR WORLD Technology] Laser Optical Video Transmission System for Elevators

Excerpt: In recent years, an elevator surveillance security system has meant using coaxial cable running down most, if not the entire length of the hoistway. The installation and operation of such a system is most often a time-consuming and high-maintenance proposition. A typical installation in an elevator system serving a 40-story hoistway can take four hours and involve three installers. During the installation, the elevator in the hoistway cannot be used by building occupants. In most cases, stranded flex coaxial cable must be used.

The expense does not end with the completion of the installation. Regular maintenance checks are required as the coaxial cable can be damaged due to friction during operation. Cracking in coaxial cable may result in intermittent video feeds and dropped signals, which can result in the need to replace the entire length of cable. Damage to coaxial cable used in hoistways on average occurs within eight months of use. The coaxial cable can also become entangled with hoist ropes, traveling cable and/ or compensating cable that could compromise passenger safety.

A possible solution for these challenges has been developed by Qccess Co., Ltd. (Qccess Technology, Inc., in the Americas). Since 2006, the Korea-based company has installed its Air@-EL300 laser optical video transmission system in a number of high-rise corporate and residential buildings in Korea. In addition, several elevator companies in Korea have started adopting the product for their elevator closed-circuit-television (CCTV) applications.

Specially designed for elevator surveillance security system as an alternative to coaxial-cable installations, Air@-EL300 provides wireless video transmission for hoistways and has an operational range of up to 990 feet, suitable for most high-rise hoistways. It offers real-time transmission of digital images and is compatible with current CCTV systems and their peripherals. A typical installation in the hoistway of a 40-story building requires two installers and one hour.

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