Key technical solutions of the Standard Working Group
The "Digital TV Receiving Equipment and Home Network System Platform Interface Standard" developed by the China Home Network Standards Working Group is the first Chinese home network industry standard. This standard is a series that includes: "Home Network System Architecture and Reference Model "," Home Main Network Communication Protocol Specification "," Home Main Network Interface Conformance Testing Specification "," Home Control Subnet Communication Protocol Specification "," Home Control Subnet Communication Protocol Conformance Testing Specification "and" Home Network Equipment Six items in the "Description File Specification".
The "Home Network System Architecture and Reference Model" standard divides the home network into a home main network and a home control subnet. The home main network is used to transmit high-speed information including audio and video information, and the bandwidth requirements are relatively wide, and the cost of the communication module is also relatively high; the home control subnet is used to transmit low-speed information including control information, and the bandwidth requirements are compared Narrow, the cost of the communication module is relatively low. The architecture has been unanimously approved by industry experts.
The "Home Main Network Communication Protocol Specification" defines wired and wireless physical transmission media and uses different communication protocols. The home main network uses the internationally accepted TCP / IP communication protocol, and the underlying physical communication uses standards such as Ethernet and 802.11.
The "Conformance Test Specification for Home Main Network Interface" specifies the test method for the consistency of the main network interface and communication protocol in the home network system, which is specifically used to test the interconnection of the main network equipment used and the production and inspection of the main network equipment. Conduct specifications.
The "Home Control Subnet Communication Protocol Specification" identifies wired and wireless physical transmission media, adopts communication protocols with independent intellectual property rights, and clarifies the scalability of the protocol to support other physical transmission media including power line carriers.
"Home Control Subnet Communication Protocol Conformance Test Specification" stipulates the test method and inspection standard of the home control subnet interface conformance, which is applicable to equipment, mobile control terminals and home control subnets that comply with the "Home Control Subnet Communication Protocol Specification" Network gateway test.
In order to ensure the universality of mobile control terminals and control subnet gateways, and to enable the system to add new devices, the "Home Network Device Description File Specification" uses a device description file (DeviceFile) data structure to describe home control subnet devices .
At present, in the application of home network systems, wireless physical transmission medium systems are generally optimistic. In the related technology research and development process, the first thing to face is the frequency of wireless transmission. For this reason, the Standards Working Group specially applied to the National Radio Administration, after many communications and exchanges with experts of the National Radio Administration, The radio frequency for the wireless home control subnet has been determined.
Comparison with similar international standards
At present, there are many international communication protocols and standards around home network technology, but due to the influence of their respective interests, no unified protocol or standard has been formed yet.
Compared with the internationally popular home network protocol specifications and standards, the "Standard Working Group based on R & D results and industrialization-oriented" Digital TV Receiving Equipment and Home Network System Platform Interface Standards "has the following significant features:
1. The physical transmission medium of the home network system has both wired and wireless modes, and the products can meet the needs of consumers at different levels.
2. In order to facilitate the development of industrialization, the Standards Working Group innovatively proposed a method of device description files, which can facilitate the interconnection, intercommunication and interoperation of products produced by different manufacturers.
3. The home network platform involved in the standard is based on the independently developed home information network platform, so the prices of various products developed according to the standard will be significantly lower than those of foreign products of the same grade. The popularization and promotion of the network system laid a good foundation.
4. Since the home network is not an isolated system, but is connected to the Internet, telephone network, and cable TV network, the working group fully considered the compatibility of the home network and other network system interfaces and communication protocols during the formulation of the standard .
In short, "Digital TV receiving equipment and home network system platform interface standard" is based on meeting the needs, by selecting the best technical solution, based on independent technology to be compatible with international common standards.
The difference between "Digital TV receiving equipment and home network system platform interface standard" and the international standard is that the former not only makes up for the shortcomings of the international standard in address mapping in remote access to the home network, but also forms a performance and cost aspect. It is suitable for the home control subnet communication protocol of the Chinese market.
Viewed as a whole, the "Digital TV Receiving Equipment and Home Network System Platform Interface Standard" is equivalent in performance and function to similar international standards, but it is higher in flexibility and safety than similar international standards. At present, the "Haier ejia" developed by ejiajia according to this standard has been industrialized.
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