The code needed to change your user code, and in some home security alarm systems, the master code is used to turn your system off and on.
"Panel"- This is the metal "box" that holds the circuit board or "brains" of the alarm system, along with the back up battery that powers your alarm during a blackout. In a normal installation, it is installed in the basement, usually somewhere near the circuit panel and telephone demarcation point (where the telephone line first enters your home). In an apartment or condo, it may be installed in a closet or above a drop ceiling. Be sure your panel is installed in an area where it cannot easily be tampered with.
A combination or array of electromechanical or electronic switches which route a number of signal sources to one or more designations.
The process, or results of the process, whereby some characteristic of one signal is varied in accordance with another signal. The modulated signal is called the carrier. The carrier may be modulated in three fundamental ways: by varying the amplitude, called amplitude modulation; by varying the frequency, called frequency modulation; by varying the phase, called phase modulation.
A unit of equipment that displays on the face of a picture tube the images detected and transmitted by a television camera.
Black and white with all shades of gray.
In monochrome television, a signal wave for controlling the brightness values in the picture. In color television, that part of the signal wave which has major control of the brightness values of the picture, whether displayed in color or in monochrome.
The transmission of a signal wave which represents the brightness values in the picture, but not the color (chrominance) values.