As the domestic security cable industry continues to evolve and establish a more regulated and stable market environment, companies are increasingly focusing on enhancing their internal capabilities and expanding their product and service offerings. This progress is akin to a spring breeze sweeping through China's security sector, paving the way for rapid and sustainable growth. Together, we can build a stronger, safer future for this promising industry.
**Video Monitoring Cable Selection**
Video signal transmission typically employs direct modulation technology, operating at baseband frequencies (approximately 8MHz bandwidth). Among various transmission media, coaxial cables are the most commonly used due to their optimized design for video signals. They exhibit minimal frequency loss, image distortion, and signal attenuation, making them ideal for transmitting high-quality video. The most widely used type is the SYV75 ohm series coaxial cable, with models like SYV75-5 being suitable for non-relay transmission distances of 300–500 meters. For longer distances, thicker cables such as SYV75-7, SYV75-9, or even SYV75-12 are preferred, capable of transmitting signals over 1 km without relays. However, using too many video amplifiers can lead to signal saturation and image distortion. In such cases, fiber optic cables are often employed due to their low signal loss, wide bandwidth, immunity to electromagnetic interference, and excellent data confidentiality. These advantages make fiber optics the preferred choice for long-distance video, audio, and control signal transmission in CCTV systems.
In addition to coaxial cables, twisted pair cables can also be used for video transmission, especially when existing wiring infrastructure is already in place. This method requires specialized twisted pair transmission equipment that converts unbalanced video signals (suitable for 75Ω coaxial cables) into balanced signals compatible with twisted pairs. At the receiving end, the signal is converted back to its original form. These devices also offer built-in signal amplification, making them suitable for long-distance applications. The choice of transmission method depends on factors such as distance, signal quality requirements, and infrastructure availability.
Communication cables are commonly used in systems equipped with electric pan/tilt heads and motorized lenses. These cables connect on-site decoders to control centers and typically use 2-core shielded cables (RVVP) or category 3 twisted pair (UTP), with each core having a cross-sectional area between 0.3mm² and 0.5mm². The general rule is that the longer the distance, the larger the wire diameter. For example, while RS-485 communication is rated for 1200 meters, using RVV2-1.5 sheathed wire can extend the range beyond 2000 meters. When the distance exceeds this, an RS-485 repeater may be necessary.
Control cables are used to manage pan/tilt and motorized lens functions. These cables usually have multiple cores, such as 6-core or 10-core types like RVV6-0.2 or RVV10-0.12. The 6-core cable controls basic movement, while the 10-core includes additional functions for zoom, focus, and aperture. Due to short distances, shielding is typically not required unless the system is in a high-interference environment.
Audio monitoring cables often use 4-core shielded cables (RVVP) or category 3 twisted pair (UTP), with each core having a cross-sectional area of 0.5mm². In low-interference settings, unshielded twisted pair cables like Category 5 can also be used. For point-to-point audio transmission, non-shielded 2-core cables such as RVV2-0.5 are commonly used.
**Video Monitoring Cable FAQ**
According to the "barrel rule," the final image quality depends on the weakest link in the system, which is often the transmission line. System designers and installers must choose appropriate transmission methods, high-quality cables, and professional installation techniques to ensure optimal performance.
**Q: Is there a directionality in the crimp tailpipe?**
A: For stepless (straight) tailpipes like BCP-C3B, the direction during installation does not matter. However, for BCP-C5FA or similar connectors, the tailpipe should be installed in the direction indicated, with the cable inserted from the smaller end.
**Q: How do I handle aluminum foil for coaxial cables with aluminum foil shielding?**
A: If the aluminum foil is not sticky, it should be completely stripped. If it adheres to the insulator, clean the conductor and any debris to prevent short circuits.
**Q: Why do some other company’s connectors have a pointed central pin? Do they match Canon’s BNC sockets?**
A: Connectors with pointed pins follow the 50 JIS standard, while Canon’s BNC sockets meet military standards. Although the design differs, they are compatible and do not affect contact quality.
**Q: Can I use the same connector for cables not listed in the connector matching table, as long as they are close in size?**
A: No. Even if the connection seems possible, the quality may be compromised. Unlisted cables should be tested before use, especially with crimp-type connectors.
**Q: What is the cable connection strength?**
A: It refers to the maximum tensile force the cable can withstand when pulled out of the connector. For Canare products, this refers to the outer conductor strength, excluding the center contact.
**Q: What is the connector insertion loss value?**
A: Insertion loss varies by connector, but for standard plugs, it is typically around 0.1dB (DC-2GHz) per connector.
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