Feasibility of large-scale HD-SDI networking
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There are also many debates about the application of HD-SDI in the security industry. Here are three questions about the application of HD-SDI.
Feasibility of large-scale HD-SDI networking
1. Capital investment: In the entire input process, the use of old equipment should be considered (as shown in Figure 2).
For a system with a relatively small area, the old equipment can actually utilize the optical fiber, and most of the display equipment, while the coaxial line depends on the specific conditions such as the degree of loss and the distance. The utilization of the distributed system coaxial line is lower. Therefore, the reduced cost in terms of profitability is a small part compared to the total cost of the HD-SDI system.
2. Continuity of the original system: It is difficult for the user to completely negate the original system. In most cases, the system is gradually upgraded, and the effect of the old investment is exerted as much as possible under feasible conditions.
Then, when building a new system, you must consider the compatibility and integration of the old system. Therefore, the general situation is to use new technology and new products to enhance the new energy while being compatible with the old system.
In fact, as a manufacturer, it will also consider the continuity of the original system and the original technology. As a manufacturer, after experiencing product development, promotion, and sales, it will certainly consider the continuity of its original system sales profit after reaching the scale sales.
3. The actual effect can be achieved: The new HD-SDI system is a big investment for the user, so what effect can it reach after the investment? Is it helpful for the business?
Applied industry and implementation
Therefore, while providing high-definition video sources, the corresponding intelligent functions require manufacturers to develop and customize functions for customers, such as face recognition, license plate capture, feature screening, behavior recognition, traffic statistics, automatic tracking, and so on. The application of practical application functions will further accelerate the application of HD-SDI. At present, most of the applications of such customized functions are still on the promotion level. The actual application still needs hardware chip functions, unified interfaces, and functional development support of software vendors.
4. Security considerations: Some special industry network security requirements are strict, such as the public security internal system has the requirement that IP can not be exposed, which creates great obstacles for the video surveillance system to be integrated into the public security network. The closure of the HD-SDI system gives a new option to the security industry.
5. Convenient operation and maintenance: The ease of operation and maintenance is also one of the customer's considerations. Both IP systems and HD-SDI systems have advantages. IP systems have significant advantages in terms of control flexibility and scalability. The HD-SDI system has obvious advantages in real-time control, but real-time control has obvious advantages only in local control.
According to the above five points of customer concern, the conclusion is that the large-scale HD-SDI networking is very unlikely.
Applied industry and implementation
1. Application place:
According to the characteristics of the HD-SDI system, its application group is summarized as: the place for on-site monitoring and fast control than playback. For example, safe city, bank, hospital, school, casino, airport, prison, highway, intelligent building and other fields can be applied to HD-SDI monitoring system. Therefore, you can choose HD-SDI cameras for key areas.
2. Application Principles: Rational use can maximize performance and cost.
3. Application plan:
HD-SDI Hybrid Application Simulation/HD-SDI System Hybrid:
· Focus area HD-SDI acquisition, real-time display;
· HD DVR video in key areas;
· Traditional analog systems in other regions;
· Unified conversion to SDI and unified access to the HD matrix on the wall display;
· Use coaxial transmission for short distances;
• Use fiber optic transmission over long distances.
HD-SDI hybrid application IP/HD-SDI system hybrid:
· Based on HD-SDI signal acquisition, transmission, distribution, real-time display, based on IP call, storage, analysis;
· Focus area HD-SDI acquisition, local real-time display;
· Focus area HD DVR recording / or encoding back-end storage;
· Other regional IP surveillance systems;
· The back-end platform is concentrated on the wall display;
· Use coaxial transmission for short distances;
· Long-distance use of fiber-optic transmission, single-core fiber can be used to transmit 8-channel HD-SDI HD video.
Can HD-SDI replace IP?
4. Some suggestions for current industry applications: focus on monitoring centers, fewer levels, and shorter distances (such as banks, schools, casinos, etc.).
· In the short-term, after the replacement of key areas or new construction, the number of uses can be increased after the cost of matching is reduced;
· Local real-time monitoring and control (HD-SDI);
· Code storage;
· If you need remote: IP mode;
· For distributed systems, distances (such as safe cities, roads, etc.);
· In the short-term, the key areas will be replaced or the new ones will be increased after the supporting costs are reduced, and the transmission costs will decrease.
· Local real-time monitoring and control (HD-SDI);
· If the police station needs more high-definition monitoring, it can use local multi-point HD-SDI high-definition display control, and take all the way to upload to the branch office with fiber. To reduce the pressure on the backbone fiber and reduce the transmission cost;
· Code storage;
· Superior monitoring: IP mode.
Can HD-SDI replace IP?
1. Standards: The broadcasting and television standards are applicable to the broadcasting and television industry: the characteristics of the broadcasting and television industry are transmitted by the customer after the signal is sent but need not be stored; in addition, the limited number of signal sources is mainly the television station.
Monitoring industry application features: video signals are displayed in real time and must be stored; in addition, the number of signal sources is unlimited and the position distribution is dispersed. An HD-SDI camera is equivalent to a bottle to a TV show.
The TV industry is developing rapidly due to mature standards. However, the monitoring industry that uses this standard in HD is difficult to achieve the rapid development and popularity of the TV industry due to different industry characteristics.
2. Storage: The storage of uncompressed storage is basically impossible. The code stream of 1.485G is 200 times that of our current IP HD 4~8M. The storage cost cannot be tolerated, so encoding compression storage becomes inevitable, and after encoding compression, Subsequent systems are no different from IP.
In addition, monitoring industry storage data is generally more important than on-site browsing. IP HD storage has gradually matured and can meet user needs.
3. In terms of clarity: At present, HD-SDI is 2 million. Will there be any changes in the interface and transmission line if the resolution is to be improved in the future? If there is any change, there will be a new round of compatibility.
4. Extensions
The connection extension is always inferior to IP.
Therefore, from the above point of view, we can conclude that IP / HD-SDI is not a mutual competition, but more complementary.
Conclusion
HD-SDI and IP surveillance will complement each other. The IP extension is convenient, the application is flexible (multi-stream), the control is diversified, and the storage is convenient and flexible. HD-SDI is exciting and anticipating due to its high quality and no delay. Of course, HD-CCTV has not experienced much time since its introduction, no matter from the introduction of camp members, marketing, and technical difficulties, it is still in its infancy. However, as the technical difficulties are overcome, more and more companies, manufacturers join, the cost of hardware and solutions will become lower and lower, and will be more and more attention in the security industry.
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