What would happen to the human world without a network? Today's network has become an indispensable resource for human survival and development like water and electricity. Cyberspace is also seen as the “fifth space†after land, sea, air and sky. China should seize the opportunity of global transition from IPv4 to IPv6, and take the next step in the innovation of network core technology. The GNTC conference can be said to be a major review of technological innovations in the network field in recent years. Hot topics such as network security, SDN, NFV, 5G, NB-IoT, edge computing, cloud computing, and IPv6 are all covered. GNTC is also a "prophecy" conference for the future development of the network. For the evolution and transformation of the next generation network, the participating scholars, experts and manufacturers, and industry users have their own opinions. The General Office of the Central Committee of the Communist Party of China and the General Office of the State Council issued the Action Plan for Promoting the Scale Deployment of the Internet Protocol Version 6 (IPv6) (hereinafter referred to as the “Action Planâ€), and issued a notice requesting all departments in various regions to conscientiously implement it in light of the actual situation. The main goal of the Action Plan is to form the next generation Internet independent technology system and industrial ecology in 5 to 10 years, and build the world's largest IPv6 business application network to realize the deep integration and application of the next generation Internet in various fields of economy and society. Become an important leading force in the development of the next generation of the Internet worldwide. The promulgation of the "Action Plan" will not only greatly promote the deployment of IPv6, but also play a huge role in the innovation of China's network core technology. The Asia-Pacific Internet Information Center predicts that IPv4 will withdraw from the historical arena within 10 years and the Internet will be fully transferred to IPv6. Dr. Wendun Josef, who is known as one of the fathers of the Internet, also said that IPv6 is the only way for the future development of the network. Currently widely used IPv4 protocol addresses have been allocated. In his speech at the GNTC conference, Academician He Hezhen of the Chinese Academy of Engineering mentioned that the United States has the most IPv4 addresses, and each Internet user can be divided into nearly six addresses, while Chinese netizens are less than half of the IPv4 addresses. With the rapid development of Internet applications such as the Internet of Things and "Internet +", the global demand for IP addresses will continue to increase. In order to solve the problem of insufficient IP address, in the 1990s, the Internet Engineering Task Force (IETF) launched the IPv6 protocol after seeking and coordinating opinions from all parties, and began to promote it on a global scale. Since IPv6 uses a 128-bit address and expands the address space to 2 to the 128th power, this space is unimaginable. This is undoubtedly a great benefit for the scalability of the first element of network development. Hehe said that technically, the IPv6 super-large address space solves the problem of network real-name system and user identity traceability, and can realize precise management of the network. With the growing demand for VoLTE and the Internet of Everything, and the comprehensive consideration of factors such as cost reduction, the development of global IPv6 will accelerate. Wu Jianping, an academician of the Chinese Academy of Engineering and a professor at Tsinghua University, mentioned a set of data at the GNTC conference: In 2015, global IPv6 traffic increased 10 times compared with 2012. It is expected that by 2018, IPv6 traffic will exceed IPv4. Undoubtedly, IPv6 will become the cornerstone and propeller for the development of the next generation Internet. However, at present, the development of IPv6 in China is still lagging behind the developed countries in the world, and it requires the joint efforts of the government and the industrial chain. In view of the shortage of IPv4 addresses, countries around the world have already promoted IPv6 as an important task. At the government level, the EU has designated an action plan to promote IPv6, and the government department network has converted IPv6 first. All devices that the US requires to purchase are compatible with IPv6. Japan requires all operators to launch IPv6 services in April 2011. At the commercial level, large international websites currently support IPv6: Google, Facebook, Youtu, Yahoo! , Bing, Wikipedia, etc., more than 10% of the AlexaTOP1000 rankings also support IPv6. In promoting IPv6, the United States is ahead of the world. Apple's application of applestore puts forward the requirement of mandatory IPv6 support. At the same time, Apple's mobile phone will adopt IPv6 to support the evolution of IPv6. CDNAkamai has fully supported IPv6 and has deployed IPv6 connectivity in 1500 service nodes in 95 countries. Compared with developed countries, the development of IPv6 in China is relatively lagging behind. The global ICP IPv6 support rate is 25.4%, and China is only 5.0%. Zhao Huiling, director of China Telecom Cloud Computing Research Center, said that application is the key to promoting the development of IPv6. However, China's IPv6 content sources are relatively scarce. Domestic mainstream applications barely support IPv6. IPv6 has not been opened since international portals, and international high-quality content sources cannot be introduced. On the other hand, terminal support needs to be vigorously promoted, and socialized fixed-line CPE basically does not support IPv6. These constraints lead to low penetration of IPv6 users in China, low IPv6 user activity, and low IPv6 traffic. In order to promote China's IPv6 work, the Chinese government has also introduced relevant development policies in recent years. In May 2015, the “Guiding Opinions of the General Office of the State Council on Accelerating the Construction of High-Speed ​​Broadband Networks to Promote Network Speed-Up and Reducing Fees†mentioned that it increased its support and promoted the evolution to the next generation Internet. The “Notice of the State Council on Printing and Distributing the Three-network Convergence Promotion Plan†announced on September 4, 2015, improved the network carrying capacity and technological innovation capability, and fully supported the sixth edition of the Internet Protocol (IPv6). However, in order to quickly promote IPv6, only the government's efforts are far from enough. Zhao Huiling said that IPv6 promotion should be unified by the government, strengthen the coordinated and balanced development of the industrial chain, mobilize the enthusiasm of telecom operators, content providers and terminal manufacturers, and vigorously promote the simultaneous development of IPv6 service applications and user terminals. Zhao Huiling put forward three specific suggestions: First, it is proposed to combine IPv6 website management and filing system to propose IPv6 support requirements for Internet applications in stages. Secondly, it is recommended to explicitly support IPv6 in the network access detection of terminal devices such as user gateways and mobile terminals. Third, it is recommended that Internet of Things applications, smart cities, etc. must be based on IPv6.
A through-bore slip ring is an electrical device that allows current to pass between two points in a rotating assembly without a physical connection. There is no break in the circuit. This is accomplished by passing the current through a rotating brush that contacts a stationary metal ring. The metal ring is mounted on the shaft of the assembly and provides a continuous path for the current.
It is an integrated circuit component that consists of two conducting rings that are separated by a gap or spacer. When the rings are brought into contact, current can flow between them and produce a rotational motion. Slip rings are used in various applications where high efficiency and low power consumption are essential, such as communication systems, motor control systems, and energy harvesting devices.
The through-bore design allows for rotation of the assembly while transmitting power or data. They are often used in applications where there is a need to rotate an object while keeping a power or data connection open, such as on a wind turbine or radar antenna.
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