For at opnå lang-transmission af videosignaler på parsnoede-kabler skal der udføres forstærkning og kompensation. Det snoede-par videotransmissionsudstyr fuldender denne funktion. Efter tilføjelse af et par parsnoet videotransceiverudstyr kan billedet overføres til 1 til 2 km. Hvis relæmetoden anvendes, kan transmissionsafstanden fordobles, og kvaliteten af det transmitterede billede kan sammenlignes med den optiske transceivers. Prisen på parsnoet og parsnoet videotransmissionsudstyr er meget billigt, det øger ikke kun omkostningerne ved systemet, men dets omkostninger er meget lavere end for koaksialkabel, når afstanden øges. Derfor har brugen af parsnoet transmission i overvågningssystemet indlysende fordele:
1. Lang transmissionsafstand og høj transmissionskvalitet.
Due to the advanced processing technology used in the twisted pair transceiver, the attenuation of the video signal amplitude of the twisted pair pair and the attenuation difference between different frequencies are perfectly compensated, and the brightness and color of the original image and the real-time performance are maintained. When the transmission distance reaches 1km or more, the image signal is basically free of distortion. If the relay method is used, the transmission distance will be longer.
2. Ledningerne er praktiske, og kabeludnyttelsesgraden er høj.
A pair of ordinary telephone lines can be used to transmit video signals. In addition, any pair of Category 5 unshielded twisted-pair cables widely laid in buildings can transmit one video signal without additional wiring. Even re-wiring, Category 5 cables are easier than coaxial cables. In addition, there are 4 pairs of twisted pairs in a Category 5 cable. If one pair of wires is used to transmit video signals, the other pairs of wires can also be used to transmit audio signals, control signals, power supply or other signals, improving the cable performance. Utilization rate, while avoiding the trouble caused by the separate wiring of various signals, reducing the engineering cost.
3. Stærk anti-interferensevne.
The twisted pair can effectively suppress common mode interference, and even in a strong interference environment, the twisted pair can transmit excellent image signals. Moreover, several pairs of twisted pairs in one cable are used to transmit different signals respectively, and there will be no interference with each other.
4. Høj pålidelighed og nem at bruge.
Using twisted pair to transmit video signal, a dedicated transmitter should be connected to the front end, and a dedicated receiver should be connected to the control center. This twisted pair transmission equipment is cheap and easy to use. It does not require professional knowledge and does not require much operation. It can be installed once and can work stably for a long time.
The price is cheap and the materials are convenient.
Since the common Category 5 unshielded cables or common telephone lines that are widely used are used, it is easy to purchase and the price is very cheap, which brings great convenience to engineering applications.
