Wireless video surveillance into the market mainstream

Good video transmission design is a very important part of video surveillance systems. As the most important transmission medium, wire and cable products play an indispensable role in the data, video and audio transmission and power connection of security systems. On October 29, 2013, the China Security Cable Alliance was officially established. In the future, we will continue to integrate the high-quality resources both inside and outside the industry, strengthen the extensive collaboration within and outside the industry, base ourselves on government management services, serve customers, and jointly promote the healthy development of China's security cable industry. Video surveillance transmission system will be effectively guaranteed, identity change.

What if the cable transmission system causes image distortion?

According to the "barrel rule," the final image quality will depend on the worst link in the entire system; the worst link is often the transmission system. The system designers and installers must select the appropriate transmission method, high-quality transmission cables and equipment according to actual needs, and install them according to professional standards in order to achieve the desired transmission effect.

Video signal transmission generally adopts direct modulation technology and takes the form of baseband frequency (about 8MHz bandwidth). The most commonly used transmission medium is coaxial cable. Coaxial cable is specially designed to transmit video signals. Its frequency loss, image distortion, and image attenuation are relatively small, which can well complete the task of transmitting video signals. Commonly used special SYV75 ohm series coaxial cable, commonly used model is SYV75-5 (its non-relay transmission distance for video signal is generally 300-500m); when the distance is longer, SYV75-7, SYV75-9 or even SYV75-12 coaxial cable (In practical projects, the thick cable has an unrelayed transmission distance of up to 1km or more); there are also video amplifiers to increase the brightness, chrominance, and synchronization of the video, but the interference signal in the line is also It will be amplified, so too many video amplifiers cannot be connected in series in the loop. Otherwise, saturation will appear, resulting in image distortion.

Identity change, video surveillance transmission system has entered the wireless era. After 3-5 years of development, the weight of the balance began to be applied to wireless networks. The wireless network has achieved rapid development in video surveillance applications. The practical application of wireless from the market Look to have begun to dominate the video surveillance market. As the earliest professional manufacturer of wireless video surveillance applications in China, BITWAVE has a profound influence on this trend. The rapid evolution of wireless technology is the fundamental driving force for the development of the wireless surveillance market. It is based on leading wireless technologies and combines wireless network planning with many industries. With the implementation experience of the project and the comprehensive advantages of R&D, service and brand, more and more customers are aware of the importance of wireless video transmission, and they have begun to rely on BITWAVE, which focuses on wireless transmission, carrier network coverage, and video surveillance. The application of important brands, especially involving safe city monitoring, forest fire monitoring, tunnel monitoring, park area monitoring, port monitoring and other fields, wireless applications have made a lot of exemplary and representative monitoring applications.

In the video surveillance application project, the favor of wireless networks is naturally justified. First, the wireless network has developed over the past decade. The technology is very mature and the price is very low. The once noble aristocratic products have become popular, at BITWAVE. The wireless product line has completely transitioned to the 802.11N standard, and the bandwidth of point-to-point wireless bridges has been increased several times. It can easily meet the high bandwidth requirements of mainstream HD video, but the prices are gradually falling back. "Fly into the "people's home"; followed by video surveillance has been widely applied in various industries, and in the rapid development of more extensive applications; then there is a large-scale monitoring system more and more architecture in the network Based on the above, the rapid development of all network monitoring technologies and markets has further promoted the construction of basic networks.

As a part of the network, the wireless network has the obvious advantage that the wired network cannot be replaced. It is convenient and flexible to build a network, has a low cost, protects users' investment, and is reliable in use.

It is based on the above three reasons, the low cost of wireless technology to monitor the market demand, strong network monitoring has become mainstream, which gave birth to a huge wireless surveillance market. With strong demand and technical support, more and more network companies are involved in wireless video surveillance applications, which has spawned numerous companies to promote the application of wireless in video surveillance, such as Alvarion, MOTO, BITWAVE and other famous brands. In addition, there are numerous manufacturers of wireless products, and they are also actively making their own efforts for the wireless monitoring market. It is with such a large number of manufacturers pulling the wireless video market that wireless video surveillance is now being used as a supplemental identity for wired networks, and has officially completed the change of identity of mainstream surveillance applications.

The optical fiber transmission market is promising With the increasing demand for various image status and data monitoring, the transmission distance of the image signal can no longer meet the demand. Therefore, the development of optical fiber integrated image and control signals (WDM or DWDM technology) can be transmitted for longer. distance.

In addition to the combination of video and control requirements, the optical fiber monitoring and transmission architecture is the main axis of the entire optical fiber transmission and construction. With the different deployment methods, there will be different uses and functions.

The application scope of optical fiber communication is quite extensive. It can be broadly divided into five categories: telecommunication network, datacom network, monitoring network (CCTV) and cable television (CATV) optical fiber transmission network and fiber user loop (FiberInTheLoop, FITL). , And defense and military can also be seen in the application of fiber optic communications.

In the field of monitoring networks (CCTV), it is mostly used as the backbone of the monitoring architecture. It may convert pure video and control signals to optical signals (FOT/FOR), and it may also use digital video signals via TCP/IP networks. Convert to optical TCP/IP signals for transmission and restoration.

With the development of optical fiber communication technology, there are more and more image transmission methods. The optical signal transmission of the optical transceiver has greater advantages than other transmissions such as twisted pair transmission and coaxial cable transmission. It is well-known that optical fiber transmission mainly relies on the optical transceiver to convert an electrical signal to an optical signal at one end of the optical fiber (cable) and to switch the optical signal back to the corresponding electrical signal at the other end. The optical transceiver provides a flexible transmission and networking method for the monitoring system, with good signal quality and high stability.

In recent years, due to the rapid development of optical fiber communication technology, the cost of optical fiber transmission monitoring systems has also been greatly reduced, so the application of optical fibers and optical transceivers in monitoring systems is becoming more and more popular. Optical fibers have been widely used in home optical fibers and office access networks in areas such as home intelligence, office automation, industrial control networks, automotive airborne and military communications networks. For high-definition video streams that require high transmission bandwidth and transmission distance, it is no longer a dream to realize high-definition monitoring in the era of optical fiber.

With the development of the information society, people are increasingly demanding security monitoring. Except for centralized party and government agencies and enterprises and institutions, such as in the complex environments of sea, mountains, mines, and basements, it is impossible to establish a wired network. local. All need to achieve security video surveillance, which requires the use of wireless video transmission technology. Coupled with the establishment of the cable transmission alliance, the dual guarantees make security video surveillance applications unlimited.