The security industry also has to pass several difficulties in the application of networking

With the increasing demand for monitoring and networking, the networking of the security industry has gradually changed from a conceptual demand to a real hard demand. After many years of exploration and efforts, many Chinese security manufacturers have begun to embark on the competition stage of a new generation of security products.

Undoubtedly, networked products have been put on the agenda, and even some manufacturers have changed and adjusted their industrial structure and accelerated the development of networks. The traditional monitoring industry will be replaced by networked products.

However, the actual situation is not as optimistic as people expect. Mainly in the following areas:

The current network bandwidth is not enough The current network bandwidth in China is not wide enough, either for commercial use or civilian use. Although the development of the Chinese network is at the forefront of the world, its development speed is unmatched by any country. But why is it that it is not enough to use networked monitoring products? The reason is simple: The cost of broadband, whether leased or dedicated, has remained high. In theory, a 500Kb bandwidth transmission image is enough, but the actual situation is telecommunications operators nominal 1M network, the flow is only 100Kb, if you want to pass a signal to clear the image at least 5M this bandwidth. And its high cost made many people daunting. However, if it is the long-distance transmission of cross-regional industries, leased lines or self-laying of optical fiber, the cost is even more unbearable.

Currently, the most widely used is the lease of dynamic IP and static network fiber. Although the cost is low, the transmission effect has always been the bottleneck of network development.

IPv4 addresses are becoming less and less The second-generation Internet IPv4 technology we currently use, the core technology belongs to the United States. Its biggest problem is that network address resources are limited. In theory, 16 million networks and 4 billion hosts are addressed. However, after using the three addressing modes A, B, and C, the number of available network addresses and host addresses is greatly reduced, so that the current IP address is almost depleted. Among them, North America occupies 3/4, about 3 billion, and the most populous in Asia is less than 400 million. China has only 30 million. The lack of addresses severely restricts the application and development of the Internet in China and other countries.

On the one hand, the number of address resources is limited, and on the other hand, with the development of electronic technologies and network technologies, computer networks will enter people's daily lives, and everything around them may need to be connected to the global Internet. In this environment, IPv6 came into being. In terms of numbers, IPv6 has an address capacity of about 8×10^28 times that of IPv4, which is 2^128-1. This not only solves the problem of the number of network address resources, but also clears the obstacles for the number of devices connected to the Internet other than computers.

Like IPv4, IPv6 causes a lot of wasted IP addresses. To be precise, there are no 2^128-1 fully utilized addresses for networks using IPv6. First of all, to achieve automatic configuration of IP addresses, the subnet prefix used by the LAN must be equal to 64, but very few LANs can accommodate 2^64 network terminals; secondly, since IPv6 address allocation must follow the principle of clustering, The waste of addresses is inevitable.

Network-based security products are designed to get rid of the shackles of IPv4 addresses and are compatible with IPv6. So that each IP camera will not be widely used because of IP address restrictions.

Large-scale platform software is not yet mature and unstable. Security products purchased by the current school education agencies, public security inspection agencies, and the group's industry, whether it is analog products or a new generation of IP-based products, can achieve multi-level networking through cross-region networking. This is a very hard demand. .

Over the years, apart from leasing or paving special networks, there is almost no networking that guarantees smooth transmission and can save costs effectively.

However, many existing security platforms can be effectively applied to the actual network through dynamic networks or static network networks, and the performance is very unstable. On the whole, no matter what kind of technical platform software exists, there are problems that affect performance more or less. At present, many manufacturers are also developing the platform software that can be truly stable for the environment based on the current environment. This will be the key to solving the problem of network product merchants expanding their markets in the future and successfully transforming them.

There are several compression formats that do not have a unified industry-standard network camera, and the mainstream image compression format in the market is H. 264, MPEG-4, M-JPEG, JPEG, MPEG-2 and so on, each compression method has its own characteristics, the different compression format directly determines the image quality and bandwidth occupancy, the current mainstream compression format is H. 264.

Standard H. 264 is the standard of production for many current IP camera manufacturers. The network of cameras is due to its flexibility of installation and low cost of operation. It eliminates the need for users to pay for the installation of hard disk recorders and coaxial cables, and also eliminates the instability caused by PC digital hard disk recorders. As long as there is a network available, it can access work at any node on the network. And can use personal computers to access and record through the LAN or wide area network, which greatly facilitates the user access to front-end video information. However, many manufacturers use standard H while developing network products. 264 codec public opinion, but for the manufacturer's pursuit of product personalization and specialization, from which more or less add the exclusive part, so that the nominal H. 264 public - is not standard. Even if the front-end products are not connected to the same manufacturer's platform, they can be decoded and managed centrally in the monitoring terminal. This also violates the original intention that the IP product of security products can bring great convenience to people's production and life.

H. 264 makes the image compression technology rise to a higher stage and can provide high-quality image transmission at a lower bandwidth, which is very suitable for the situation in which domestic operators have a large amount of users and the access network/backbone network bandwidth is relatively limited. In the same cage-quality, H. The 264 saves an average of 64% of the transport stream compared to the previous-generation encoding standard MPEG-2, and an average of 39% more than the MPEG-4 ASP transport stream. Many global IPTV service providers will be H. 264 as the codec format standards, including Belgium Telecom, Netherlands KPN, Thailand ADC Telecom, China Telecom and so on. For integrators and end-users, we need to pay attention, although many vendors on the market today claim that their network cameras are H. 264 compression format, but not necessarily the standard H. 264. Standard H. 264 Image Compression Format Images can be played through standard streaming media playback software, allowing access to multi-brand surveillance systems.