G.hn FAQs



What is G.hn?

G.hn is the common name for a home network technology family of standards developed under the International Telecommunication Union’s Standardization arm (ITU) and promoted by the HomeGrid Forum, and several other organizations. The G.hn specification defines networking over power lines, phone lines and coaxial cables with data rates up to 1 Gbit/s. G.hn is a specification for existing-wire home networking. It is a complementary counterpart to Wi-Fi. G.hn will enable a solution of single-device for any-wire for Home Networking.


What media can be used with G.hn?

G.hn can support different media such as power lines, coaxial cables, and phone lines. In fact, G.hn can be used for any transmission lines that have differential properties, such as flat cable, Ethernet cable, etc.  The signal attenuation may be quite different for different transmission media, resulting in variations of transmission distance and performance.

Can G.hn be used for access networks?

Yes it can. G.hn technology-driven phone line and coaxial cable media can be used for remote access. Multiple carriers and cable operators are in the process of rolling out the services based on the G.hn access technology.


Why is G.hn disruptive to existing wired home networking technologies?

• Able to use all the media available at home
• Not need to re-wire the existing homes
• Higher performance
• Reliable, pervasive connectivity everywhere inside home
• Provides BW and QoS to enable HD video delivery
• Enables end-to-end solution with one silicon


Why did Xingtera choose G.hn?

• The technology threshold for Power Line communication, Copper transmission, and Telephone Wire Communication is very  high, which will block lots of potential “copy cats” from entering the market.
• G.hn will create lots of home applications in the market.
• The IPs Xingtera develop and invent will help Xingtera develop different G.hn based derivative products in a timely and cost effective fashion.
• Huge market potential will help Xingtera generate sustainable revenue growth.


Who will benefit from G.hn?

Because the G.hn standard is aimed to deliver a single unified home networking technology that can run over coax, power lines and phone lines, a range of companies – including service providers, PC manufacturers and CE companies– will benefit. Consumers will also see significant benefits. G.hn enables service providers to deploy new offerings including IPTV more cost effectively; and it allows consumer electronics manufacturers to provide powerful devices for connecting all types of entertainment, home automation, smart energy management and security products throughout the house. Coupled with the HomeGrid certification program, this greatly simplifies consumer purchasing and installation processes.


Why do global tier 1 carriers prefer G.hn?

• Existing Home Networking technologies created fragmented market – Slow Adoption

– Multiple silicon technologies for the same target market→higher solution cost
– Non-interoperability among vendors of the same technology→Slower customer adoption
– Low bandwidth→Not suitable for video
– Media specific→Limited bundling of services→Lower revenue potential for carriers

• ITU-T makes the G.hn a universal standard. From the technical point of view, it is a new version of polished and improved Home Networking solution for PLC/Coax/Phone Line, and it is more suitable for large scale deployment across the whole world


Why is G.hn so hot today?

• Dramatically increased access bandwidth to home by FTTH deployment is creating the urgent demand of efficient Home Networking solutions. G.hn will best serve the market needs due to its higher performance, improved reliability, and better QoS.
• G.hn will enable pervasive video distribution and pervasive connectivity within home
• G.hn is the ultimate solution to achieve convergence of three networks, Internet of things at home and intelligence home management.

Does G.hn compete with WiFi?

As a wired home networking technology, G.hn is complementary to WiFi. Due to severe attenuation of 2.4GHz/5.2GHz RF signals by concrete and brick walls, QoS (Quality of Service) issues, and security concerns experienced by WiFi, an ideal network model is to use G.hn as wired backbone to connect WiFi APs in different rooms whereas a G.hn + WiFi bridge is used to set up WiFi environment within each room. Carriers have been adopting such a G.hn + WiFi bridge solution since G.hn is more advantageous than WiFi in terms of scalability, stability, and performance as the home network backbone.


Does G.hn take long time to mature from technology point of view?

• G.hn is an emerging technology ONLY in the sense that it is a brand new standard that enables single device for three media (Power line/Coax/Phone line) at home. There are some successful deployments based on single medium Home Networking technologies (PLC, MoCA, and HomePNA), but the market is fragmented mainly because of single medium and lacking of Interoperability. G.hn takes advantages of the learning from those technology developments and is maturing much faster than those single media technologies. ITU-T makes the G.hn a universal standard. From the technical point of view, it is a new version of polished and improved Home Networking solution for PLC/Coax/Phone Line, and it is more suitable for large scale deployment across the whole world.

• Today, five silicon vendors, including Xingtera, have or are about to have G.hn silicon. With multiple vendors’ effort, the deployable G.hn silicon products will be available shortly.


Why is G.hn a better standard than HomePlug AV for power line?

The differences between HomePlugAV and G.hn are in both the PHY layer and the MAC layer and networking features. G.hn utilized the latest state-of-the-art networking technology that HPAV lacks due to its legacy technology. There are also several significant improvements on the PHY technology such as LDPC error correction technology in G.hn vs. old Turbo code in HPAV, MAC and Networking technologies, dealing with multicast, broadcast, security, QoS etc., are where G.hn shines brightly.


What is the International Telecommunication Union (ITU)?

The ITU is a global standards body that is under the auspices of the United Nations. Comprising more than 185 member countries, the ITU sets standards for global networks. The ITU’s Telecommunications division (ITU-T) produces more than 200 standards recommendations each year in the converging areas of telecommunications, information technology, consumer electronics, broadcasting and multimedia communications.


What is the ITU-T G.hn effort?

ITU-T G.hn is a next-generation wired home networking technology that enables transmission of video, audio and data over existing coax, phone line and power line wires in the home. The G.hn recommendation consists of three components: G.9960 (PHY), G.9961 (MAC) and G.9972 (coexistence mechanism)


Who performs certification of G.hn products?

HomeGrid Forum and BroadBand Forum collaborate to set a complete certification and interoperability program.


Is G.hn stable under power line environment?

Yes. A lot of practical experience in the industry has proved that the wideband PLC technology is mature and stable. It can support power line environment in different countries / regions and real-time high data-rate multimedia such as IPTV and HDTV.


Will my neighbors’ PLC adapters interfere mine?

Yes. Because all power lines are interconnected, your neighbor’s PLC signals may enter your home environment and therefore cause interference. In most environments, there are a pair of air switches, a pair of electric meters, and a power line of a certain distance between your PLC adapters and your neighbor’s PLC adapters, which could introduce 30 ~ 80dB attenuation. When attenuation is small, the interference between neighbors can cause sharp decline in PLC performance. Fortunately, the problem of crosstalk has been taken into account in the early stage of G.hn development. What is more, NDIM protocol in the standard ensures that the interference will not cause a large impact on the performance within neighborhood.

Is G.hn PLC technology secure?

Yes. All transmitted data in G.hn PLC is encrypted using 128-bit AES technology. It is unlikely that your information will be compromised with the weak signal leakage on power line. This is also a technical advantage of G.hn technology when compared with wireless technology.

Does G.hn comply with EN50561?

G.hn supports EN50561 specified PSD, AR notch standards and etc. To fully comply with EN50561 standard, one needs to take into consideration of a few design factors including the peripheral circuit electromagnetic compatibility requirements, strengthening filtering, and shielding design.