| Telemetry |
A system utilising ‘control code’ transmitters and receivers. These use the video cable or a simple twisted pair cable to send their information. |
Terminated (75 Ohm
terminated) |
Video input of a piece of CCTV equipment, wired to be the last in a particular video line. |
| TFT |
Thin Film Translator. A type of flat screen display. |
| Time Zone |
A period of time during which access is authorised. It can be defined by the time of day and days of the week. |
| Time-Lapse VCR |
Video recorder that can record frames with pauses between them thereby extending the time that a standard length tape will last. |
Timebase Corrector
(T.B.C.) |
Electronic circuit that aligns unsynchronised video signals before signal processing. Used in multiplexers and quad splitters. |
| Token Ring |
A network-access mechanism and ring topology in which a supervisory frame or token is passed from station to station as a poll for network transmission (IEEE 802.5 standard). |
| Triplex™ |
Multiplexer feature that gives you the ability to simultaneously view both playback and live cameras within the same multi-screen, while still encoding. |
TVL (Television
Lines - Resolution) |
The maximum number of changes between light and dark on a picture across 3/4 of the width dictates the resolution of a CCTV product, measured in TVL. |
| Twisted Pair |
A cable, often screened, that consists of two conductors twisted together along their length. UNIX‚ An operating system originally designed by AT&T for multi-users applications. Other versions include AIX, XENIX and LINUX. |
