What Kind Of Cable To Choose For The Video Doorbell System
At present, most of the connecting cables used in commercial building intercom systems are signal control lines (such as PVC sheathed flexible wire RVV and shielded wire RVVP), coaxial line SYV-75 series cables, and the system's requirement for cables is to transmit voice and data. , Video and other signals. At the same time, the requirements of the cable are expressed in the quality of voice transmission, the speed of data transmission, and the quality and speed of video signal transmission. In the visual dialogue system of the building, the quality requirements of the connecting cable are quite high. The cables that transmit voice signals and alarm signals are mainly PVC sheathed soft with 4 cores or more. Video transmission is mainly based on the coaxial cable SYV-75-5, and now there are new signal transmission technologies including video, which do not use coaxial cable. If the system cannot prevent external interference or grounding, the connecting wire used in the system must be a shielded wire (RVVP).
The line standard of the direct button building video intercom system: the video, two-way audio, remote unlocking and other wiring terminals of each indoor unit are connected to the entrance machine by bus, but each call line is directly connected to the entrance machine. Therefore, there are many cables used in the multi-family visual dialogue system of this structure: video coaxial cable SYV-75-3 or SYV-75-5, speaker/speaker/unlocking cable is a 4-core unshielded PVC sheathed cord ( RVVV) or shielded wire (RVVP), the power connection wire generally uses a two-core PVC sheathed flexible wire, and the call line uses a 2-core shielded wire.
Digital code button type visual intercom system is generally applied to residents with many high-rise residential buildings. According to the manufacturer's equipment system, the configuration standard of the connecting cable is also different, but generally speaking, the main trunk line includes video coaxial line (SYV-75-3, SYV-75-5, etc.), power line, audio/data control line , Household signal lines, etc.
Many residential buildings with building visual intercom systems are equipped with management center machines, and residential area wall machines are installed at the wall entrances of residential areas, so that residents, management centers and visitors can realize the so-called three-way communication of technical defense. This kind of network system wiring adds the unit entrance machine. The network cable between the residential area entrance machine and the management center machine usually includes video coaxial lines (SYV-75-3, SYV-75-5, SYV-75-7, etc.) ) Transmission of video image signals, 4-core shielded wire (RVVP) transmission of audio and control signals, etc.
