Telephone operators, cable operators and other providers are launching new broadband services, most of which include data, video and voice services that require higher bandwidth than in the past. Access network technology has made tremendous progress over the past few years, and people are no longer discussing how to provide the last mile of wireless broadband access technology, but how to deliver content to the appropriate room. At present, various home network technologies formed by different combinations of existing telephone lines, power lines, coaxial cables, structured wiring systems, and wireless technologies can be utilized to provide a variety of new services. The diversity of home networking technologies has increased the cost of suppliers and has caused consumers to be confused. As a result, service providers seem to be embarking on a convergence of networking technologies that support all types of cable connectivity and wireless technologies already in the home. The ideal platform to support existing and new home networking technologies is the Residential Gateway (RG) with powerful network capabilities.
This article refers to the address: http://
Various home network technologies
The development of the last mile access technology has increased the speed and robustness of data transmission, enabling operators to provide services with higher bandwidth requirements such as triple-service integration services. For example, Verizon's Fiber to the Home (FTTH) service enables extremely high broadband access. AT&T uses VDSL2 combined with Light to Roadside Technology (FTTC) to provide high data rate services to home users, which is also a reliable access method.
Service providers also view the home network as an integral part of the service because users want to deliver IPTV and other media content throughout the home. We currently use many types of home networking technologies.
Wireless connectivity is the most common home networking technology. Currently, this technology is mainly used for data distribution. Wireless technology has the advantage of mobility, which is the main reason for its promotion. However, wireless technology is also difficult to reliably transmit video content. Due to the long distances of wireless connections and the blocking of RF signals on concrete walls, the data rates required for HDTV may not be available at the corners of many homes. In addition, 802.11 MACs do not meet the stringent jitter and latency requirements of video transmission in the home. Although 802.11n solves some of the problems, it is still difficult to completely solve all the problems. Therefore, we need to use wired connection technology to assist WiFi technology to transmit video content throughout the home.
The Coaxial Cable Multimedia Alliance (MoCA) standard uses the coaxial cable already installed in most homes to enable video signal transmission at home. It is assumed that the signal is transmitted from the access point device, and the coaxial cable has a small insertion loss and is hardly interfered by crosstalk, so the coaxial cable is a better medium. However, coaxial cables are not suitable for network technology due to the extremely high loss due to jitter between interfaces. In addition, coaxial cable is not as popular as telephone lines or power lines, so home networking technology using only coaxial cable is still very limited for most homes.
The Home Phoneline Network Alliance (HPNA) is another home networking technology that was originally developed for use on the telephone line. ITU-T has proposed the G.9954 specification for this technology, and the latest HPNA version 3.1 of this technology is also available for coaxial cable. The main advantage of HPNA is that there are more telephone interfaces in the home than coaxial cable interfaces. However, in the case of poor connection and bridging tap conditions, performance degradation sometimes occurs. The insertion loss of the telephone line is greater than that of the coaxial cable. Although the telephone line is curled, it is greatly affected by high frequency crosstalk. In addition, the telephone line is also affected by the sharp noise of other electrical appliances.
The power cord is another important medium for wired connections. Although such wires are not yet widely accepted, some patented technologies are already available. HomePlug is a strong industry consortium that has introduced several standards. The latest standard, HomePlugAV, is designed to support the needs of home video streaming applications and is said to support coaxial cable. In addition, OPERA and CEPCA have also introduced their own patent standards and introduced their products to the market.
The main advantage of power line connections is that most homes have many power line interfaces that provide great flexibility in the transmission of video, voice and data services at home. Unfortunately, the power cord is not curled and is susceptible to crosstalk. The topology of household power lines is complex and can easily cause signal loss. In addition, different appliances can cause a lot of noise.
Typical application of home network
The various wired network technologies vary widely, and it is really confusing. Many different specifications are not only difficult to achieve interoperability, but sometimes interfere with each other. If a user encounters difficulties with a home networking technology, they will be dissatisfied with the service provider that provides the device or technology. There are various technical standards in the market, which increases the cost, makes it difficult for equipment suppliers to achieve economies of scale, and also makes service providers face greater risks. The technology they choose may not be enough. Accepted by the user, forcing it to make a large investment to update the existing equipment.
Promote the establishment of a universal wired home network standard
In view of the above reasons, service providers are actively working to establish a new wired home network standard to achieve high performance of various wired connection media in the home. Why develop new standards instead of improving existing ones? One of the main reasons is that we need a network technology that makes full use of the existing wired connection media in the home, whether it is coaxial cable, telephone line, power line or structured wiring. A unified standard addresses interoperability issues and makes the best use of existing lines.
