Weak current College】 【buy international standard video equipment advantages and judgment --- Power By】 【China power house network.

Video conferencing technology after years of development, have entered a relatively mature stage of development, the International Telecommunication Union (ITU) H.320, H.323 protocol family have separately series serve as circuit-switched network and IP network video conferencing technology recognized mainstream technology standards. Domestic and foreign each video conferencing equipment manufacturers of technical standards, product features, is gradually mature on the basis of constant innovation. With video conferencing product features, performance enhancement and gradual reduction of the cost of the system, but also for enterprise applications and paved the way for the Conference. Choose the international standard video equipment and professional telecom carriers, enterprises building video conference system is often a lack of professional staff, on video conferencing technology do not know much, do not understand the importance of technical standards, thereby building video conference system technical programming, equipment selection, link, often ignore selected devices with the corresponding international standard, which is currently in the construction of enterprise video conferencing system which common errors. With regard to the ITU H.323 and H.320 series standard itself, in the relevant technical magazine you can find a lot of introduction, here no longer go into the details, the following focus on why you should choose the mainstream international standard product construction video conferencing network. 1. choose conforms to ITU H.320/H.323 series products, is the key to ensuring compatibility. Since the ITU in the initial development of this series of standards, is as telecommunications technologies to consider, therefore, in accordance with carrier-grade standards to define the product's compatibility, is this a series of standard basic principles. In the H.320/H.323 series of agreements which defines device capability negotiation process, at the same time provides for any equipment must meet minimum capacity, thereby ensuring the different vendors. Some users might think, self-constructed video conference system just internal use, compatibility may not seem so important, not necessarily. On the one hand, the enterprises construction video conferencing system is not normally in one step, but according to the actual need for investment in batches, if the user does not inadvertently chose at the beginning of the compatibility of the product, in the ensuing expansion will face painful choices: either accept been a monopolistic facts, price, duration, lost the initiative on the issue; or to the drawing board, reselect compatibility good mainstream products network; or adopt the compromise, expanding use of mainstream device, and then simulate docking approach, at the expense of functionality, sacrifice performance for audio and video, make do with reluctant; on the other hand, as the video communication applications broader future videoconferences application will be more than just confined to the internal, for example, with partners, and key customers, and Government departments held a video conference, and so on, this is already a foreseeable prospect, which of course will involve compatibility issues, which need to be equipped with international standard-based mainstream products to guarantee. 2. choose conforms to ITU H.320/H.323 series products, it is necessary to ensure a scalable, upgradeable key. ITU H.323 in formulating H.320/series of agreements, take full account of the video conferencing technology later development, when formulating technology frameworks to give full consideration to the left for technology upgrades, and according to the technical development has introduced a new version, the related fields of latest achievements into the system. This philosophy is reflected in the reality of the product, mainly has two aspects: one is the product itself with scalable features, old products by upgrading, you can put some new features added, for example, you can upgrade support MPEG4 video, supports dual vision transmission, etc.; on the other hand is a video conferencing system to support scalability, you can have the system based on the ease of adding new features, or change existing functionality. For example, the need for additional data conferencing capabilities, so you can increase the appropriate device, you need the whole network upgrade to MPEG4 high definition, you only need to have a device to retrofit, and acquiring some new equipment, you need the NET feature additional gatekeepers, and IP telephony interworking, acquiring gateway device, there are future Interworking with 3 g, and so on are all in the framework. But those who are not in accordance with the ITU standard to design products in design thinking is not possible to reach this level, there are no global for extensions, or even the same manufacturers in different stages of product interoperability on both the problem, if the user uses this type of networking products, want to increase the functionality and expand applications is very difficult. 3. choose conforms to ITU H.320/H.323 series products, it is necessary to ensure the quality of the video system is the important basis. The H.320/ITU H.323 series of agreements to become internationally recognized mainstream standards was not accidental, it is theoretically absorbed a large number of international top experts of essence, the practice is constantly improving, is the current international advanced video conference technology of synthesizer. In the standard, on the participation of the various entities of the Conference, is logically a well defined; the network traffic of all levels, with a clear division; for various network complexity, security, quality of service, and so on have a careful consideration; the establishment of the communication, Conference organization, has a clear definition. As technical standards, is a high starting point, in accordance with the standard design of the product can also be given a higher starting point, this despite the difficulty of implementation is relatively large, but in general the final product in the application of, the adaptability of the networks are more reliable. For those who do not follow the H.320/H.323 standard products, usually their own freely developed some simple mechanism to achieve, the advantage is the low technical difficulty, development progress, but a custom mechanism cannot, as the international standard that thoughtful, tend to be some designers do not take into account, such as products in the laboratory, in the practical application of environment problems; small-scale applications better, large-scale application in respect of defects; network conditions simple cases, a good, slightly more complicated network environments would appear strange problemEtc., but also because of the design concept of the defect, to modify seems very difficult, not to hurt the rib bone movement. How can I tell if a product is in compliance with international standards as the video conferencing products for conformance to standards so important, how to tell if a product is in compliance with international standards? it is not a problem, but unfortunately, due to some non-standard products manufacturers intentionally confusing concepts, misleading user, "with the Ethernet interface is H.323, H.320 dedicated interface is" the specious argument that lead some users also have doubts on this issue. This type of behavior is consistent with the business ethics to defer to the evaluation, but technically wrong but cannot help to elucidate. In fact, non-standard products often use E1, V.35, IP and other transport modes, but did not follow the H.320/ITU H.323 standards and therefore cannot call standard videoconferencing products, nor have the standard product advantages. To verify that a product meets the standards H.323, H.320 or most authoritative way is to use signaling Analyzer for analysis, but this kind of work at present only a minority of operators of laboratories can do, not reality. An alternative approach is to: and recognized standards-compliant products (such as Polycom, Radvision) interoperability in order to verify that the product supports the H.320/H.323 standard. In fact, at present the comparison of well-known in the industry's leading domestic manufacturers, such as Huawei, ZTE, zhongtai multimedia products are produced following the protocol standards. The need for formation of videoconferencing products for enterprises and institutions, as long as the choice of products, the manufacturers of the technical manual of instructions, measuring it with other mainstream manufacturers product compatibility, interoperability, it basically can avoid to select suitable products. Wu Hao dust