Cascadia Digital video recorder Instrukcja Użytkownika Pobierz pdf (Strona 37)

CCTV Glossary

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UHF signal. - Ultra high frequency signal. In television it is defined to belong in the radio spectrum

between 470 MHz and 850 MHz.

Unbalanced signal. - In CCTV, this refers to a type of video signal transmission through a coaxial

cable. It is called unbalanced because the signal travels through the center core only, while the

cable shield is used for equating the two voltage potentials between the coaxial cable ends.

Underscan. - Decreases raster size H and V so that all four edges of the picture are visible on the

monitor.

UPS. - Uninterruptible power supply. These are power supplies used in the majority of high security

systems, whose purpose is to back-up the system for at least 10 minutes without mains power. The

duration of this depends on the size of the UPS, usually expressed in VA, and the current

consumption of the system itself.

UTP. - Unshielded twisted pair. A cable medium with one or more pairs of twisted insulated copper

conductors bound in a single sheath. Now the most common method of bringing telephone and

data to the desktop.

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Cascadia Digital video recorder Instrukcja Użytkownika Strona 37