The International Telecommunication Union (ITU-T) has begun to develop such an up-to-date standard, and a committee of the Alliance (Research Group 15, Working Group 1, 4th Office of Study Group 15, Working Party 1, Question 4) is currently preparing Proposed a unified wired home network standard recommendation, namely G.hn. The committee has proposed DSL and HPNA standards in the past. The G.hn standard is based on Orthogonal Frequency Domain Multiplexing (OFDM), which is also used in 802.11 and several other recent standards. In addition, we hope that the new standard recommendations will achieve higher robustness, meet existing home network cabling requirements, provide strict Quality of Service (QoS) support for reliable video transmission, and avoid existing services in the line. Cause interference between. We also have a requirement for the new standard that it must exceed the capabilities and data transfer speed of the prior art to support next-generation services. The current goal is that the PHY layer data transmission speed should reach 500 Mbps, which means that the MAC layer data transmission speed should be in the range of 200 to 300 Mbps. Finally, service providers expect consumers to have no cumbersome setup steps when doing basic device installations.
ITU-T is currently planning to complete the requirements and basic architecture by June 2007 and finalize the specification recommendations by January 2008. The prototype chipset will be available in late 2008 or early 2009. Integration and interoperability testing will take more time, so the final deployment will begin in late 2009 or early 2010. With the support of the telephone and cable operators, we expect G.hn to become the universal wired connection standard for the WiFi standard.
The role of the home gateway
Home gateways support a variety of home networking technologies.
The current differences in home networking standards and their integration trends further underscore the importance of a new generation of RGs that support video and voice processing and network capabilities. An important function of RG is to route, manage, and ensure bandwidth for multiple HDTV video streams. In addition, RG provides an interface between broadband signals and home networking technologies. RG is very popular in homes with xDSL broadband services and already has a significant market share, and similar devices are expected to play a role in the cable and FTTH markets in the near future. A key advantage of RG is that it provides powerful processing resources, leaves room for new features, and helps service providers deliver differentiated services.
Semiconductor manufacturers are responsive to developing powerful platforms that support high performance, flexibility and service to meet the needs of service providers. Common features include multiprocessors and rich local area network (LAN) interfaces. Multiprocessors dedicated to specific services ensure high system performance and improve quality of service (QoS) for end users.
TI integrates voice capabilities into the RG platform to support multiple home networking technologies such as WiFi, HomePlug and MoCA. We provide interface technology for a variety of home LANs, which allows consumers to choose technology at different price points to ensure that operators are not restricted to a particular LAN technology. If the technology is not accepted by consumers, then the operator's loss will be too big. Finally, the flexible DSP architecture allows us to quickly and inexpensively support new network technologies such as the G.hn standard with the advent of the G.hn standard.
in conclusion
Providing broadcast-quality video and other services in large communities will inevitably require wired connectivity in a short period of time. At present, different wired network technologies are in line and incompatible with each other. The new ITU-T G.hn standard recommendation will solve this problem. The new technology platform will serve as the foundation for the new RG solution, drive the development of next-generation services, and continue to increase flexibility, helping to introduce differentiated services and support new advanced features. This highly flexible new architecture can be easily and inexpensively tuned to deliver more services than consumers, service providers and equipment manufacturers expect. The architecture helps device manufacturers flexibly develop RGs that support multiple home networking technologies, supporting multiple voice calls and other value-added services while delivering multiple HDTV streams. Software and hardware configuration options are easily interchangeable, which will reduce equipment manufacturer development time and provide a powerful platform for service providers to launch new revenue-generating services.
Our company is specialized in supplying Remote Control / Air conditioner remote control / A/C Universal Remote Control
Including air conditioner remote control.LCD display with nice appearance .large code library.menu function and powerful saving mode.Prompt delivery time.power by AAA batteries*2 . good replacement to broken/old remote . It has a powerful codebase and can control most air-conditioners of all brands in the world.It has a memory function during the electricity failure .Also has a function of manually searching (plus or minus) or automatically searching for adaptable type of air-conditioners, which makes it easy and convenient for you to search for a suitable type of air-conditioner.It has complete functions and a comfortable hand feeling, which bring you enjoyment to the maximal extent.
Remote Control
Remote Control,Rf Universal Remote,Universal Remote,Universal Remote Control
ZHEJIANG ICE LOONG ENVIRONMENTAL SCI-TECH CO.,LTD. , https://www.china-refrigerantgas.com