Security FAQ's

A. 75 Ohm

Q. What does C.C.T.V. stand for?

A. Closed Circuit Television

Q. What is a lanyard?

A. A lanyard is a break away chain that holds an i.d.

Q. What are the differences between a fail-safe and a fail-secure lock?

A. Fail safe makes sure the door stays unlocked if power is comprimised; and fail secure makes sure the door stays locked if power goes out.

Q. When is plenum cable recommended?

A. Plenum cable should be used when the ceiling is used as an air return. The reason is to prevent poisonous gases from being sent throughout the building.

Q. Is shielded cable needed for use with an intercom system?

A. Shielded cable is highly recommended when installing an intercom system.

Q. When is it appropriate to use a single channel DVR?

A. A single channel digital recorder is designed as a VCR replacement and can plug into an existing multiplexer to provide all the features of a traditional analog VCR, including increased storage, faster search, and remote viewing capabilities.

Q. What is motion based recording?

A. This is recording based on the pixel change change in the camera's field of view. This function records video only where motion is detected which allows for storage of more events on the hard drive.

Q. What are some of the key concerns in determining what type of digital recorder is needed?

A. Key concerns include the number of locations to be monitored; the number of cameras; the nature of the surveillance problem, i.e. detection or deterence; videotape management; picture quality; and length of time data will be stored(archived). Equally important are how the video will be used and where the video will be used.

Q. What is wavelet compression and how does it differ from MPEG?

A. Wavelet records a whole image and is more efficient for time-lapse recording, MPEG archives high compression rate by storing only the changes from one frame to another, instead of each entire frame.

Q. Are images per second (ips) and frames per second (fps) different?

A. Images per second and frames per second are the same. They describe the video image that is stored.

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